From nobody Mon Jan 3 01:13:35 2022 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 64DBE3A0D26 for ; Mon, 3 Jan 2022 01:13:33 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.099 X-Spam-Level: X-Spam-Status: No, score=-2.099 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=orange.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 5NmBFebJugtk for ; Mon, 3 Jan 2022 01:13:29 -0800 (PST) Received: from relais-inet.orange.com (relais-inet.orange.com [80.12.66.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id BDB123A0D24 for ; Mon, 3 Jan 2022 01:13:28 -0800 (PST) Received: from opfedar07.francetelecom.fr (unknown [xx.xx.xx.9]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by opfedar25.francetelecom.fr (ESMTP service) with ESMTPS id 4JS95c3Vs7z8vGV; Mon, 3 Jan 2022 10:13:24 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=orange.com; s=ORANGE001; t=1641201204; bh=U4bURJj0G9IEKTMZdIi/uaIJqNAaWxPuAIG8DTQaWMg=; h=From:To:Subject:Date:Message-ID:Content-Type: Content-Transfer-Encoding:MIME-Version; b=SyUyyVf5l53/2/YinU1HMtD5bOGzguSoUn/ItQdchyjPbzU9dEmTb3hYORULDuA+Z c6TS5HJwwc+hSq1kXoHmwXyVSypVLKw9kr42RQRGUEcdpNLnYFIcQBm6uaKC0b8flp 0IjglA57vOK5iNoeRJ9lyb0uAe8SComiooc+An3WO6UlrXanJEGqGD/T1geSdHaCAl urPrHjfaU+wfonxKhjCiHuhR6mt/nE/TPwzlN8G0OmI7M5Urzpa9whfgOz4DmwrgIu c/hNXsUY4OJfI4La7WsS+JQahkr3lLHTx1ry9QdXoeqwUHtxJhlIJkoyrFueYz/oGa o3plC38Z+4a8g== Received: from Exchangemail-eme6.itn.ftgroup (unknown [xx.xx.13.76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by opfedar07.francetelecom.fr (ESMTP service) with ESMTPS id 4JS95c2dByz5vNB; Mon, 3 Jan 2022 10:13:24 +0100 (CET) From: To: "Scharf, Michael" CC: "tcpm@ietf.org" Thread-Topic: [tcpm] I-D Action: draft-ietf-tcpm-yang-tcp-04.txt Thread-Index: AQHXyc25qfTSowdLSEa6dKhesfqRYKv/uF0AgEvBUuCABenxUA== Content-Class: Date: Mon, 3 Jan 2022 09:13:23 +0000 Message-ID: <3337_1641201204_61D2BE34_3337_132_1_787AE7BB302AE849A7480A190F8B93303546BDC5@OPEXCAUBMA2.corporate.adroot.infra.ftgroup> References: <163518613944.7645.2494692847367626249@ietfa.amsl.com> <18622_1636712195_618E3F03_18622_35_1_787AE7BB302AE849A7480A190F8B933035450859@OPEXCAUBMA2.corporate.adroot.infra.ftgroup> In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: msip_labels: MSIP_Label_07222825-62ea-40f3-96b5-5375c07996e2_Enabled=true; MSIP_Label_07222825-62ea-40f3-96b5-5375c07996e2_SetDate=2022-01-03T08:26:45Z; MSIP_Label_07222825-62ea-40f3-96b5-5375c07996e2_Method=Privileged; MSIP_Label_07222825-62ea-40f3-96b5-5375c07996e2_Name=unrestricted_parent.2; MSIP_Label_07222825-62ea-40f3-96b5-5375c07996e2_SiteId=90c7a20a-f34b-40bf-bc48-b9253b6f5d20; MSIP_Label_07222825-62ea-40f3-96b5-5375c07996e2_ActionId=49c250bb-949e-4569-b0b4-01c9d91c8976; MSIP_Label_07222825-62ea-40f3-96b5-5375c07996e2_ContentBits=0 x-originating-ip: [10.114.13.245] Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Archived-At: Subject: Re: [tcpm] I-D Action: draft-ietf-tcpm-yang-tcp-04.txt X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 03 Jan 2022 09:13:33 -0000 Hi Michael,=20 The changes look good. Thank you.=20 Please find below some comments on the new version:=20 - Section 4 (1) OLD:=20 reference "RFC XXXX, YANG Model for Transmission Control Protocol (TCP) Configuration."; NEW: reference "RFC XXXX: A YANG Model for Transmission Control Protocol (TCP) Configuration"; (2) Add "when set to true" in the description of almost all the Boolean nodes.= =20 (3) I still don't think "forms the connection identifier" is accurate. The conn= ection is identified by the 4-uple (which is captured in the key statement)= . You may consider simply: s/forms the connection identifier/of the connect= ion. Another better approach would be, e.g.:=20 OLD:=20 "Local address that forms the connection identifier."; NEW: "Identifies the address that is used locally by an endpoint to bind the co= nnection."; OLD:=20 "Remote address that forms the connection identifier."; NEW: "Identifies the address that is used by the peer endpoint to bind the conn= ection."; etc.=20 - Make this change in 5.2: s/registrations are requested/registration is re= quested - Update 5.2 to make it explicit that the module is not maintained by IANA:= =20 OLD: name: ietf-tcp namespace: urn:ietf:params:xml:ns:yang:ietf-tcp prefix: tcp reference: RFC XXXX NEW: name: ietf-tcp namespace: urn:ietf:params:xml:ns:yang:ietf-tcp prefix: tcp maintained by IANA: N reference: RFC XXXX=20 - I think you can remove the note in B.1 - remove "\" right after "" in B.2 - As you are referring to RFC 8792, you need to add the 8792 header to adhe= re with the following (B.2): =3D=3D=3D=3D=3D=3D ... Text content that has been folded as specified by this strategy MUST adhere to the following structure. 7.1.1. Header The header is two lines long. The first line is the following 36-character string; this string MAY be surrounded by any number of printable characters. This first line cannot itself be folded. NOTE: '\' line wrapping per RFC 8792 The second line is an empty line, containing only the end-of-line character sequence. This line provides visual separation for readability. =3D=3D=3D=3D=3D - B.2: Not sure why this I-D is cited here given the example does not echo an exam= ple from that I-D (e.g., same local/remote port, local address, etc.). Also= , I was expecting to see an example that illustrates the use of send-id and= recv-id. If the citation is maintained, please make this change:=20 s/demonstrated by examples in draft-touch-tcpm-ao-test-vectors/demonstrated= by examples in I-D.ietf-tcpm-ao-test-vectors Cheers, Med > -----Message d'origine----- > De=A0: Scharf, Michael > Envoy=E9=A0: jeudi 30 d=E9cembre 2021 15:19 > =C0=A0: BOUCADAIR Mohamed INNOV/NET > Cc=A0: tcpm@ietf.org > Objet=A0: RE: [tcpm] I-D Action: draft-ietf-tcpm-yang-tcp-04.txt >=20 > Hi Med, >=20 > Thanks a lot for the detailed review. I went through all your comments. > Most were straightforward to address. >=20 > Our suggestion is to clearly state that MPTCP is outside the scope of this > model. MPTCP may need a different YANG model. Yet, the most obvious use > case of the YANG model are TCP-based control plane protocols on routers > (BGP, LDP, ...). At least I am not aware of widespread use of BGP over > MPTCP. >=20 > Can you please have a look at -05 and let me know if -05 works for you? >=20 > The full diff is available at: https://www.ietf.org/rfcdiff?url2=3Ddraft- > ietf-tcpm-yang-tcp-05 >=20 > Thanks >=20 > Michael >=20 > > -----Original Message----- > > From: mohamed.boucadair@orange.com > > > > Sent: Friday, November 12, 2021 11:17 AM > > To: Scharf, Michael > > Cc: tcpm@ietf.org > > Subject: RE: [tcpm] I-D Action: draft-ietf-tcpm-yang-tcp-04.txt > > > > Hi Michael, > > > > FWIW, please find below some comments to the latest version of the > draft: > > > > * pdf: https://raw.githubusercontent.com/boucadair/IETF-Drafts- > > Reviews/master/draft-ietf-tcpm-yang-tcp-04-rev%20Med.pdf > > * doc: https://github.com/boucadair/IETF-Drafts- > > Reviews/raw/master/draft-ietf-tcpm-yang-tcp-04-rev%20Med.doc > > > > I think that the document is almost stable. Thank you. > > > > Cheers, > > Med > > > > > -----Message d'origine----- > > > De=A0: tcpm De la part de > > > internet-drafts@ietf.org Envoy=E9=A0: lundi 25 octobre 2021 20:22 =C0= =A0: > > > i-d-announce@ietf.org Cc=A0: tcpm@ietf.org Objet=A0: [tcpm] I-D Actio= n: > > > draft-ietf-tcpm-yang-tcp-04.txt > > > > > > > > > A New Internet-Draft is available from the on-line Internet-Drafts > > > directories. > > > This draft is a work item of the TCP Maintenance and Minor > > > Extensions WG of the IETF. > > > > > > Title : YANG Model for Transmission Control Protocol > > > (TCP) Configuration > > > Authors : Michael Scharf > > > Mahesh Jethanandani > > > Vishal Murgai > > > Filename : draft-ietf-tcpm-yang-tcp-04.txt > > > Pages : 23 > > > Date : 2021-10-25 > > > > > > Abstract: > > > This document specifies a minimal YANG model for TCP on devices > that > > > are configured by network management protocols. The YANG model > > > defines a container for all TCP connections and groupings of > > > authentication parameters that can be imported and used in TCP > > > implementations or by other models that need to configure TCP > > > parameters. The model also includes basic TCP statistics. The > model > > > is NMDA (RFC 8342) compliant. > > > > > > > > > The IETF datatracker status page for this draft is: > > > https://datatracker.ietf.org/doc/draft-ietf-tcpm-yang-tcp/ > > > > > > There is also an htmlized version available at: > > > https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-yang-tcp-04 > > > > > > A diff from the previous version is available at: > > > https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-tcpm-yang-tcp-04 > > > > > > > > > Internet-Drafts are also available by anonymous FTP at: > > > ftp://ftp.ietf.org/internet-drafts/ > > > > > > > > > _______________________________________________ > > > tcpm mailing list > > > tcpm@ietf.org > > > https://www.ietf.org/mailman/listinfo/tcpm > > > > __________________________________________________________ > > __________________________________________________________ > > _____ > > > > Ce message et ses pieces jointes peuvent contenir des informations > > confidentielles ou privilegiees et ne doivent donc pas etre diffuses, > > exploites ou copies sans autorisation. Si vous avez recu ce message > > par erreur, veuillez le signaler a l'expediteur et le detruire ainsi > > que les pieces jointes. Les messages electroniques etant susceptibles > > d'alteration, Orange decline toute responsabilite si ce message a ete > > altere, deforme ou falsifie. Merci. > > > > This message and its attachments may contain confidential or > > privileged information that may be protected by law; they should not > > be distributed, used or copied without authorisation. > > If you have received this email in error, please notify the sender and > > delete this message and its attachments. > > As emails may be altered, Orange is not liable for messages that have > > been modified, changed or falsified. > > Thank you. ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. From nobody Mon Jan 3 01:22:53 2022 Return-Path: X-Original-To: tcpm@ietf.org Delivered-To: tcpm@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id EF7A23A0D7B; Mon, 3 Jan 2022 01:22:43 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: IETF Meeting Session Request Tool To: Cc: martin.h.duke@gmail.com, nsd.ietf@gmail.com, tcpm-chairs@ietf.org, tcpm@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.41.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <164120176395.21867.3530199896859049931@ietfa.amsl.com> Date: Mon, 03 Jan 2022 01:22:43 -0800 Archived-At: Subject: [tcpm] tcpm - New Meeting Session Request for IETF 113 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 03 Jan 2022 09:22:51 -0000 A new meeting session request has just been submitted by Yoshifumi Nishida, a Chair of the tcpm working group. --------------------------------------------------------- Working Group Name: TCP Maintenance and Minor Extensions Area Name: Transport Area Session Requester: Yoshifumi Nishida Number of Sessions: 1 Length of Session(s): unspecified Number of Attendees: 60 Conflicts to Avoid: Technology overlap: masque panrg iccrg tsvarea taps quic tsvwg Key participant conflict: idr netconf People who must be present: Yoshifumi Nishida Michael Tuexen Martin Duke Michael Scharf Resources Requested: Special Requests: --------------------------------------------------------- From nobody Tue Jan 4 10:03:06 2022 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2457F3A08B0; Mon, 3 Jan 2022 09:02:33 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO 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BL0PR1901MB2019 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.425, 18.0.790 definitions=2022-01-03_06:2022-01-01, 2022-01-03 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 priorityscore=1501 lowpriorityscore=0 clxscore=1011 phishscore=0 impostorscore=0 spamscore=0 bulkscore=0 mlxlogscore=999 mlxscore=0 suspectscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2201030115 X-Proofpoint-GUID: xj5WSWBAEseM8P8JyB1IXj7D1lkE_vfo X-Proofpoint-ORIG-GUID: xj5WSWBAEseM8P8JyB1IXj7D1lkE_vfo X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 phishscore=0 mlxlogscore=999 adultscore=0 bulkscore=0 malwarescore=0 mlxscore=0 spamscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2201030116 Archived-At: X-Mailman-Approved-At: Tue, 04 Jan 2022 10:03:04 -0800 Subject: Re: [tcpm] [Technical Errata 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ICA6IFMuIEZsb3lkLCBULiBIZW5kZXJzb24sIEEuIEd1cnRvdg0KQ2F0ZWdvcnkgICAgICAgICAg ICA6IFBST1BPU0VEIFNUQU5EQVJEDQpTb3VyY2UgICAgICAgICAgICAgIDogVHJhbnNwb3J0IEFy ZWEgV29ya2luZyBHcm91cA0KQXJlYSAgICAgICAgICAgICAgICA6IFRyYW5zcG9ydA0KU3RyZWFt ICAgICAgICAgICAgICA6IElFVEYNClZlcmlmeWluZyBQYXJ0eSAgICAgOiBJRVNHDQo= From nobody Tue Jan 4 10:26:12 2022 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B6A883A03F6 for ; Tue, 4 Jan 2022 10:26:09 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6w3w4regwKJa for ; Tue, 4 Jan 2022 10:26:05 -0800 (PST) Received: from mail-qt1-x82f.google.com (mail-qt1-x82f.google.com [IPv6:2607:f8b0:4864:20::82f]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 255843A03ED for ; Tue, 4 Jan 2022 10:26:05 -0800 (PST) Received: by mail-qt1-x82f.google.com with SMTP id z9so34960978qtj.9 for ; Tue, 04 Jan 2022 10:26:05 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:from:date:message-id:subject:to; bh=SzD+wndoOqZGPjImzytiGiFbqWPX1KJPY+AU+pnTMos=; b=ERPZ9IJZy1Bc+KE7viN1zRvsWTa5FjQGNyQG/IxyvP60oDcnKqqO2PGui56VcpikB/ Y5YDwBru1FaJibqIiJ1wMGkrBqGmCUDFquuzktWz41a3SiRQ4uaXyMZ9e7nvYlp3fRB4 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ABdhPJzvJIh81v//MzC8k/hVgPwwjOSrO+eshsIQpW5o+ivkycidcXoGg+MhxnoILwoU4VvGzxVFRp5rdrGZnOC8ZxQ= X-Received: by 2002:a05:622a:1191:: with SMTP id m17mr45301208qtk.595.1641320762942; Tue, 04 Jan 2022 10:26:02 -0800 (PST) MIME-Version: 1.0 From: Yoshifumi Nishida Date: Tue, 4 Jan 2022 10:25:52 -0800 Message-ID: To: "tcpm@ietf.org Extensions" Content-Type: multipart/alternative; boundary="00000000000009aa7805d4c5c599" Archived-At: Subject: [tcpm] WGLC for draft-ietf-tcpm-yang-tcp-05 X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 04 Jan 2022 18:26:10 -0000 --00000000000009aa7805d4c5c599 Content-Type: text/plain; charset="UTF-8" Hello folks, As the doc is mostly stable while there seems to be on-going discussions, we've decided to initiate a WGLC for draft-ietf-tcpm-yang-tcp-05 Please send your feedback to the ML. The WGLC runs until *Jan 25*. The URL for the doc is https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-yang-tcp-05 We appreciate your cooperation! -- tcpm co-chairs --00000000000009aa7805d4c5c599 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hello folks,

As the doc is mostly stable while there seems = to be on-going discussions,=C2=A0we've decided to=C2=A0initiate=C2=A0a=C2=A0WGLC=C2=A0for=C2=A0draft-ietf-tcpm-yan= g-tcp-05
Please send your fe= edback to the ML.
The=C2=A0WGLC=C2=A0runs until *Jan 25*.= =C2=A0

The URL for the doc is=C2=A0https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-yang-tcp-05
We appreciate yo= ur cooperation!
--
tcpm co-chair= s
--00000000000009aa7805d4c5c599-- From nobody Wed Jan 5 01:39:42 2022 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CEDAF3A0B35; Wed, 5 Jan 2022 01:32:53 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0yPr0JtDUOgN; Wed, 5 Jan 2022 01:32:49 -0800 (PST) Received: from mail-qk1-x734.google.com (mail-qk1-x734.google.com [IPv6:2607:f8b0:4864:20::734]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id AFB0A3A0B31; Wed, 5 Jan 2022 01:32:49 -0800 (PST) Received: by mail-qk1-x734.google.com with SMTP id m2so36014011qkd.8; Wed, 05 Jan 2022 01:32:49 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=WuOjhp50r+e9Cs57lBcdlHEPn5UGXXDST3kpYcM/sp0=; b=h5MNxtrHaX+DaVm9fcQ3gmBv8iGPRTZ7cRF3lMb2RQKJf1wysp0wMzpMRVQjmjjjQ8 +S7+X4MhOxjz5QL6bAK7RReEF0On7F69IsLuPeUUQEH3f/bq0O4eMOvTeAS27jkvatkt 9oIo3nW9Of4ljcd4hfnSDvRwml0yZbQOCdF2Vn4+4k9+hoaPX2chGFsVH0GZWxmuz6xq 6JFDorg081kBRTi3YvlvldV2aS60y90PN+dFXqC5NkEPFdt6+c3n1ie1WsWR9Zr0R/2I HgLozGE0TYLuD70mijJJGlWCVfRgQaN8C6E+IV3UIDbkYXEabV80nEny45p7kIVFsFtn ntLA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=WuOjhp50r+e9Cs57lBcdlHEPn5UGXXDST3kpYcM/sp0=; b=SPpp9WzUBgMuKJ7JyXGbluMBYq6ASYbVbRM6b6D4v0odRxcCiT6QmJyawJQT07ZZ0w mcs+s+gTaISghDavCZ4DtqHyvflO8T8acRR2YlnNEWwekm4H5gi+2GQJ1gRAmQ4V/IRB oqcy3LN2GtfD50G7WepJoern2Ff42hbvq/H1HdSUDDLlzV+kfm50b2Ncaw4R8hojiz69 stXRDRwRSkPzaiz8uJxzr/BHAqocEnmiinUIhUgZ1R4AVRQwgjNdMqLny/1EgE140l8w jSqEVRbF4d1kLYr7St9G7qCsW2RFqa+aCDosqJyupm7oZ/1Egt8djGz2CF6P0dSFfJl4 kwvQ== X-Gm-Message-State: AOAM530KLyhIPuDlhcXKyQ07aJv+4B6DWZ+r1tbo0PzX13yVCV34V9Um pL9RC009K24QZXvlbn+fuPQe+l3hC+8R2VRSzsI= X-Google-Smtp-Source: ABdhPJxaq/N5v410CbwrSeOrNKam6oBxYwvAcjaWf0wpJIYIMYI+nylaa98x0KEhOAP8LLTfpECXFJ9caEZJ4eHk3KU= X-Received: by 2002:ae9:ed96:: with SMTP id c144mr234426qkg.306.1641375168099; Wed, 05 Jan 2022 01:32:48 -0800 (PST) MIME-Version: 1.0 References: <20211219081501.6A08C214B58@rfc-editor.org> In-Reply-To: From: Yoshifumi Nishida Date: Wed, 5 Jan 2022 01:32:37 -0800 Message-ID: To: "Black, David" Cc: RFC Errata System , "floyd@acm.org" , "thomas.r.henderson@boeing.com" , "andrei.gurtov@teliasonera.com" , "martin.h.duke@gmail.com" , "Zaheduzzaman.Sarker@ericsson.com" , "gorry@erg.abdn.ac.uk" , "wes@mti-systems.com" , "tcpm@ietf.org" , "tsvwg@ietf.org" , "q645v49v@anonaddy.me" Content-Type: multipart/alternative; boundary="000000000000d6785105d4d26fa0" Archived-At: X-Mailman-Approved-At: Wed, 05 Jan 2022 01:39:41 -0800 Subject: Re: [tcpm] [tsvwg] [Technical Errata Reported] RFC3782 (6789) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 05 Jan 2022 09:32:54 -0000 --000000000000d6785105d4d26fa0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable I personally think the errata looks correct, but I would like to see if there're other opinions. But, in any case, it should be for RFC6582 rather than for RFC3782. -- Yoshi On Mon, Jan 3, 2022 at 9:02 AM Black, David wrote: > +tcpm, Thanks, --David > > -----Original Message----- > From: RFC Errata System > Sent: Sunday, December 19, 2021 3:15 AM > To: floyd@acm.org; thomas.r.henderson@boeing.com; > andrei.gurtov@teliasonera.com; martin.h.duke@gmail.com; > Zaheduzzaman.Sarker@ericsson.com; Black, David; gorry@erg.abdn.ac.uk; > wes@mti-systems.com > Cc: q645v49v@anonaddy.me; tsvwg@ietf.org; rfc-editor@rfc-editor.org > Subject: [Technical Errata Reported] RFC3782 (6789) > > > [EXTERNAL EMAIL] > > The following errata report has been submitted for RFC3782, > "The NewReno Modification to TCP's Fast Recovery Algorithm". > > -------------------------------------- > You may review the report below and at: > > https://urldefense.com/v3/__https://www.rfc-editor.org/errata/eid6789__;!= !LpKI!xxWA_mawfGxDiokgZx4JlYDNW_ZS26fWQiKHj4sSE9uTS0HGa1KsqyaqZqDwU0qQ$ > [rfc-editor[.]org] > > -------------------------------------- > Type: Technical > Reported by: Clive Bloom > > Section: 6.1 > > Original Text > ------------- > If the Cumulative Acknowledgement field didn=E2=80=99t cover more than > "recover", check to see if the congestion window is greater than > SMSS bytes and the difference between highest_ack and > prev_highest_ack is at most 4*SMSS bytes. If true, duplicate > ACKs indicate a lost segment (proceed to Step 1A in Section 3). > Otherwise, duplicate ACKs likely result from unnecessary > retransmissions (proceed to Step 1B in Section 3). > > Corrected Text > -------------- > If the Cumulative Acknowledgement field didn=E2=80=99t cover more than > "recover", check to see if the congestion window is greater than > SMSS bytes and the difference between highest_ack and > prev_highest_ack is at most 3*SMSS bytes. If true, duplicate > ACKs indicate a lost segment (proceed to Step 1A in Section 3). > Otherwise, duplicate ACKs likely result from unnecessary > retransmissions (proceed to Step 1B in Section 3). > > Notes > ----- > RFC3782 references to Gur03 and GF04 papers as to the initial sources > of the heuristics both ACK-based and Timestamp-based. Neither of those > papers nor Gur03 nor GF04 defines difference between highest_ack and > previous_highest_ack > of at least 4*SMSS bytes upon receiving the third duplicate ACK as an > indication > of droped retransmitted segment. Instead, section III of GF04 says: > > "The acknowledgment heuristic is based on an observation that if the > TCP sender unnecessarily retransmits at least three adjacent packets, > there will be a jump by at least four segments in a cumulative > acknowledgment field. The sender will have correctly retransmitted at lea= st > one packet, to advance the cumulative acknowledgment field, and > unnecessarily retransmitted at least three more to result in three > duplicate > acknowledgments. Following the advancement of the cumulative acknowledgme= nt > field, the sender stores the value of the previous cumulative > acknowledgment > as prev_highest_ack and stores the latest cumulative acknowledgment as > highest_ack. Upon receiving the third duplicate acknowledgment, > the sender invokes a Fast Retransmit if its congestion window is greater > than one MSS (Maximum Segment Size), and the difference between highest_a= ck > and prev_highest_ack is at most three MSS." > > According to GF04 if TCP sender in absence of any droped acknowledgments > upon receiving > the third duplicate ACK has difference between highest_ack and > prev_highest ack values > of at most/i.e. no more than 3*SMSS bytes then this is explicite > indication of droped retransmitted > segment and leads TCP sender to invoke Fast Retransmit, but current > description of ACK-based > heuristic in RFC3782 section 6.1 in part of: "if the congestion window is > greater than > SMSS bytes and the difference between highest_ack and > prev_highest_ack is at most 4*SMSS bytes. If true, duplicate > ACKs indicate a lost segment (proceed to Step 1A in Section 3)", makes TC= P > sender to treat > difference between highest_ack and prev_highest_ack of 4SMSS bytes upon > receiving 3rd > duplicate ACK as indication of lost retransmitted segment but again > according to GF04 this is NOT so, > and makes TCP sender to invoke Fast Retransmit when in fact those three > duplicate acknowledgments > indicate unnecessarily retransmitted segments and have in their > acknowledgment fields sequence > number which receiver expects to receive next but which sender has NOT > sent yet, so Fast Retransmit > has no point in this case. > > Instructions: > ------------- > This erratum is currently posted as "Reported". If necessary, please > use "Reply All" to discuss whether it should be verified or > rejected. When a decision is reached, the verifying party > can log in to change the status and edit the report, if necessary. > > -------------------------------------- > RFC3782 (draft-ietf-tsvwg-newreno-02) > -------------------------------------- > Title : The NewReno Modification to TCP's Fast Recovery > Algorithm > Publication Date : April 2004 > Author(s) : S. Floyd, T. Henderson, A. Gurtov > Category : PROPOSED STANDARD > Source : Transport Area Working Group > Area : Transport > Stream : IETF > Verifying Party : IESG > --000000000000d6785105d4d26fa0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
I personally think the errata looks correct, but I wo= uld like to see if there're other=C2=A0opinions.
But, in = any case, it should be for RFC6582 rather than for RFC3782.
--
Yoshi

On Mon, Jan 3, 2022 at 9:02 AM Black, David <David.Black@dell.com> wrote:
+tcpm, Thanks, --D= avid

-----Original Message-----
From: RFC Errata System <rfc-editor@rfc-editor.org>
Sent: Sunday, December 19, 2021 3:15 AM
To: floyd@acm.org; <= a href=3D"mailto:thomas.r.henderson@boeing.com" target=3D"_blank">thomas.r.= henderson@boeing.com; andrei.gurtov@teliasonera.com; martin.h.duke@gmail.com; Zaheduzzaman= .Sarker@ericsson.com; Black, David; gorry@erg.abdn.ac.uk; wes@mti-systems.com
Cc: q645v49v@anon= addy.me; tsvwg@ietf= .org; rf= c-editor@rfc-editor.org
Subject: [Technical Errata Reported] RFC3782 (6789)


[EXTERNAL EMAIL]

The following errata report has been submitted for RFC3782,
"The NewReno Modification to TCP's Fast Recovery Algorithm".<= br>
--------------------------------------
You may review the report below and at:
https://urldefense.com/v3/__htt= ps://www.rfc-editor.org/errata/eid6789__;!!LpKI!xxWA_mawfGxDiokgZx4JlYDNW_Z= S26fWQiKHj4sSE9uTS0HGa1KsqyaqZqDwU0qQ$ [rfc-editor[.]org]

--------------------------------------
Type: Technical
Reported by: Clive Bloom <q645v49v@anonaddy.me>

Section: 6.1

Original Text
-------------
If the Cumulative Acknowledgement field didn=E2=80=99t cover more than
"recover", check to see if the congestion window is greater than<= br> SMSS bytes and the difference between highest_ack and
prev_highest_ack is at most 4*SMSS bytes. If true, duplicate
ACKs indicate a lost segment (proceed to Step 1A in Section 3).
Otherwise, duplicate ACKs likely result from unnecessary
retransmissions (proceed to Step 1B in Section 3).

Corrected Text
--------------
If the Cumulative Acknowledgement field didn=E2=80=99t cover more than
"recover", check to see if the congestion window is greater than<= br> SMSS bytes and the difference between highest_ack and
prev_highest_ack is at most 3*SMSS bytes. If true, duplicate
ACKs indicate a lost segment (proceed to Step 1A in Section 3).
Otherwise, duplicate ACKs likely result from unnecessary
retransmissions (proceed to Step 1B in Section 3).

Notes
-----
RFC3782 references to Gur03 and GF04 papers as to the initial sources
of the heuristics both ACK-based and Timestamp-based. Neither of those
papers nor Gur03 nor GF04 defines difference between highest_ack and previo= us_highest_ack
of at least 4*SMSS bytes upon receiving the third duplicate ACK as an indic= ation
of droped retransmitted segment. Instead, section III of GF04 says:

"The acknowledgment heuristic is based on an observation that if the <= br> TCP sender unnecessarily retransmits at least three adjacent packets,
there will be a jump by at least four segments in a cumulative
acknowledgment field. The sender will have correctly retransmitted at least=
one packet, to advance the cumulative acknowledgment field, and
unnecessarily retransmitted at least three more to result in three duplicat= e
acknowledgments. Following the advancement of the cumulative acknowledgment=
field, the sender stores the value of the previous cumulative acknowledgmen= t
as prev_highest_ack and stores the latest cumulative acknowledgment as
highest_ack. Upon receiving the third duplicate acknowledgment,
the sender invokes a Fast Retransmit if its congestion window is greater than one MSS (Maximum Segment Size), and the difference between highest_ack=
and prev_highest_ack is at most three MSS."

According to GF04 if TCP sender in absence of any droped acknowledgments up= on receiving
the third duplicate ACK has difference between highest_ack and prev_highest= ack values
of at most/i.e. no more than 3*SMSS bytes then this is explicite indication= of droped retransmitted
segment and leads TCP sender to invoke Fast Retransmit, but current descrip= tion of ACK-based
heuristic in RFC3782 section 6.1 in part of: "if the congestion window= is greater than
SMSS bytes and the difference between highest_ack and
prev_highest_ack is at most 4*SMSS bytes. If true, duplicate
ACKs indicate a lost segment (proceed to Step 1A in Section 3)", makes= TCP sender to treat
difference between highest_ack and prev_highest_ack of 4SMSS bytes upon rec= eiving 3rd
duplicate ACK as indication of lost retransmitted segment but again accordi= ng to GF04 this is NOT so,
and makes TCP sender to invoke Fast Retransmit when in fact those three dup= licate acknowledgments
indicate unnecessarily retransmitted segments and have in their acknowledgm= ent fields sequence
number which receiver expects to receive next but which sender has NOT sent= yet, so Fast Retransmit
has no point in this case.

Instructions:
-------------
This erratum is currently posted as "Reported". If necessary, ple= ase
use "Reply All" to discuss whether it should be verified or
rejected. When a decision is reached, the verifying party=C2=A0
can log in to change the status and edit the report, if necessary.

--------------------------------------
RFC3782 (draft-ietf-tsvwg-newreno-02)
--------------------------------------
Title=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0: The NewReno M= odification to TCP's Fast Recovery Algorithm
Publication Date=C2=A0 =C2=A0 : April 2004
Author(s)=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0: S. Floyd, T. Henderson,= A. Gurtov
Category=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 : PROPOSED STANDARD
Source=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 : Transport Area Wor= king Group
Area=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 : Transport
Stream=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 : IETF
Verifying Party=C2=A0 =C2=A0 =C2=A0: IESG
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X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 06 Jan 2022 02:08:17 -0000 --_000_CO1PR00MB13244BCA19541DB6AC1BC872C34C9CO1PR00MB1324namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Neal, Thanks for the review and sorry for the delay! 1. Our Hystart++ implementation actually does (b) and the draft intends (b)= too. >> Normally when I read that a sequence number X "is ACKed" I think of the = (b) case, i.e. SND.UNA >=3D X. I am somewhat confused by this because SND.UNA means the first byte of data= that has not been ACKed. If it equals X, then X has not been ACKed yet. We tried (a) in the past and we had issues with it. With ACK compression, i= t's common (at least for Windows) to see only 1 or a few ACKs for a whole w= indow of packets especially in the first couple of RTT rounds. In this case= , a round will very likely last for 2 RTT rounds (when it's waiting for the= only ACK for the next window worth of data.) We are not happy with (b) either. We set windowEnd to SndNxt when a round e= nds but SndNxt was updated by the previous ACK that triggered new data, whi= ch means the ACK that covers windowEnd (AckNo >=3D windowEnd) might come in= anytime leading to marking rounds inaccurately. We have been experimenting with a new method to mark rounds- set windowEnd = to SndUna + min(CWnd, advertised window from the peer) when a round ends. W= e have been using it in LEDBAT++ already and rounds are aligned with RTTs m= ore consistently. How does this sound? 2. We have not done any targeted testing of app-limited scenarios unfortuna= tely. Our implementation does assume that the end of a previous round is th= e start of next round. I understand the situation you described where the n= ext round might actually start a few days later and we will be comparing cu= rrent round's minRTT with a stale last round's minRTT. One mitigation for t= his issue would be to clear last round's minRTT when idle is detected. E.g.= if the time diff between two consecutive rounds is greater than a threshol= d, we skip the current round. 3. I agree it's not true in app-limited scenarios and we should remove it. Thanks, Yi ________________________________ From: Neal Cardwell Sent: Monday, November 29, 2021 3:23 PM To: Praveen Balasubramanian ; draft-ietf-tcpm-hystartp= lusplus@ietf.org Cc: tcpm Subject: [EXTERNAL] apparent ambiguities in draft spec for Hystart++ window= start/end? Hi, Thanks again for the nice Hystart++ draft! Below are three quick comments about what AFAICT are some ambiguities about= the spec for detecting and handling window starts/ends, plus a suggestion = for wording that section: (1) Currently, the draft at: https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-hystartplusplus#sec= tion-4.2 says: When windowEnd is ACKed, the current round ends and windowEnd is set to SND.NXT IMHO this is a bit ambiguous as to whether it means: (a) if (SND.UNA > windowEnd) or (b) if (SND.UNA >=3D windowEnd) Normally when I read that a sequence number X "is ACKed" I think of the (b)= case, i.e. SND.UNA >=3D X. But for application-limited flights of data, I = think that (b) interpretation would lead to the Hystart++ logic for the sta= rt/end of rounds potentially being executed twice for each flight of data: = once for the first segment in the flight, and once for the last segment in = the flight (because while processing ACKs for an application-limited flight= the value of SND.NXT may not change). So I imagine the Hystart++ algorithm actually intends the (a) semantics. Th= e (a) approach is what Linux TCP CUBIC Hystart does, and the AFAICT (a) se= mantics give the correct once-per-round behavior even for application-limit= ed flights. I think it would be good to express that aspect of the algorith= m more precisely to indicate the approach that is intended. (2) A second, related, issue: for per-round behavior section 4.2 of the alg= orithm specifies how to detect the end of a round ("When windowEnd is ACKed= , the current round ends"), but only specifies what action is to be taken a= t the start of a round ("At the start of each round during standard slow st= art ([RFC5681]) and CSS:"). I suppose the text is implicitly considering that the start of one round is= the same as the end of the previous round. For bulk data that assumption m= ight be acceptable; it might be fine to think of the start of one round as = the same as the end of the previous round. But for application-limited flig= hts of data that assumption does not hold, and the start of a round and end= of a round are very different events with very different timing and charac= teristics. So for the common case of application-limited flights of data cu= rrently the draft does not specify how to detect the "start of each round" = event that triggers the per-round actions; it only defines how to detect th= e "end" of a round. (3) A third, related, issue: the text in section 4.2 says: A round is chosen to be approximately the Round-Trip Time (RTT). For application-limited flights this text is a poor or confusing fit. For a= pplication-limited flights, the duration of time between two successive ro= unds, aka the length of a round (IMHO), can be arbitrarily long; it can be = much longer than the RTT and perhaps hours or even days. I would suggest ju= st dropping that sentence, to avoid confusion. --- (a suggestion): To clear up these ambiguities I would suggest tweaking the existing text fr= om: (before): """ A round is chosen to be approximately the Round-Trip Time (RTT). We recommend that rounds be measured using sequence numbers. Round can be approximated using sequence numbers as follows: Define windowEnd as a sequence number initialize to SND.UNA When windowEnd is ACKed, the current round ends and windowEnd is set to SND.NXT At the start of each round during standard slow start ([RFC5681]) and CSS: """ ...to be something more like the following: (after): """ Hystart++ measures rounds using sequence numbers, as follows: Define windowEnd as a sequence number initialized to SND.UNA. Upon receiving an ACK, if (SND.UNA > windowEnd) then a new round has started and the sender sets windowEnd to SND.NXT. At the start of each new round during standard slow start ([RFC5681]) and CSS: """ best regards, neal --_000_CO1PR00MB13244BCA19541DB6AC1BC872C34C9CO1PR00MB1324namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
Hi Neal,

Thanks for the review and sorry for the delay!
 
1. Our Hystart++ implementation actually does (b) and the draft intend= s (b) too.
>> Normally when I read that a sequence number X "is ACKed&= quot; I think of the (b) case, i.e. SND.UNA >=3D X.
I am somewhat confused by this because SND.UNA means the first byte of= data that has not been ACKed. If it equals X, then X has not been ACKed ye= t.

We tried (a) in the past and we had issues with it. With ACK compressi= on, it's common (at least for Windows) to see only 1 or a few ACKs for a wh= ole window of packets especially in the first couple of RTT rounds. In this= case, a round will very likely last for 2 RTT rounds (when it's waiting for the only ACK for the next win= dow worth of data.)

We are not happy with (b) either. We set windowEnd to SndNxt when a ro= und ends but SndNxt was updated by the previous ACK that triggered new data= , which means the ACK that covers windowEnd (AckNo >=3D windowEnd) might= come in anytime leading to marking rounds inaccurately.

We have been experimenting with a new method to mark rounds- set windo= wEnd to SndUna + min(CWnd, advertised window from the peer) when a round en= ds. We have been using it in LEDBAT++ already and rounds are aligned with R= TTs more consistently. How does this sound?

2. We have not done any targeted testing of app-limited scenarios unfo= rtunately. Our implementation does assume that the end of a previous round = is the start of next round. I understand the situation you described where = the next round might actually start a few days later and we will be comparing current round's minRTT with a st= ale last round's minRTT. One mitigation for this issue would be to clear la= st round's minRTT when idle is detected. E.g. if the time diff between two = consecutive rounds is greater than a threshold, we skip the current round.

3. I agree it's not true in app-limited scenarios and we should remove it.<= br>

Thanks,

Yi
From: Neal Cardwell <nca= rdwell@google.com>
Sent: Monday, November 29, 2021 3:23 PM
To: Praveen Balasubramanian <pravb@microsoft.com>; draft-ietf-= tcpm-hystartplusplus@ietf.org <draft-ietf-tcpm-hystartplusplus@ietf.org&= gt;
Cc: tcpm <tcpm@ietf.org>
Subject: [EXTERNAL] apparent ambiguities in draft spec for Hystart++= window start/end?
 
Hi,

Thanks again for the nice Hystart++ draft!

Below are three quick comments about what AFAICT are some ambiguities = about the spec for detecting and handling window starts/ends, plus a sugges= tion for wording that section:

(1) Currently, the draft at:
  https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-hystartplusplus#secti= on-4.2
says:

      When windowEnd is ACKed, the current round ends and wi= ndowEnd is
      set to SND.NXT

IMHO this is a bit ambiguous as to whether it means:
(a)  if (SND.UNA > windowEnd)
or 
(b)  if (SND.UNA >=3D windowEnd)

Normally when I read that a sequence number X "is ACKed" I t= hink of the (b) case, i.e. SND.UNA >=3D X. But for application-limi= ted flights of data, I think that (b) interpretation would lead to the Hyst= art++ logic for the start/end of rounds potentially being executed twice for each flight of data: once for the first segment i= n the flight, and once for the last segment in the flight (because while pr= ocessing ACKs for an application-limited flight the value of SND.NXT may no= t change).

So I imagine the Hystart++ algorithm actually intends the (a) semantic= s. The (a) approach is what Linux TCP CUBIC Hystart does, and the AFAICT&nb= sp; (a) semantics give the correct once-per-round behavior even for applica= tion-limited flights. I think it would be good to express that aspect of the algorithm more precisely to indicate= the approach that is intended. 

(2) A second, related, issue: for per-round behavior section 4.2 of th= e algorithm specifies how to detect the end of a round ("When windowEnd is ACKed, the cur= rent round ends"), but only specifies what action is to be taken at the start of a round ("At the start of = each round during standard slow start ([RFC5681]) and CSS:").

I suppose the text is implicitly considering that the start of one rou= nd is the same as the end of the previous round. For bulk data that assumpt= ion might be acceptable; it might be fine to think of the start of one roun= d as the same as the end of the previous round. But for application-limited flights of data that assu= mption does not hold, and the start of a round and end of a round are very = different events with very different timing and characteristics. So for the= common case of application-limited flights of data currently the draft does not specify how to detect the "start= of each round" event that triggers the per-round actions; it only def= ines how to detect the "end" of a round.

(3)  A third, related, issue: the text in section 4.2 says:

   A round is chosen to be approximate=
ly the Round-Trip Time (RTT).

For application-limited flights this text is a poor or confusing fit. = For application-limited flights,  the duration of time between two suc= cessive rounds, aka the length of a round (IMHO), can be arbitrarily l= ong; it can be much longer than the RTT and perhaps hours or even days. I would suggest just dropping that sentence,&n= bsp;to avoid confusion.

---

(a suggestion):

To clear up these ambiguities I would suggest tweaking the existing te= xt from:

(before):
"""
   A round is chosen to be approximate=
ly the Round-Trip Time (RTT).  We
   recommend that rounds be measured using sequence numbers.  Round can
   be approximated using sequence numbers as follows:

      Define windowEnd as a sequence number initialize to SND.UNA

      When windowEnd is ACKed, the current round ends and windowEnd is
      set to SND.NXT

   At the start of each round during standard slow start ([RFC5681]) and
   CSS:
"""

...to be something more like the following:

(after):
"""
   Hystart++ measures rounds using seq=
uence numbers, as follows:

      Define windowEnd as a sequence number initialized to S= ND.UNA.

      Upon receiving an ACK, if (SND.UNA > windowEnd) the= n
      a new round has started and the sender sets windowEnd = to
      SND.NXT.

   At the start of each new round d= uring standard slow start ([RFC5681])
   and CSS:
"""

best regards,
neal


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One of the IESG comments on RFC 793bis was in regard to this text:

 TCP implementations SHOULD allow a received RST segment to include
 data (SHLD-2).

The question  was:

Is there an example of what possible use a RST w/ data could serve?

There isn't much to say about this, to my knowledge.  The only thing I'm aware of is the discussion of that requirement in RFC 1122, which only says:

            DISCUSSION
                 It has been suggested that a RST segment could contain
                 ASCII text that encoded and explained the cause of the
                 RST.  No standard has yet been established for such
                 data.

Do we want to repeat that in 793bis?  I didn't think it would be important to include, but since it was noted during the IESG reviews, maybe it should be stated.


--------------FvCYUJVXEUAKrc8BS8Gnsqi9-- From nobody Wed Jan 5 21:30:38 2022 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1E0EE3A0961 for ; Wed, 5 Jan 2022 21:30:37 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.318 X-Spam-Level: X-Spam-Status: No, score=-1.318 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_NEUTRAL=0.779, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=strayalpha.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id sK5ne1SdVeBO for ; Wed, 5 Jan 2022 21:30:32 -0800 (PST) Received: from server217-3.web-hosting.com (server217-3.web-hosting.com [198.54.115.226]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 378C83A095F for ; Wed, 5 Jan 2022 21:30:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=strayalpha.com; s=default; h=To:References:Message-Id:Cc:Date:In-Reply-To: From:Subject:Mime-Version:Content-Type:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=3FtqPB6sgIGAGnFOLoCdCYGiIc6NzWIC1VKD+C5Rr5o=; b=3dFWyAv5QjF3n1bjnad75uknN/ BeQHR3DgDLJJ5DcW8oWu3kwI7+U6ihh784jQONPLcaRd1EzlTxECaGOVzUnc9SNTQaZ0nE5xbpU4u 5aNlSiIRX32nAtkNMKPv6Qg0lNHdSORK1riU5MX2pzC61QVqgWJvdW9AjiHHow/wsiUsXp0NWNNAp Rs1D0EOBXjxM1GHC+KqmlwnccMWokXPXHeFjP9owKQ448hFueDC0Crb4erBBSv2xpYz3XEhEAIsNZ 22mygqUBx2cwvRbaB6UJj7DanycbfKU7Kgd2o4aFHjKYIyFvMHBmWXnpyyEJ0MS2BICbXbPXd44hX GZFenwTA==; Received: from cpe-172-114-237-88.socal.res.rr.com ([172.114.237.88]:59374 helo=smtpclient.apple) by server217.web-hosting.com with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1n5LM0-005Pgg-N8; Thu, 06 Jan 2022 00:30:29 -0500 Content-Type: multipart/alternative; boundary="Apple-Mail=_E65AFE0C-AE64-4985-B0CF-000F6437F46F" Mime-Version: 1.0 (Mac OS X Mail 15.0 \(3693.20.0.1.32\)) From: "touch@strayalpha.com" In-Reply-To: <072d9785-0ff3-f6c2-1ead-f695ec7d80e0@mti-systems.com> Date: Wed, 5 Jan 2022 21:30:23 -0800 Cc: tcpm IETF list , ek.ietf@gmail.com Message-Id: <03C02268-77F3-4F9E-BF07-9303D1ED9F2C@strayalpha.com> References: <072d9785-0ff3-f6c2-1ead-f695ec7d80e0@mti-systems.com> To: Wes Eddy X-Mailer: Apple Mail (2.3693.20.0.1.32) X-OutGoing-Spam-Status: No, score=-1.0 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server217.web-hosting.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - strayalpha.com X-Get-Message-Sender-Via: server217.web-hosting.com: authenticated_id: touch@strayalpha.com X-Authenticated-Sender: server217.web-hosting.com: touch@strayalpha.com X-Source: X-Source-Args: X-Source-Dir: X-From-Rewrite: unmodified, already matched Archived-At: Subject: Re: [tcpm] 793bis: purpose of RST w/ data X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 06 Jan 2022 05:30:37 -0000 --Apple-Mail=_E65AFE0C-AE64-4985-B0CF-000F6437F46F Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Hi, Wes,=20 It=E2=80=99s worth including that statement. I recall discussing = potential uses of that data, e.g, as a signal to why the RST occurred, = with some people MANY years ago, but it never went anywhere. At a = minimum, it should be allowed and ignored, as noted. Joe =E2=80=94 Joe Touch, temporal epistemologist www.strayalpha.com > On Jan 5, 2022, at 9:02 PM, Wesley Eddy wrote: >=20 > One of the IESG comments on RFC 793bis was in regard to this text: >=20 > TCP implementations SHOULD allow a received RST segment to include > data (SHLD-2). >=20 > The question was: >=20 > Is there an example of what possible use a RST w/ data could serve? >=20 > There isn't much to say about this, to my knowledge. The only thing = I'm aware of is the discussion of that requirement in RFC 1122, which = only says: >=20 > DISCUSSION > It has been suggested that a RST segment could = contain > ASCII text that encoded and explained the cause of = the > RST. No standard has yet been established for such > data. > Do we want to repeat that in 793bis? I didn't think it would be = important to include, but since it was noted during the IESG reviews, = maybe it should be stated. >=20 >=20 >=20 > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm --Apple-Mail=_E65AFE0C-AE64-4985-B0CF-000F6437F46F Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 Hi, = Wes, 

It=E2=80=99= s worth including that statement. I recall discussing potential uses of = that data, e.g, as a signal to why the RST occurred, with some people = MANY years ago, but it never went anywhere. At a minimum, it should be = allowed and ignored, as noted.

Joe

=E2=80=94
Joe Touch, = temporal epistemologist
www.strayalpha.com

On Jan 5, 2022, at 9:02 PM, Wesley Eddy <wes@mti-systems.com>= wrote:

=20 =20

One of the IESG comments on RFC 793bis = was in regard to this text:

 TCP implementations = SHOULD allow a received RST segment to include
 data (SHLD-2).

The question  was:

Is there an example of what = possible use a RST w/ data could serve?

There isn't much to say about this, to my = knowledge.  The only thing I'm aware of is the discussion of that requirement in RFC 1122, which only says:

            DISCUSSION
                 It has been suggested that a RST segment could contain
                 ASCII text that encoded and explained the cause of the
                 RST.  No standard has yet been established for such
                 data.

Do we want to repeat that in = 793bis?  I didn't think it would be important to include, but since it was noted during the IESG reviews, maybe it should be stated.


=

_______________________________________________
tcpm = mailing list
tcpm@ietf.org
https://www.ietf.org/mailman/listinfo/tcpm

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gabriel-smtp.zfn.uni-bremen.de (Postfix) with ESMTPSA id 4JTz5C6LxdzDCc6; Thu, 6 Jan 2022 08:49:19 +0100 (CET) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.120.23.2.7\)) From: Carsten Bormann In-Reply-To: <20133_1641454145_61D69A41_20133_410_1_787AE7BB302AE849A7480A190F8B93303546EB13@OPEXCAUBMA2.corporate.adroot.infra.ftgroup> Date: Thu, 6 Jan 2022 08:49:19 +0100 Cc: Wesley Eddy , tcpm IETF list , "ek.ietf@gmail.com" X-Mao-Original-Outgoing-Id: 663148159.477033-cbb242d31a48e64b757b744e3c7052b4 Content-Transfer-Encoding: quoted-printable Message-Id: <6EEE12D7-53EE-4BA4-B06D-38CBCCC34215@tzi.org> References: <072d9785-0ff3-f6c2-1ead-f695ec7d80e0@mti-systems.com> <20133_1641454145_61D69A41_20133_410_1_787AE7BB302AE849A7480A190F8B93303546EB13@OPEXCAUBMA2.corporate.adroot.infra.ftgroup> To: mohamed.boucadair@orange.com X-Mailer: Apple Mail (2.3608.120.23.2.7) Archived-At: Subject: Re: [tcpm] 793bis: purpose of RST w/ data X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 06 Jan 2022 07:49:31 -0000 We call it =E2=80=9Cdiagnostic payload=E2=80=9D in RFC 7252. https://datatracker.ietf.org/doc/html/rfc7252#section-5.5.2 Gr=C3=BC=C3=9Fe, Carsten > On 2022-01-06, at 08:29, mohamed.boucadair@orange.com wrote: >=20 > It makes sense to include the example but without the =E2=80=9CASCII = text=E2=80=9D thing. =20 >=20 From nobody Thu Jan 6 07:30:14 2022 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1DB1B3A1125 for ; Thu, 6 Jan 2022 07:30:12 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.318 X-Spam-Level: X-Spam-Status: No, score=-1.318 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, 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Mime-Version: 1.0 (Mac OS X Mail 15.0 \(3693.20.0.1.32\)) From: "touch@strayalpha.com" In-Reply-To: <6EEE12D7-53EE-4BA4-B06D-38CBCCC34215@tzi.org> Date: Thu, 6 Jan 2022 07:30:00 -0800 Cc: mohamed.boucadair@orange.com, "ek.ietf@gmail.com" , tcpm IETF list Message-Id: <9A06E9F1-BF9B-4082-8107-C1A9AEA95BC7@strayalpha.com> References: <072d9785-0ff3-f6c2-1ead-f695ec7d80e0@mti-systems.com> <20133_1641454145_61D69A41_20133_410_1_787AE7BB302AE849A7480A190F8B93303546EB13@OPEXCAUBMA2.corporate.adroot.infra.ftgroup> <6EEE12D7-53EE-4BA4-B06D-38CBCCC34215@tzi.org> To: Carsten Bormann X-Mailer: Apple Mail (2.3693.20.0.1.32) X-OutGoing-Spam-Status: No, score=-1.0 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server217.web-hosting.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - strayalpha.com X-Get-Message-Sender-Via: server217.web-hosting.com: authenticated_id: touch@strayalpha.com X-Authenticated-Sender: server217.web-hosting.com: touch@strayalpha.com X-Source: X-Source-Args: X-Source-Dir: X-From-Rewrite: unmodified, already matched Archived-At: Subject: Re: [tcpm] 793bis: purpose of RST w/ data X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 06 Jan 2022 15:30:12 -0000 --Apple-Mail=_166E05D0-48D6-4561-94BC-89D6A1C2ED7A Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 FWIW, some middleboxes that use RSTs to kill connections place reference = IDs in the payload for tracing, e.g., see here: https://serverfault.com/questions/746570/rst-ack-with-reset-cause = https://support.f5.com/csp/article/K13223 = =E2=80=94 Joe Touch, temporal epistemologist www.strayalpha.com > On Jan 5, 2022, at 11:49 PM, Carsten Bormann wrote: >=20 > We call it =E2=80=9Cdiagnostic payload=E2=80=9D in RFC 7252. >=20 > https://datatracker.ietf.org/doc/html/rfc7252#section-5.5.2 >=20 > Gr=C3=BC=C3=9Fe, Carsten >=20 >=20 >> On 2022-01-06, at 08:29, mohamed.boucadair@orange.com wrote: >>=20 >> It makes sense to include the example but without the =E2=80=9CASCII = text=E2=80=9D thing. =20 >>=20 >=20 > _______________________________________________ > tcpm mailing list > tcpm@ietf.org > https://www.ietf.org/mailman/listinfo/tcpm --Apple-Mail=_166E05D0-48D6-4561-94BC-89D6A1C2ED7A Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 FWIW,= some middleboxes that use RSTs to kill connections place reference IDs = in the payload for tracing, e.g., see here:
https://serverfault.com/questions/746570/rst-ack-with-reset-cau= se
https://support.f5.com/csp/article/K13223

=E2=80=94
Joe Touch, = temporal epistemologist
www.strayalpha.com

On Jan 5, 2022, at 11:49 PM, Carsten Bormann <cabo@tzi.org> = wrote:

We call it =E2=80=9Cdiagnostic payload=E2=80=9D in RFC = 7252.

https://datatracker.ietf.org/doc/html/rfc7252#section-5.5.2=

Gr=C3=BC=C3=9Fe, Carsten


On = 2022-01-06, at 08:29, mohamed.boucadair@orange.com wrote:

It makes sense to include the example but = without the =E2=80=9CASCII text=E2=80=9D thing.  


_______________________________________________
tcpm mailing list
tcpm@ietf.org
https://www.ietf.org/mailman/listinfo/tcpm

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[69.135.1.122]) by smtp.gmail.com with ESMTPSA id s3sm1972244qkp.93.2022.01.06.11.54.08 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 06 Jan 2022 11:54:08 -0800 (PST) Content-Type: multipart/alternative; boundary="------------YUoXb72QLxgi0tJwxtKbuoOp" Message-ID: <7ee789f3-3446-3fe2-0a5b-fa81c73006df@mti-systems.com> Date: Thu, 6 Jan 2022 14:54:07 -0500 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.4.1 Content-Language: en-US To: Zaheduzzaman Sarker , The IESG Cc: "draft-ietf-tcpm-rfc793bis@ietf.org" , "tcpm-chairs@ietf.org" , "tcpm@ietf.org" , Michael Scharf References: <163234356267.14096.14587632428023214216@ietfa.amsl.com> <4a3226f7-631d-7c04-e24d-b855d48825af@mti-systems.com> From: Wesley Eddy In-Reply-To: Archived-At: Subject: Re: [tcpm] Zaheduzzaman Sarker's Discuss on draft-ietf-tcpm-rfc793bis-25: (with DISCUSS and COMMENT) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 06 Jan 2022 19:54:13 -0000 This is a multi-part message in MIME format. --------------YUoXb72QLxgi0tJwxtKbuoOp Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit This has been on the back burner for a while, but looping back to it now ... here are some changes I've got ready for submission in a -26 revision, to see if they sound good to you. On 9/24/2021 6:01 AM, Zaheduzzaman Sarker wrote: > > As we are not deprecating the use of urgent mechanism and it is MUST > to support any details to support that is still normative. One > alternative would be to bring the related parts of 6093 to the 793bis > and be explicit about the warning ( different and incompatible), this > fits to intention you describes also perhaps fits better to the fact > that 793bis is obsoleting 6093. > In 793bis, the change in the definition of the urgent pointer from 6093 has been fully incorporated.  The only value to referencing 6093 is to point to historic and contextual information to explain the odd situation.  In the working copy, I've changed the sentence referencing to it from: Details can be found in RFC 6093. to: Information on how some TCP implementations interpret the urgent pointer can be found in RFC 6093. To be clear, there are no details required for a correct implementation in 6093 that aren't in 793bis; 6093 just provided a lot of explanation about the situation of the urgent pointer, implementation status, usage by applications, and then made the SHLD-13 and MUST-30 statements (that are in 793bis) as a result. > Feels like 793bis then should update 1011 as well, as it does to 1122. > You're right, since this is the new TCP specification, it should update 1011 to say that the things noted there have been included.  I've added that in the working copy, and some text explaining it as: RFC 1011 contains a number of comments about RFC 793, including some needed changes to the TCP specification.  [...]  The present document updates RFC 1011, since the comments noted in 1011 have been incorporated.:w --------------YUoXb72QLxgi0tJwxtKbuoOp Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit

This has been on the back burner for a while, but looping back to it now ... here are some changes I've got ready for submission in a -26 revision, to see if they sound good to you.

On 9/24/2021 6:01 AM, Zaheduzzaman Sarker wrote:

As we are not deprecating the use of urgent mechanism and it is MUST to support any details to support that is still normative. One alternative would be to bring the related parts of 6093 to the 793bis and be explicit about the warning ( different and incompatible), this fits to intention you describes also perhaps fits better to the fact that 793bis is obsoleting 6093.

In 793bis, the change in the definition of the urgent pointer from 6093 has been fully incorporated.  The only value to referencing 6093 is to point to historic and contextual information to explain the odd situation.  In the working copy, I've changed the sentence referencing to it from:

Details can be found in RFC 6093.

to:

Information on how some TCP implementations interpret the urgent pointer can be found in RFC 6093.

To be clear, there are no details required for a correct implementation in 6093 that aren't in 793bis; 6093 just provided a lot of explanation about the situation of the urgent pointer, implementation status, usage by applications, and then made the SHLD-13 and MUST-30 statements (that are in 793bis) as a result.


Feels like 793bis then should update 1011 as well, as it does to 1122.

You're right, since this is the new TCP specification, it should update 1011 to say that the things noted there have been included.  I've added that in the working copy, and some text explaining it as:

RFC 1011 contains a number of comments about RFC 793, including some needed changes to the TCP specification.  [...]  The present document updates RFC 1011, since the comments noted in 1011 have been incorporated.:w

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[69.135.1.122]) by smtp.gmail.com with ESMTPSA id r16sm2228968qkp.42.2022.01.06.13.13.59 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 06 Jan 2022 13:13:59 -0800 (PST) Content-Type: multipart/alternative; boundary="------------1vUGVNKgVI9VhrcukeTfQn3u" Message-ID: <61e941b6-4fe3-fa76-cfcc-d68c695f0237@mti-systems.com> Date: Thu, 6 Jan 2022 16:13:54 -0500 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.4.1 Content-Language: en-US To: John Scudder , The IESG Cc: draft-ietf-tcpm-rfc793bis@ietf.org, tcpm-chairs@ietf.org, tcpm@ietf.org, Michael Scharf References: <163236242658.4897.3790094103078602735@ietfa.amsl.com> From: Wesley Eddy In-Reply-To: <163236242658.4897.3790094103078602735@ietfa.amsl.com> Archived-At: Subject: Re: [tcpm] John Scudder's No Objection on draft-ietf-tcpm-rfc793bis-25: (with COMMENT) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 06 Jan 2022 21:14:07 -0000 This is a multi-part message in MIME format. --------------1vUGVNKgVI9VhrcukeTfQn3u Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit At long last, I've had a chance to go through these comments; thanks for your patience. On 9/22/2021 10:00 PM, John Scudder via Datatracker wrote: > John Scudder has entered the following ballot position for > draft-ietf-tcpm-rfc793bis-25: No Objection > > When responding, please keep the subject line intact and reply to all > email addresses included in the To and CC lines. (Feel free to cut this > introductory paragraph, however.) > > > Please refer tohttps://www.ietf.org/blog/handling-iesg-ballot-positions/ > for more information about how to handle DISCUSS and COMMENT positions. > > > The document, along with other ballot positions, can be found here: > https://datatracker.ietf.org/doc/draft-ietf-tcpm-rfc793bis/ > > > > ---------------------------------------------------------------------- > COMMENT: > ---------------------------------------------------------------------- > > Thanks very much for this document and all the work that went into it. Thanks > also for the clear and illuminating shepherd write-up. > > Below are some comments I hope will be helpful. > > 1. Regarding in §1, > > The purpose of this document is to bring together all of the IETF > Standards Track changes that have been made to the base TCP > functional specification and unify them into an update of [RFC 793]. > > It also incorporates Informational documents, right? For example, RFC 6691 is > Informational, as is 6429. So, these are being elevated, by virtue of their/ > incorporation, to Standards Track. I'm not saying that's a problem, but the > quoted text, while technically accurate I suppose (it doesn't say "exclusively > Standards Track changes" after all) is misleading. You're right.  I've adjusted the sentence in a working copy to become the -26 revision to say: ... to bring together all of the IETF Standards Track changes and other clarifications ... The "and other clarifications" covers things like 6691 and 6429. > > 2. Regarding, in §3.4, > > A new acknowledgment (called an "acceptable ack"), is one for which > the inequality below holds: > > SND.UNA < SEG.ACK =< SND.NXT > > I’m having a hard time seeing why the first part of the inequality is < and not > =<. Wouldn’t =< be the case when a single new byte is being acknowledged? > (Based on the definition that SND.UNA is the “oldest unacknowledged sequence > number” and therefore, presumably needs to be acknowledged.) I do see this text > is unchanged from RFC 793 so I am very likely wrong, but I’d appreciate knowing > WHY I’m wrong… It's because SEG.ACK is the next value expected to be received and is acknowledging the bytes prior to that, so for SND.UNA to be ack'ed, SEG.ACK has to be greater than it. > > 3. Regarding, in §3.4, > > even if data rates escalate to 10's of megabits/sec. At 100 > megabits/sec, the cycle time is 5.4 minutes, which may be a little > short, but still within reason. > > I realize this is, again, inherited from RFC 793 but it seems hopelessly quaint > in 2021 and not suitable for publication today. I mean, my unexceptional > commodity home connection is 1 Gbps and it just goes up from there. At 100 Gbps > we’re down to a cycle time of ~300 msec which no longer seems so easy to brush > off as "still within reason". I’m not suggesting this document has to fix the > problem, and indeed I’m aware there are other documents for this purpose — but > does the outdated text have to be retained? You're totally correct, in response to this and a similar comment from Lars, I added a paragraph to the working copy:     High performance cases will have shorter cycle times than those in the     megabits per second that the base TCP design described above considers.     At 1 Gbps, the cycle time is 34 seconds, only 3 seconds at 10 Gbps, and     around a third of a second at 100 Gbps.  In these higher performance cases,     TCP Timestamp options and Protection Against Wrapped Sequences (PAWS) provide the needed capability to detect and discard old     duplicates. > 4. The parenthetical reference to “User Telnet” in §3.8.3 seemed equally > anachronistic. Seems like it could just be removed. Ack.  Done in working copy. > 5. It made me sad while reviewing the document, that certain sections were > stingy with subsection numbering. In particular §3.4 has the unnumbered > subheadings "Initial Sequence Number Selection", "Knowing When to Keep Quiet", > and "The TCP Quiet Time Concept", and §3.5 has "Half-Open Connections and Other > Anomalies", "Reset Generation", and "Reset Processing". I think it would make > the document more usable if these were numbered, as we tend to do in the modern > era, and as the rest of the document does do. (I may have missed some, the list > above isn't necessarily exhaustive.) Lars made a similar comment, and I've attempted to fix this in the working copy.  That was something originally done intentionally to try to look as much like 793 as possible (and diffing from 793 directly was of interest to the WG early on), but I agree that at this point having more traditional and navigable sections is important. > Nits: > > 6. I found it odd that figure 11 uses Z and X as the sequence numbers, whereas > all the previous illustrations used actual numbers. It works of course, but > it's inconsistent. I haven't done anything about this one. > > 7. In §3.1: > > The control bits are also know as "flags" > > S/know/known/ Ack.  Fixed in working copy. > 8. In §3.1, “one’s complement” should be “ones’ complement”. Ack.  Fixed in working copy. > > 9. In §3.3.2: > > transitions are not not explicitly shown > > Presumably the double negation isn’t isn't deliberate. :-) Ack. Fixed in working copy. > > 10. In §3.4: > > next sequence number expected on an incoming segments > > Should be segment, singular. Ack.  Fixed in working copy. > 11. In §3.4: > > sequence space occupying controls > > I think this needs, or at least would be better with, a hyphen: “sequence > space-occupying controls” Ack.  Fixed in working copy. > 12. In several places, "anyways" should probably be "anyway". (At least my > dictionary suggests the change.) Ack.  I found 3 copies of this and fixed in my working draft. > 13. In §3.4: > > Hosts that prefer to avoid waiting are > willing to risk possible confusion of old and new packets at a given > destination may choose not to wait for the "quiet time". > > “Are willing” should be “and are willing” Ack.  Fixed in working copy. > 14. In §3.6: > > the user can terminate his side gracefully > > Perhaps consider a non-gendered pronoun such as "their"? Ack.  Fixed in working copy. > 15. In §3.8.2: > > [RFC 1122] required implementation of Van Jacobson's congestion control > algorithms slow start and congestion avoidance together with > > Seems as though there’s some punctuation missing. Perhaps “RFC 1122 required > implementation of Van Jacobson’s congestion control algorithms, slow start, and > congestion avoidance, together with“? I think maybe a ":" after "algorithms" would work. > 16. “Internet” is inconsistently capitalized throughout, probably corresponding > to age of the text. But I suppose the RFCEd will fix this. I haven't made any change related to this yet, and am happy to leave it to the RFC Editor's judgement. --------------1vUGVNKgVI9VhrcukeTfQn3u Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit

At long last, I've had a chance to go through these comments; thanks for your patience.


On 9/22/2021 10:00 PM, John Scudder via Datatracker wrote:
John Scudder has entered the following ballot position for
draft-ietf-tcpm-rfc793bis-25: No Objection

When responding, please keep the subject line intact and reply to all
email addresses included in the To and CC lines. (Feel free to cut this
introductory paragraph, however.)


Please refer to https://www.ietf.org/blog/handling-iesg-ballot-positions/
for more information about how to handle DISCUSS and COMMENT positions.


The document, along with other ballot positions, can be found here:
https://datatracker.ietf.org/doc/draft-ietf-tcpm-rfc793bis/



----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

Thanks very much for this document and all the work that went into it. Thanks
also for the clear and illuminating shepherd write-up.

Below are some comments I hope will be helpful.

1. Regarding in §1,

  The purpose of this document is to bring together all of the IETF
  Standards Track changes that have been made to the base TCP
  functional specification and unify them into an update of [RFC 793].

It also incorporates Informational documents, right? For example, RFC 6691 is
Informational, as is 6429. So, these are being elevated, by virtue of their/
incorporation, to Standards Track. I'm not saying that's a problem, but the
quoted text, while technically accurate I suppose (it doesn't say "exclusively
Standards Track changes" after all) is misleading.

You're right.  I've adjusted the sentence in a working copy to become the -26 revision to say:

... to bring together all of the IETF Standards Track changes and other clarifications ...

The "and other clarifications" covers things like 6691 and 6429.



2. Regarding, in §3.4,

  A new acknowledgment (called an "acceptable ack"), is one for which
  the inequality below holds:

   SND.UNA < SEG.ACK =< SND.NXT

I’m having a hard time seeing why the first part of the inequality is < and not
=<. Wouldn’t =< be the case when a single new byte is being acknowledged?
(Based on the definition that SND.UNA is the “oldest unacknowledged sequence
number” and therefore, presumably needs to be acknowledged.) I do see this text
is unchanged from RFC 793 so I am very likely wrong, but I’d appreciate knowing
WHY I’m wrong…

It's because SEG.ACK is the next value expected to be received and is acknowledging the bytes prior to that, so for SND.UNA to be ack'ed, SEG.ACK has to be greater than it.



3. Regarding, in §3.4,

     even if data rates escalate to 10's of megabits/sec. At 100
     megabits/sec, the cycle time is 5.4 minutes, which may be a little
     short, but still within reason.

I realize this is, again, inherited from RFC 793 but it seems hopelessly quaint
in 2021 and not suitable for publication today. I mean, my unexceptional
commodity home connection is 1 Gbps and it just goes up from there. At 100 Gbps
we’re down to a cycle time of ~300 msec which no longer seems so easy to brush
off as "still within reason". I’m not suggesting this document has to fix the
problem, and indeed I’m aware there are other documents for this purpose — but
does the outdated text have to be retained?

You're totally correct, in response to this and a similar comment from Lars, I added a paragraph to the working copy:

    High performance cases will have shorter cycle times than those in the
    megabits per second that the base TCP design described above considers.
    At 1 Gbps, the cycle time is 34 seconds, only 3 seconds at 10 Gbps, and
    around a third of a second at 100 Gbps.  In these higher performance cases,
    TCP Timestamp options and Protection Against Wrapped Sequences (PAWS) <xref
    target="RFC7323"/> provide the needed capability to detect and discard old
    duplicates.


4. The parenthetical reference to “User Telnet” in §3.8.3 seemed equally
anachronistic. Seems like it could just be removed.

Ack.  Done in working copy.


5. It made me sad while reviewing the document, that certain sections were
stingy with subsection numbering. In particular §3.4 has the unnumbered
subheadings "Initial Sequence Number Selection", "Knowing When to Keep Quiet",
and "The TCP Quiet Time Concept", and §3.5 has "Half-Open Connections and Other
Anomalies", "Reset Generation", and "Reset Processing". I think it would make
the document more usable if these were numbered, as we tend to do in the modern
era, and as the rest of the document does do. (I may have missed some, the list
above isn't necessarily exhaustive.)

Lars made a similar comment, and I've attempted to fix this in the working copy.  That was something originally done intentionally to try to look as much like 793 as possible (and diffing from 793 directly was of interest to the WG early on), but I agree that at this point having more traditional and navigable sections is important.


Nits:

6. I found it odd that figure 11 uses Z and X as the sequence numbers, whereas
all the previous illustrations used actual numbers. It works of course, but
it's inconsistent.

I haven't done anything about this one.



7. In §3.1:

   The control bits are also know as "flags"

   S/know/known/

Ack.  Fixed in working copy.


8. In §3.1, “one’s complement” should be “ones’ complement”.

Ack.  Fixed in working copy.



9. In §3.3.2:

   transitions are not not explicitly shown

   Presumably the double negation isn’t isn't deliberate. :-)

Ack. Fixed in working copy.



10. In §3.4:

    next sequence number expected on an incoming segments

    Should be segment, singular.

Ack.  Fixed in working copy.


11. In §3.4:

    sequence space occupying controls

    I think this needs, or at least would be better with, a hyphen: “sequence
    space-occupying controls”

Ack.  Fixed in working copy.


12. In several places, "anyways" should probably be "anyway". (At least my
dictionary suggests the change.)

Ack.  I found 3 copies of this and fixed in my working draft.


13. In §3.4:

  Hosts that prefer to avoid waiting are
  willing to risk possible confusion of old and new packets at a given
  destination may choose not to wait for the "quiet time".

“Are willing” should be “and are willing”

Ack.  Fixed in working copy.


14. In §3.6:

    the user can terminate his side gracefully

Perhaps consider a non-gendered pronoun such as "their"?

Ack.  Fixed in working copy.


15. In §3.8.2:

  [RFC 1122] required implementation of Van Jacobson's congestion control
  algorithms slow start and congestion avoidance together with

Seems as though there’s some punctuation missing. Perhaps “RFC 1122 required
implementation of Van Jacobson’s congestion control algorithms, slow start, and
congestion avoidance, together with“?

I think maybe a ":" after "algorithms" would work.


16. “Internet” is inconsistently capitalized throughout, probably corresponding
to age of the text. But I suppose the RFCEd will fix this.

I haven't made any change related to this yet, and am happy to leave it to the RFC Editor's judgement.

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[66.61.72.87]) by smtp.gmail.com with ESMTPSA id s3sm2635671qkp.93.2022.01.06.20.26.46 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 06 Jan 2022 20:26:47 -0800 (PST) Message-ID: <5a6dbb3f-22ba-2953-430b-3b4fac567181@mti-systems.com> Date: Thu, 6 Jan 2022 23:26:42 -0500 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.4.1 Content-Language: en-US To: Francesca Palombini , The IESG Cc: draft-ietf-tcpm-rfc793bis@ietf.org, tcpm-chairs@ietf.org, tcpm@ietf.org, Michael Scharf References: <163234555786.20689.7200051930871118197@ietfa.amsl.com> From: Wesley Eddy In-Reply-To: <163234555786.20689.7200051930871118197@ietfa.amsl.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [tcpm] Francesca Palombini's No Objection on draft-ietf-tcpm-rfc793bis-25: (with COMMENT) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 07 Jan 2022 04:26:55 -0000 Sorry for the very slow response, but I think all questions are answered below.  Thanks for your comments and patience. On 9/22/2021 5:19 PM, Francesca Palombini via Datatracker wrote: > Francesca Palombini has entered the following ballot position for > draft-ietf-tcpm-rfc793bis-25: No Objection > > When responding, please keep the subject line intact and reply to all > email addresses included in the To and CC lines. (Feel free to cut this > introductory paragraph, however.) > > > Please refer to https://www.ietf.org/blog/handling-iesg-ballot-positions/ > for more information about how to handle DISCUSS and COMMENT positions. > > > The document, along with other ballot positions, can be found here: > https://datatracker.ietf.org/doc/draft-ietf-tcpm-rfc793bis/ > > > > ---------------------------------------------------------------------- > COMMENT: > ---------------------------------------------------------------------- > > Thank you for the work on this document. I only have minor comments, and some > questions. > > I have divided comments into "minor" (including the questions) and "nits". > Neither require replies strictly speaking, please feel free to address as you > see fit. I will appreciate answers to my questions, to improve my > understanding. If any clarification comes out of it, I hope it will help > improve the document. > > Francesca > > ## minor > > 1. ----- > > Figure 1 > > FP: The figure's capture is "TCP Header Format", but Options and Data are > included as well. Yeah, that is true it's really the header format within the context of a full segment.  The options are part of the header, but including the data makes it a full segment.  I can add a quick note about that in the working copy. > 2. ----- > > Figure 2 > > FP: For consistency, I would have kept the same style as in Figure 1. > Additionally, the IPv4 fields below do not have their size explicitly > specified, so using the same type of formatting as in Figure 1 would help, IMO. That makes sense.  This was just retaining the way 793 originally showed it. > > 3. ----- > > 0 > 0 1 2 3 4 5 6 7 > +-+-+-+-+-+-+-+-+ > | 0 | > +-+-+-+-+-+-+-+-+ > > FP: More of a question than a comment: how come this change, compared to RFC > 793? Any particular reason, or was it only for readability? This was just part of making the format descriptions readable by tooling, conforming to: https://datatracker.ietf.org/doc/html/draft-mcquistin-augmented-ascii-diagrams > > 4. ----- > > FP: This is surely me missing something but, in section 3.5 I see: > > 4. ESTABLISHED --> --> ESTABLISHED > > 5. ESTABLISHED --> --> ESTABLISHED > > which is followed by: > > Note that the sequence number of the segment in line 5 is the same as > in line 4 because the ACK does not occupy sequence number space (if > it did, we would wind up ACKing ACKs!). > > However, later on, in Figure 13: > > 2. (Close) (Close) > FIN-WAIT-1 --> ... FIN-WAIT-1 > <-- <-- > ... --> > > 3. CLOSING --> ... CLOSING > <-- <-- > ... --> > > I am confused why in this case, in line 3, ACK does in fact occupy sequence > number space. What am I missing? In line 3 if the sequence number was 100, that would be a retransmission of the FIN, rather than just an ACK that covers the other side's FIN (300).  There's no data in the segment, so the sequence number is just meaningful for validation. > > ## nit > > 5. ----- > > Initial Sequence Number Selection > > FP: I assume this (and following) was not numbered to keep it as close as > possible to the original RFC, is that right? For readability, I would suggest > numbering these subsections. Yes, this was originally an attempt to stay close to the original formatting.  A number of other IESG comments remarked similarly to your comment, and in the working copy, these subsections all have proper numbers now. From nobody Fri Jan 7 08:45:05 2022 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9D7653A0BFE; Fri, 7 Jan 2022 08:44:57 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.897 X-Spam-Level: X-Spam-Status: No, score=-1.897 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id KfhhpiK7T__2; Fri, 7 Jan 2022 08:44:53 -0800 (PST) Received: from frantic.weston.BORMAN.COM (frantic.weston.borman.com [70.57.156.33]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 209AE3A0BFB; Fri, 7 Jan 2022 08:44:52 -0800 (PST) Received: from local-25.weston.borman.com (local-25.weston.borman.com [192.168.1.25]) (authenticated bits=0) by frantic.weston.BORMAN.COM (8.14.7/8.14.7) with ESMTP id 207Gtw5W027786 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Fri, 7 Jan 2022 10:55:59 -0600 Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.21\)) From: David Borman In-Reply-To: <5a6dbb3f-22ba-2953-430b-3b4fac567181@mti-systems.com> Date: Fri, 7 Jan 2022 10:44:45 -0600 Cc: Francesca Palombini , The IESG , draft-ietf-tcpm-rfc793bis@ietf.org, tcpm@ietf.org, tcpm-chairs@ietf.org Content-Transfer-Encoding: quoted-printable Message-Id: <637C526C-D418-4652-A2A3-5DEE59096BF8@weston.borman.com> References: <163234555786.20689.7200051930871118197@ietfa.amsl.com> <5a6dbb3f-22ba-2953-430b-3b4fac567181@mti-systems.com> To: "Wesley M. Eddy" X-Mailer: Apple Mail (2.3445.104.21) Archived-At: Subject: Re: [tcpm] Francesca Palombini's No Objection on draft-ietf-tcpm-rfc793bis-25: (with COMMENT) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 07 Jan 2022 16:44:58 -0000 > On Jan 6, 2022, at 10:26 PM, Wesley Eddy wrote: >=20 > Sorry for the very slow response, but I think all questions are = answered below. Thanks for your comments and patience. >=20 >=20 > On 9/22/2021 5:19 PM, Francesca Palombini via Datatracker wrote: >> Francesca Palombini has entered the following ballot position for >> draft-ietf-tcpm-rfc793bis-25: No Objection ... >=20 >>=20 >> 4. ----- >>=20 >> FP: This is surely me missing something but, in section 3.5 I see: >>=20 >> 4. ESTABLISHED --> --> = ESTABLISHED >>=20 >> 5. ESTABLISHED --> --> = ESTABLISHED >>=20 >> which is followed by: >>=20 >> Note that the sequence number of the segment in line 5 is the same = as >> in line 4 because the ACK does not occupy sequence number space = (if >> it did, we would wind up ACKing ACKs!). >>=20 >> However, later on, in Figure 13: >>=20 >> 2. (Close) (Close) >> FIN-WAIT-1 --> ... = FIN-WAIT-1 >> <-- <-- >> ... --> >>=20 >> 3. CLOSING --> ... = CLOSING >> <-- <-- >> ... --> >>=20 >> I am confused why in this case, in line 3, ACK does in fact occupy = sequence >> number space. What am I missing? >=20 > In line 3 if the sequence number was 100, that would be a = retransmission of the FIN, rather than just an ACK that covers the other = side's FIN (300). There's no data in the segment, so the sequence = number is just meaningful for validation. To be clear, it is the FIN that occupies one byte in the sequence space, = not the ACK. 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[66.61.72.87]) by smtp.gmail.com with ESMTPSA id s19sm4341519qtk.40.2022.01.07.11.04.25 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 07 Jan 2022 11:04:26 -0800 (PST) Content-Type: multipart/alternative; boundary="------------RvBGTSB7O6L7J7GNuNZgUd2n" Message-ID: <9e0080c6-8540-c145-2fa6-c8ba82bdabce@mti-systems.com> Date: Fri, 7 Jan 2022 14:04:23 -0500 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.4.1 Content-Language: en-US To: Zaheduzzaman Sarker , The IESG Cc: draft-ietf-tcpm-rfc793bis@ietf.org, tcpm-chairs@ietf.org, tcpm@ietf.org, Michael Scharf References: <163234356267.14096.14587632428023214216@ietfa.amsl.com> From: Wesley Eddy In-Reply-To: <163234356267.14096.14587632428023214216@ietfa.amsl.com> Archived-At: Subject: Re: [tcpm] Zaheduzzaman Sarker's Discuss on draft-ietf-tcpm-rfc793bis-25: (with DISCUSS and COMMENT) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 07 Jan 2022 19:04:32 -0000 This is a multi-part message in MIME format. --------------RvBGTSB7O6L7J7GNuNZgUd2n Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Hello, we had corresponded about your DISCUSS points a bit earlier, but now I've also had the time to go through your other COMMENTs: On 9/22/2021 4:46 PM, Zaheduzzaman Sarker via Datatracker wrote: > Zaheduzzaman Sarker has entered the following ballot position for > draft-ietf-tcpm-rfc793bis-25: Discuss > ... > > > ---------------------------------------------------------------------- > COMMENT: > ---------------------------------------------------------------------- > > Thanks a lot to the author and the TCPM working group to produce this document. > It has been long since I read the whole TCP specification, I refreshed myself a > lot when reviewing this. Thanks for that experience. Thank you! > > I have some comments/questions below. By addressing those, I hope will improve > the document even better: > > * Section 3.1 : says -- > Note that the list of options may be shorter than the data offset field > might imply. The content of the header beyond the End-of-Option option > must be header padding (i.e., zero). > > Should this be a normative MUST? Great question ... The EOL option is a zero byte, and the first such option should signal that the option list is over.  So the receiver shouldn't need to process or check any further bytes of options to see if they're also properly zero'ed padding. So, I wouldn't think this needs to be normative, since if it's not followed, no harm should result.  However, that leads to the question of why it says they must be set to zero then.  Maybe someone else from TCPM has a better answer than "that's just what it's always said" ... To me, it seems like it's a good thing to do, but maybe not really required. > > * Passive open and active open should be defined/described. Even if these are > well known terms in the community, a verbose description of passive/active open > will be much appreciated in this document context. if they are defined > somewhere else then I have missed that, in that case a reference would be more > appropriate. This is a good point, and was clear in the original 793, so maybe we can just include the relevant text from there (pasted below). I'll try to find the best place to fit a slightly edited version of this in for -26, if you agree: The OPEN call also specifies whether the connection establishment is to be actively pursued, or to be passively waited for. A passive OPEN request means that the process wants to accept incoming connection requests rather than attempting to initiate a connection. Often the process requesting a passive OPEN will accept a connection request from any caller. In this case a foreign socket of all zeros is used to denote an unspecified socket. Unspecified foreign sockets are allowed only on passive OPENs. A service process that wished to provide services for unknown other processes would issue a passive OPEN request with an unspecified foreign socket. Then a connection could be made with any process that requested a connection to this local socket. > * Section 3.4 : says -- > There are security issues that result if an off-path attacker is able to > predict or guess ISN values. > > A reference to this claim would be highly appreciated. May be we can reuse > some ref from 41? I also think "Initial Sequence Number Selection", "Knowing > When to Keep Quiet" and "The TCP Quiet Time Concept" should be numbered > subtitles. ACK, I'll add a reference here, and these sections are now numbered in my working copy. > > * Section 3.5 : can we put some reference for "security level or compartment"? > A pointer to the appendix A.1 should be enough here. ACK, this is now in my working copy. > > * Section 3.8.1 : says -- > > RFC 793 contains an early example procedure for computing the RTO. This was > then replaced by the algorithm described in RFC 1122, and subsequently > updated in RFC 2988, and then again in RFC 6298. > > I am not sure what am I supposed to do with this information. Suggest to > remove this paragraph. The intention was to make sure that it's clear 6298 is the place to look, and that the other descriptions have been replaced by it.  Maybe we used too many words for this small of a point though, and could say it more succinctly. > * Section 3.8.5 : describes -- > > A TCP implementation MUST support a sequence of urgent data of any length > (MUST-31). [18] > > I am not sure what is the reference for? if this is to say this MUST is taken > from [18] as described there then to me this reference also should be > normative. > It's only a reference to where that requirement originally appeared, and nothing further from [18] (RFC 1122) is needed to implement this properly. --------------RvBGTSB7O6L7J7GNuNZgUd2n Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit

Hello, we had corresponded about your DISCUSS points a bit earlier, but now I've also had the time to go through your other COMMENTs:


On 9/22/2021 4:46 PM, Zaheduzzaman Sarker via Datatracker wrote:
Zaheduzzaman Sarker has entered the following ballot position for
draft-ietf-tcpm-rfc793bis-25: Discuss
...


----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

Thanks a lot to the author and the TCPM working group to produce this document.
It has been long since I read the whole TCP specification, I refreshed myself a
lot when reviewing this. Thanks for that experience.

Thank you!



I have some comments/questions below. By addressing those, I hope will improve
the document even better:

* Section 3.1 : says --
     Note that the list of options may be shorter than the data offset field
     might imply. The content of the header beyond the End-of-Option option
     must be header padding (i.e., zero).

   Should this be a normative MUST?

Great question ... The EOL option is a zero byte, and the first such option should signal that the option list is over.  So the receiver shouldn't need to process or check any further bytes of options to see if they're also properly zero'ed padding.

So, I wouldn't think this needs to be normative, since if it's not followed, no harm should result.  However, that leads to the question of why it says they must be set to zero then.  Maybe someone else from TCPM has a better answer than "that's just what it's always said" ... To me, it seems like it's a good thing to do, but maybe not really required.



* Passive open and active open should be defined/described. Even if these are
well known terms in the community, a verbose description of passive/active open
will be much appreciated in this document context. if they are defined
somewhere else then I have missed that, in that case a reference would be more
appropriate.

This is a good point, and was clear in the original 793, so maybe we can just include the relevant text from there (pasted below).  I'll try to find the best place to fit a slightly edited version of this in for -26, if you agree:

  The OPEN call also specifies
  whether the connection establishment is to be actively pursued, or to
  be passively waited for.

  A passive OPEN request means that the process wants to accept incoming
  connection requests rather than attempting to initiate a connection.
  Often the process requesting a passive OPEN will accept a connection
  request from any caller.  In this case a foreign socket of all zeros
  is used to denote an unspecified socket.  Unspecified foreign sockets
  are allowed only on passive OPENs.

  A service process that wished to provide services for unknown other
  processes would issue a passive OPEN request with an unspecified
  foreign socket.  Then a connection could be made with any process that
  requested a connection to this local socket.



* Section 3.4 : says --
    There are security issues that result if an off-path attacker is able to
    predict or guess ISN values.

   A reference to this claim would be highly appreciated. May be we can reuse
   some ref from 41? I also think "Initial Sequence Number Selection", "Knowing
   When to Keep Quiet" and "The TCP Quiet Time Concept" should be numbered
   subtitles.

ACK, I'll add a reference here, and these sections are now numbered in my working copy.



* Section 3.5 : can we put some reference for "security level or compartment"?
A pointer to the appendix A.1 should be enough here.

ACK, this is now in my working copy.



* Section 3.8.1 : says --

   RFC 793 contains an early example procedure for computing the RTO. This was
   then replaced by the algorithm described in RFC 1122, and subsequently
   updated in RFC 2988, and then again in RFC 6298.

  I am not sure what am I supposed to do with this information. Suggest to
  remove this paragraph.

The intention was to make sure that it's clear 6298 is the place to look, and that the other descriptions have been replaced by it.  Maybe we used too many words for this small of a point though, and could say it more succinctly.


* Section 3.8.5 : describes --

    A TCP implementation MUST support a sequence of urgent data of any length
    (MUST-31). [18]

  I am not sure what is the reference for? if this is to say this MUST is taken
  from [18] as described there then to me this reference also should be
  normative.

It's only a reference to where that requirement originally appeared, and nothing further from [18] (RFC 1122) is needed to implement this properly.


--------------RvBGTSB7O6L7J7GNuNZgUd2n-- From nobody Fri Jan 7 12:12:50 2022 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AACA33A12ED for ; Fri, 7 Jan 2022 12:12:43 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.61 X-Spam-Level: X-Spam-Status: No, score=-2.61 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HTML_MESSAGE=0.001, NICE_REPLY_A=-0.714, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=mti-systems-com.20210112.gappssmtp.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id sWAb1GNIqjHn for ; Fri, 7 Jan 2022 12:12:39 -0800 (PST) Received: from mail-qk1-x729.google.com (mail-qk1-x729.google.com [IPv6:2607:f8b0:4864:20::729]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7FB203A13C0 for ; Fri, 7 Jan 2022 12:12:39 -0800 (PST) Received: by mail-qk1-x729.google.com with SMTP id 69so7062188qkd.6 for ; Fri, 07 Jan 2022 12:12:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mti-systems-com.20210112.gappssmtp.com; s=20210112; h=message-id:date:mime-version:user-agent:subject:content-language:to :cc:references:from:in-reply-to; bh=HPejV5+BEeddHlytPviX74WcQ17Fmjn6HwdebLL2l3Q=; b=vUBz0STWjQsp4378IycHL8AVjgDlPspHgBf6JHoqVzawlgQxcPabX0eu/TfSypfuI9 Tx3wQrnvYnBfZnafOuYRw4ayhDUFCzH+OkX+hOByhgJii9ondeiUInikjeFI8IPAeWkw oGnOIjeAH/kWOOQ91pjbkDFX4yoNaqJvFYsPLQ+LNdevk/PIitutxOWrdLVDuo904+b1 H772xggURLn6Fx0q3Sudx+higaoNBiptGmaciUGguDhAm4pjvAzh62s9WcvQlzjtHeqH E5Pc7Mqvp27Jt/rDmaQOuU/pzVYaI8+9tb2N4RF4de04ly3Nb07A/cIIL8NDdUOtJJBk /WJg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:message-id:date:mime-version:user-agent:subject :content-language:to:cc:references:from:in-reply-to; bh=HPejV5+BEeddHlytPviX74WcQ17Fmjn6HwdebLL2l3Q=; b=PE3jOl4G75vR9ujZeaj0UOVMVuj/h+qwCqaK7kM9pdToC0T6JrlFyqHdmsOXuY6U0/ 7sM9qmShe7QBhS21pPIYSN/zUxn4ZBc9now8kGShQUSFun3yTZiD9VrU0JfyQVHNqlX5 5UHY0JSOjULsO6oud2DKp1jLf8F/vctrOHTvXB+ikSS0W+oEBu+4HZIBeP2GYtseXqHa FE+VZiE06DEuPBwIMfzcKWjPbY8r6iwEM1y8pAsfG8bM5MGV1jiLZYSc3HvzoGYNFAsa uyhUyAScXYTE8g1efoFD9rwQIyNHIwjKh6NsABCbgZccBNHGhzGnWcEfvBOCEls2NwLH XWAQ== X-Gm-Message-State: AOAM530ZIgJNs2XUerj+SulD5+WRpIRThe4lx7MMVdXY/YX3qDf5JcLG WrSKKVbm0QuqehAqSyIySbROLQ== X-Google-Smtp-Source: ABdhPJznQp6RchWeyfikrmUiZWuA6W+VGQvxfriDi0b0ZCh4evZIBVqDMr2NxoNhicAg/UERByjGBw== X-Received: by 2002:a05:620a:14c:: with SMTP id e12mr43111111qkn.503.1641586357028; Fri, 07 Jan 2022 12:12:37 -0800 (PST) Received: from [192.168.1.17] (cpe-66-61-72-87.neo.res.rr.com. [66.61.72.87]) by smtp.gmail.com with ESMTPSA id a15sm4308033qtb.5.2022.01.07.12.12.35 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 07 Jan 2022 12:12:36 -0800 (PST) Content-Type: multipart/alternative; boundary="------------eBDfcmH1lF3PikMBWdbuPI1e" Message-ID: <5c85c503-9113-6887-2c56-9b8fd9c0b469@mti-systems.com> Date: Fri, 7 Jan 2022 15:12:33 -0500 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.4.1 Content-Language: en-US To: Roman Danyliw , The IESG Cc: draft-ietf-tcpm-rfc793bis@ietf.org, tcpm-chairs@ietf.org, tcpm@ietf.org, Michael Scharf References: <163236958629.2342.800968324528950977@ietfa.amsl.com> From: Wesley Eddy In-Reply-To: <163236958629.2342.800968324528950977@ietfa.amsl.com> Archived-At: Subject: Re: [tcpm] Roman Danyliw's No Objection on draft-ietf-tcpm-rfc793bis-25: (with COMMENT) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 07 Jan 2022 20:12:44 -0000 This is a multi-part message in MIME format. --------------eBDfcmH1lF3PikMBWdbuPI1e Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Hello, at long last I've gone through these comments and have responses: On 9/22/2021 11:59 PM, Roman Danyliw via Datatracker wrote: > Roman Danyliw has entered the following ballot position for > draft-ietf-tcpm-rfc793bis-25: No Objection > > When responding, please keep the subject line intact and reply to all > email addresses included in the To and CC lines. (Feel free to cut this > introductory paragraph, however.) > > > Please refer tohttps://www.ietf.org/blog/handling-iesg-ballot-positions/ > for more information about how to handle DISCUSS and COMMENT positions. > > > The document, along with other ballot positions, can be found here: > https://datatracker.ietf.org/doc/draft-ietf-tcpm-rfc793bis/ > > > > ---------------------------------------------------------------------- > COMMENT: > ---------------------------------------------------------------------- > > Thank you to Kyle Rose for the SECDIR review. > > I support Ben, Lars, Warren and Zahed’s DISCUSS positions. > > ** Appendix A.1 and the shepherd write-up which explains why the antiquated > text around “security compartments” for multi-level systems is still in this > draft. It’s disappointing that there was no prior IETF consensus action to > establish the basis of pruning it. My suggested addition for Appendix A.1 > would be to make a much clearer statement than “the state of IP security > options that may be used by MLS systems is not as clean”. It isn’t clear what > is meant by “clean” – is it intended to say that it is not in fact used? I agree, this could be rephrased.  In the WG discussions, I think these are not known to be in current use, however, someone using them might not be participating in the WG (we are more concerned with typical Internet use, and not MLS systems).  The IETF has not got rid of these, though it could make sense to do so in the future.  Is there a specific way you'd like to see this described, or should I just take a stab at it? > > ** Section 3.1. Per “[TCP Option]; Options#Size == (DOffset-5)*32;”, I found > this notation confusing. What does the “#” in “Options#Size” indicate? Colin mentioned earlier that this is from draft-mcquistin-augmented-ascii-diagrams.  Based on your feedback, that 'Options#Size' notation has been changed to a "size(Options)", and this is reflected in my working copy. > > ** Section 3.4. Per “There are security issues that result if an off-path > attacker is able to predict or guess ISN values”, a reference might be helpful > for this statement. Perhaps [41] or [Morris185] from [41]. ACK; Zahed also mentioned this and I think [41] is a good reference because it includes some more context beyond just [Morris1985] alone, and of course it includes reference to [Morris1985] itself as well. > > ** Section 3.9.2 and 3.9.2.1 The text here discusses various IP options like > timestamp, record route and source routing. Either in this section or in the > Security Considerations the security implications of these options should be > highlights. Specifically, Section 4.3 – 4.5 of RFC7126 outline these security > issues and has normative guidance to treat these packets as default drop. > > ** Section 7. Recommend being more precise on the lack of security services: > > OLD > but there are no built-in cryptographic capabilities > to support any form of privacy, authentication > > NEW > but there are no built-in cryptographic capabilities > to support any form of confidentiality, authentication ACK.  This is updated in my working copy. > ** Section 7. > In order to fully protect TCP connections (including their control > flags) IPsec or the TCP Authentication Option (TCP-AO) [36] are the > only current effective methods. Other methods discussed in this > section may protect the payload > > The text should be more precise on what “protect” means. IPSec and TCP-AO > provide different security services. IPSec will provide confidentiality and > integrity, but TCP-AO only provides the latter. > > Likewise, the reference to protect the payload needs to be clarified. Which > exact security service does “protect” align with? Based on your exchange with Joe, I changed "protect" to "provide confidentiality and integrity for" in both places. > ** Section 7. Further discussion on TCP stack fingerprinting would be helpful. > RFC8546 notes that “In particular, the metadata, such as sequences of > interpacket timing and packet sizes, can be used to infer other parameters > of the behavior of the protocols in use or to fingerprint protocols and/or > specific implementations of those protocols.” However, it’s more than that – > it’s the specific choices of options, their sequence in the packets, etc. > Pretty much everything a tool like nmap does to profile host OSes. Good point.  In the working copy, I've added this below, though you might be able to suggest improvement: * There are also methods of "fingerprinting" that can be used to infer the host TCP implementation (operating system) version or platform information.  These collect observations of several aspects such as the options present in segments, the ordering of options, the specific behaviors in the case of various conditions, packet timing, packet sizing and other aspects of the protocol that are left to be determined by an implementer, and can use those observations to identify information about the host and implementation. --------------eBDfcmH1lF3PikMBWdbuPI1e Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit

Hello, at long last I've gone through these comments and have responses:


On 9/22/2021 11:59 PM, Roman Danyliw via Datatracker wrote:
Roman Danyliw has entered the following ballot position for
draft-ietf-tcpm-rfc793bis-25: No Objection

When responding, please keep the subject line intact and reply to all
email addresses included in the To and CC lines. (Feel free to cut this
introductory paragraph, however.)


Please refer to https://www.ietf.org/blog/handling-iesg-ballot-positions/
for more information about how to handle DISCUSS and COMMENT positions.


The document, along with other ballot positions, can be found here:
https://datatracker.ietf.org/doc/draft-ietf-tcpm-rfc793bis/



----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

Thank you to Kyle Rose for the SECDIR review.

I support Ben, Lars, Warren and Zahed’s DISCUSS positions.

** Appendix A.1 and the shepherd write-up which explains why the antiquated
text around “security compartments” for multi-level systems is still in this
draft.  It’s disappointing that there was no prior IETF consensus action to
establish the basis of pruning it.  My suggested addition for Appendix A.1
would be to make a much clearer statement than “the state of IP security
options that may be used by MLS systems is not as clean”.  It isn’t clear what
is meant by “clean” – is it intended to say that it is not in fact used?

I agree, this could be rephrased.  In the WG discussions, I think these are not known to be in current use, however, someone using them might not be participating in the WG (we are more concerned with typical Internet use, and not MLS systems).  The IETF has not got rid of these, though it could make sense to do so in the future.  Is there a specific way you'd like to see this described, or should I just take a stab at it?



** Section 3.1. Per “[TCP Option]; Options#Size == (DOffset-5)*32;”, I found
this notation confusing. What does the “#” in “Options#Size” indicate?

Colin mentioned earlier that this is from draft-mcquistin-augmented-ascii-diagrams.  Based on your feedback, that 'Options#Size' notation has been changed to a "size(Options)", and this is reflected in my working copy.



** Section 3.4.  Per “There are security issues that result if an off-path
attacker is able to predict or guess ISN values”, a reference might be helpful
for this statement.  Perhaps [41] or [Morris185] from [41].

ACK; Zahed also mentioned this and I think [41] is a good reference because it includes some more context beyond just [Morris1985] alone, and of course it includes reference to [Morris1985] itself as well.



** Section 3.9.2 and 3.9.2.1 The text here discusses various IP options like
timestamp, record route and source routing.  Either in this section or in the
Security Considerations the security implications of these options should be
highlights.  Specifically, Section 4.3 – 4.5 of RFC7126 outline these security
issues and has normative guidance to treat these packets as default drop.

** Section 7.  Recommend being more precise on the lack of security services:

OLD
but there are no built-in cryptographic capabilities
   to support any form of privacy, authentication

NEW
but there are no built-in cryptographic capabilities
   to support any form of confidentiality, authentication

ACK.  This is updated in my working copy.


** Section 7.
   In order to fully protect TCP connections (including their control
   flags) IPsec or the TCP Authentication Option (TCP-AO) [36] are the
   only current effective methods. Other methods discussed in this
   section may protect the payload

The text should be more precise on what “protect” means.  IPSec and TCP-AO
provide different security services.  IPSec will provide confidentiality and
integrity, but TCP-AO only provides the latter.

Likewise, the reference to protect the payload needs to be clarified.  Which
exact security service does “protect” align with?

Based on your exchange with Joe, I changed "protect" to "provide confidentiality and integrity for" in both places.


** Section 7.  Further discussion on TCP stack fingerprinting would be helpful.
 RFC8546 notes that “In particular, the metadata, such as sequences of
interpacket timing and packet sizes, can be used to    infer other parameters
of the behavior of the protocols in use or to fingerprint protocols and/or
specific implementations of those protocols.”  However, it’s more than that –
it’s the specific choices of options, their sequence in the packets, etc. 
Pretty much everything a tool like nmap does to profile host OSes.

Good point.  In the working copy, I've added this below, though you might be able to suggest improvement:

  • There are also methods of "fingerprinting" that can be used to infer the host TCP implementation (operating system) version or platform information.  These collect observations of several aspects such as the options present in segments, the ordering of options, the specific behaviors in the case of various conditions, packet timing, packet sizing and other aspects of the protocol that are left to be determined by an implementer, and can use those observations to identify information about the host and implementation.



--------------eBDfcmH1lF3PikMBWdbuPI1e-- From nobody Fri Jan 7 21:13:33 2022 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 65AE13A040C; Fri, 7 Jan 2022 21:13:26 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.318 X-Spam-Level: X-Spam-Status: No, score=-1.318 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_NEUTRAL=0.779, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=strayalpha.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id iSlZ80KaCb7v; Fri, 7 Jan 2022 21:13:22 -0800 (PST) Received: from server217-3.web-hosting.com (server217-3.web-hosting.com [198.54.115.226]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 40E5E3A040B; Fri, 7 Jan 2022 21:13:22 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=strayalpha.com; s=default; h=To:References:Message-Id:Cc:Date:In-Reply-To: From:Subject:Mime-Version:Content-Type:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=5/B0ikpmFyom059f7O2kr+yICJ97UDGiSLiRkCvtvUU=; b=tGm7cFmitwWI08nfgOVXcbmZG7 nojuI6WQXOcnL/H8Vbg5ngLC3QYuMKF/8Qh2VBQ/AG81gtizKhZMn6VawgTL4U/9jtFR13CB6aVd3 p2Pj9gbs27m4b8CwcAu3V8Gr4e8VLwRpdUL7ZAdmH5OvDQLCRieQm9eETfmINaDvhUmN8kpZz6xa+ EnCmlqgssKER23rEMjcNMw7MCflS9wIoiVBhyNGFS3QsKfSpqX4ZszKPvscBlWTeuG3vY2HY2YdQH IEHp63Qqua2KJeI4qhAeSOAqPD9t/ZkutUPsGF4qEL3ha3rP/DvLM/gOxUerhRWRaCPHnWykmjZ35 tmTxAnEg==; Received: from cpe-172-114-237-88.socal.res.rr.com ([172.114.237.88]:61694 helo=smtpclient.apple) by server217.web-hosting.com with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1n642X-00D8bJ-DX; Sat, 08 Jan 2022 00:13:21 -0500 Content-Type: multipart/alternative; boundary="Apple-Mail=_CBF74DDF-8ACC-4658-8392-D759E3AB11F6" Mime-Version: 1.0 (Mac OS X Mail 15.0 \(3693.20.0.1.32\)) From: "touch@strayalpha.com" In-Reply-To: <5c85c503-9113-6887-2c56-9b8fd9c0b469@mti-systems.com> Date: Fri, 7 Jan 2022 21:13:11 -0800 Cc: Roman Danyliw , The IESG , draft-ietf-tcpm-rfc793bis@ietf.org, tcpm IETF list , tcpm-chairs@ietf.org Message-Id: References: <163236958629.2342.800968324528950977@ietfa.amsl.com> <5c85c503-9113-6887-2c56-9b8fd9c0b469@mti-systems.com> To: Wes Eddy X-Mailer: Apple Mail (2.3693.20.0.1.32) X-OutGoing-Spam-Status: No, score=-1.0 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server217.web-hosting.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - strayalpha.com X-Get-Message-Sender-Via: server217.web-hosting.com: authenticated_id: touch@strayalpha.com X-Authenticated-Sender: server217.web-hosting.com: touch@strayalpha.com X-Source: X-Source-Args: X-Source-Dir: X-From-Rewrite: unmodified, already matched Archived-At: Subject: Re: [tcpm] Roman Danyliw's No Objection on draft-ietf-tcpm-rfc793bis-25: (with COMMENT) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 08 Jan 2022 05:13:27 -0000 --Apple-Mail=_CBF74DDF-8ACC-4658-8392-D759E3AB11F6 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 > On Jan 7, 2022, at 12:12 PM, Wesley Eddy wrote: >=20 >> ** Section 3.4. Per =E2=80=9CThere are security issues that result = if an off-path >> attacker is able to predict or guess ISN values=E2=80=9D, a reference = might be helpful >> for this statement. Perhaps [41] or [Morris185] from [41]. > ACK; Zahed also mentioned this and I think [41] is a good reference = because it includes some more context beyond just [Morris1985] alone, = and of course it includes reference to [Morris1985] itself as well. >=20 The ISN is relevant only during the TWHS; otherwise, it=E2=80=99s not. I = really wish we=E2=80=99d stop worrying so much about the ISN itself. I.e., ISNs aren=E2=80=99t the issue; being able to guess or hit *inside = the active window* is. That can happen two ways - knowing the ISN *or* having the sequence = numbers move through the whole number space. And the latter is not mitigated by any sort of magically unpredictable = ISN. Joe= --Apple-Mail=_CBF74DDF-8ACC-4658-8392-D759E3AB11F6 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8
On = Jan 7, 2022, at 12:12 PM, Wesley Eddy <wes@mti-systems.com>= wrote:

** Section 3.4.  Per =E2=80=9CThere =
are security issues that result if an off-path
attacker is able to predict or guess ISN values=E2=80=9D, a reference =
might be helpful
for this statement.  Perhaps [41] or [Morris185] from =
[41].

ACK; Zahed also mentioned this and I = think [41] is a good reference because it includes some more context = beyond just [Morris1985] alone, and of course it includes reference to = [Morris1985] itself as well.

The = ISN is relevant only during the TWHS; otherwise, it=E2=80=99s not. I = really wish we=E2=80=99d stop worrying so much about the ISN = itself.

I.e., ISNs aren=E2=80=99t = the issue; being able to guess or hit *inside the active window* is.

That can = happen two ways - knowing the ISN *or* having the sequence numbers move = through the whole number space.

And the latter is not mitigated by any = sort of magically unpredictable ISN.

Joe
= --Apple-Mail=_CBF74DDF-8ACC-4658-8392-D759E3AB11F6-- From nobody Sat Jan 8 09:47:02 2022 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 625293A195B; Sat, 8 Jan 2022 09:47:00 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.318 X-Spam-Level: X-Spam-Status: No, score=-1.318 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_NEUTRAL=0.779, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=strayalpha.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6Wz0TjobNdIG; Sat, 8 Jan 2022 09:46:57 -0800 (PST) Received: from server217-3.web-hosting.com (server217-3.web-hosting.com [198.54.115.226]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 35C6B3A1956; Sat, 8 Jan 2022 09:46:57 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=strayalpha.com; s=default; h=To:References:Message-Id:Cc:Date:In-Reply-To: From:Subject:Mime-Version:Content-Type:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=vi4i0xoH9N+MxMTYs0C2U3RDGH+HECqp1uG19FMtEb0=; b=x8vu69igOsZJy+OZyOmzt3f9sD 5mQTx2yMIKJQmhxApI8W4GhSs+5ScnfmC+OjhQf+2mDWMct+xaGlcxVdjk5eRMHoWvsq3B3TdMhxR DnTnwUAcywTh7lIvc9ztHN8sqh5Np9ZYS+hXDlff5Cbf9M0qp+2xPfXLnZTb6D9CbrvlDCvuotkSh NhbvkpSfHHFzoW5vALEtabbJl53MwJweUy5lgRPxlSzGcIXuK7BZzKjgcilImT6TzRBuDM+FRFJhy /pqjYZ2PA44HryRnqXwZG1IV3LI0fd0wogEupvWS+U+Zy694orm85UgPK9LA9/o9IbTzggIoufmLE CFflFz0Q==; Received: from cpe-172-114-237-88.socal.res.rr.com ([172.114.237.88]:50455 helo=smtpclient.apple) by server217.web-hosting.com with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1n6Fno-00AWVl-8W; Sat, 08 Jan 2022 12:46:56 -0500 Content-Type: multipart/alternative; boundary="Apple-Mail=_72B643BB-0412-4174-A41C-E508ED68B383" Mime-Version: 1.0 (Mac OS X Mail 15.0 \(3693.20.0.1.32\)) From: "touch@strayalpha.com" In-Reply-To: <9e0080c6-8540-c145-2fa6-c8ba82bdabce@mti-systems.com> Date: Sat, 8 Jan 2022 09:46:50 -0800 Cc: Zaheduzzaman Sarker , The IESG , draft-ietf-tcpm-rfc793bis@ietf.org, tcpm IETF list , tcpm-chairs@ietf.org Message-Id: <8E98D78D-1937-4F17-A1C9-CA36E3004E4D@strayalpha.com> References: <163234356267.14096.14587632428023214216@ietfa.amsl.com> <9e0080c6-8540-c145-2fa6-c8ba82bdabce@mti-systems.com> To: Wes Eddy X-Mailer: Apple Mail (2.3693.20.0.1.32) X-OutGoing-Spam-Status: No, score=-1.0 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server217.web-hosting.com X-AntiAbuse: Original Domain - ietf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - strayalpha.com X-Get-Message-Sender-Via: server217.web-hosting.com: authenticated_id: touch@strayalpha.com X-Authenticated-Sender: server217.web-hosting.com: touch@strayalpha.com X-Source: X-Source-Args: X-Source-Dir: X-From-Rewrite: unmodified, already matched Archived-At: Subject: Re: [tcpm] Zaheduzzaman Sarker's Discuss on draft-ietf-tcpm-rfc793bis-25: (with DISCUSS and COMMENT) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 08 Jan 2022 17:47:01 -0000 --Apple-Mail=_72B643BB-0412-4174-A41C-E508ED68B383 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 > On Jan 7, 2022, at 11:04 AM, Wesley Eddy wrote: >=20 >> I have some comments/questions below. By addressing those, I hope = will improve >> the document even better: >>=20 >> * Section 3.1 : says -- >> Note that the list of options may be shorter than the data = offset field >> might imply. The content of the header beyond the End-of-Option = option >> must be header padding (i.e., zero). >>=20 >> Should this be a normative MUST? > Great question ... The EOL option is a zero byte, and the first such = option should signal that the option list is over. So the receiver = shouldn't need to process or check any further bytes of options to see = if they're also properly zero'ed padding. >=20 > So, I wouldn't think this needs to be normative, since if it's not = followed, no harm should result. However, that leads to the question of = why it says they must be set to zero then. Maybe someone else from TCPM = has a better answer than "that's just what it's always said" ... To me, = it seems like it's a good thing to do, but maybe not really required. >=20 I don=E2=80=99t know the original reason, but there are at least three = candidates: A) because zeroes make it easy to check because they won=E2=80=99t = affect the TCP checksum further B) to avoid permitting a covert channel C) to avoid needing to add and check for NOPs - which are not zeroes, = thus need to be checked because they would affect the TCP checksum So yes, I think for at least these reasons it should be a MUST. Another = way to state this is that an EOL MAY be followed by one or more EOLs to = enable alignment of the payload, but MUST NOT be followed by any other = option. Joe= --Apple-Mail=_72B643BB-0412-4174-A41C-E508ED68B383 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8
On = Jan 7, 2022, at 11:04 AM, Wesley Eddy <wes@mti-systems.com>= wrote:

I have some comments/questions below. By addressing those, I =
hope will improve
the document even better:

* Section 3.1 : says --
     Note that the list of options may be shorter than the data offset =
field
     might imply. The content of the header beyond the End-of-Option =
option
     must be header padding (i.e., zero).

   Should this be a normative MUST?

Great = question ... The EOL option is a zero byte, and the first such option = should signal that the option list is over.  So the receiver = shouldn't need to process or check any further bytes of options to see = if they're also properly zero'ed padding.

So, I wouldn't think this needs to be = normative, since if it's not followed, no harm should result.  = However, that leads to the question of why it says they must be set to = zero then.  Maybe someone else from TCPM has a better answer than = "that's just what it's always said" ... To me, it seems like it's a good = thing to do, but maybe not really = required.

I= don=E2=80=99t know the original reason, but there are at least three = candidates:

A) because zeroes make it easy = to check because they won=E2=80=99t affect the TCP checksum = further
B) to avoid permitting a covert = channel
C) to avoid needing to add and check for = NOPs - which are not zeroes, thus need to be checked because they would = affect the TCP checksum

So yes, I think for at least these reasons it should be a = MUST. Another way to state this is that an EOL MAY be followed by one or = more EOLs to enable alignment of the payload, but MUST NOT be followed = by any other option.

Joe
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[66.61.72.87]) by smtp.gmail.com with ESMTPSA id v1sm3989930qtw.65.2022.01.09.20.02.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 09 Jan 2022 20:02:15 -0800 (PST) Content-Type: multipart/alternative; boundary="------------BO6z282WdDVI3qKTMljRwu1y" Message-ID: <6f6e7b90-081a-74b4-b329-8879addcb8c4@mti-systems.com> Date: Sun, 9 Jan 2022 23:02:12 -0500 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.4.1 Content-Language: en-US To: Benjamin Kaduk , The IESG Cc: draft-ietf-tcpm-rfc793bis@ietf.org, tcpm-chairs@ietf.org, tcpm@ietf.org, Michael Scharf References: <163236803976.28405.5643771942452620510@ietfa.amsl.com> From: Wesley Eddy In-Reply-To: <163236803976.28405.5643771942452620510@ietfa.amsl.com> Archived-At: Subject: Re: [tcpm] Benjamin Kaduk's Discuss on draft-ietf-tcpm-rfc793bis-25: (with DISCUSS and COMMENT) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 10 Jan 2022 04:02:27 -0000 This is a multi-part message in MIME format. --------------BO6z282WdDVI3qKTMljRwu1y Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Hello, I'm looping back on this thread, since we need to close the loop on the DISCUSS points, and address the other COMMENT contents.  Sorry for the rather slow response, but I've finally been able to process everything from your review: On 9/22/2021 11:34 PM, Benjamin Kaduk via Datatracker wrote: > Benjamin Kaduk has entered the following ballot position for > draft-ietf-tcpm-rfc793bis-25: Discuss > > ... > ---------------------------------------------------------------------- > DISCUSS: > ---------------------------------------------------------------------- > > Many thanks for taking on the task of producing a roll-up update for the > core TCP specification! I am sure it was a lot of work, but I am happy > to see it done. > > That said, I do have a few points that I would like to have a bit more > discussion on before the document is published; I'm happy to see that > Warren already linked to > https://www.ietf.org/blog/handling-iesg-ballot-positions/ on the topic > of what a DISCUSS position can (and cannot) mean. > > (1) We incorporate some long-standing enhancements that improve the > security and robustness of TCP (in particular, random ISN and protection > against off-path in-window attacks come to mind), but only at SHOULD or > MAY requirements level. > > For example, we currently say: > > A TCP implementation MUST use the above type of "clock" for clock- > driven selection of initial sequence numbers (MUST-8), and SHOULD > generate its Initial Sequence Numbers with the expression: > > ISN = M + F(localip, localport, remoteip, remoteport, secretkey) > > and: > > + RFC 5961 [37] section 5 describes a potential blind data > injection attack, and mitigation that implementations MAY > choose to include (MAY-12). TCP stacks that implement > RFC 5961 MUST add an input check that the ACK value is > [...] > > What prevents us from making a MUST-level requirement for randomized > ISNs? Is it just the fact that it was only a SHOULD in RFC 6528 and a > perception that promoting to a MUST would be incompatible with retaining > Internet Standard status? > > Likewise, what prevents using stronger normative language (e.g., MUST) > for the RFC 5961 protections? > > It seems to me that these mechanisms are of general applicability and > provide significant value for use of TCP on the internet, even though > they are not fully robust and do not use cryptographic mechanisms. If > there are scenarios where their use is harmful or even just not > applicable, that seems like an exceptional case that should get > documented so as to strengthen the general recommendation for the > non-exception cases. On this question, I don't know if you (Ben) agreed, but the final message I saw was from Joe: https://mailarchive.ietf.org/arch/msg/tcpm/vDCi0xAf1Iayzsb4BS6DwlW3nhY/ I think your question would be a good one to bring up in TCPM for future work, but the working group was trying to avoid such changes in this document. > > (2) I think this is just a process question to ensure that the IESG > knows what we are approving at Internet Standard maturity, though it > is certainly possible that I misunderstand the situation. > > In Section 3.7.3 we see the normative statement (SHLD-6) that "when the > when the effective MTU of an interface varies packet-to- packet, TCP > implementations SHOULD use the smallest effective MTU of the interface > to calculate the value to advertise in the MSS option". This seems to > originate in RFC 6691 (being obsoleted by this document), but RFC 6691 > is only an Informational document and has not had an opportunity to > "accumulate experience at Proposed Standard before progressing", to > paraphrase RFC 6410. > > Similarly, Section 3.9.2 has (SHLD-23) "Generally, an application SHOULD > NOT change the DiffServ field value during the course of a connection > (SHLD-23)." This is a bit harder to track down, as the DiffServ field > was not always known by that name. I actually failed to find a directly > analogous previous statement of this guidance (presumably my error), and > thus don't know if it had any experience at the PS level or not. > > RFC 6410 seems pretty clear that some revisions are okay in Internet > Standards without such "bake time" at PS, but it does seem like > something that should be done consciously rather than by accident. If I understood the thread earlier and results of the IESG telechat, this point could be cleared? > > (3) This is also a process point for explicit consideration by the IESG. > > Appendix A.2 appears to discuss a few (rare) scenarios in which the > technical mechanisms of this document fail catastrophically (e.g., > getting stuck in a SYN|ACK loop and failing to complete the handshake). > Does this meet the "resolved known design choices" and "no known > technical omission" bar required by RFC 2026 even for *proposed* > standard? > > (Note that RFC 2026 explicitly says that the IESG may waive this > requirement, at least for PS.) > > > (AFAICT one such scenario is reported at > https://www.rfc-editor.org/errata_search.php?eid=3305 , which the change > log for this document calls out as "not applicable due to other > changes"; I am not sure which "other changes" are intended, for this > case.) If I understood the thread earlier and results of the IESG telechat, this point could be cleared? > (4) Another point mostly just to get explicit IESG acknowledgment > (elevating one of Lars' comments to DISCUSS level, essentially). > > As the changelog (and gen-art reviewer!) notes: > > Early in the process of updating RFC 793, Scott Brim mentioned that > this should include a PERPASS/privacy review. This may be something > for the chairs or AD to request during WGLC or IETF LC. > > I don't see any evidence to suggest that such a review actually > occurred. Do we want to seek out such a targeted review before > progressing? If I understood the thread earlier and results of the IESG telechat, this point could be cleared? > ---------------------------------------------------------------------- > COMMENT: > ---------------------------------------------------------------------- > > Thank you for the editorial changes so that we now talk about "a TCP > implementation" or a "remote TCP peer" rather than just "a TCP" or > "a remote TCP"! > > Abstract > > It also updates RFC > 5961 by adding a small clarification in reset handling while in the > SYN-RECEIVED state. [...] > > I'm not sure I found what this clarification was; is SYN-RECEIVED the > correct state? The ad-hoc diff I constructed between RFC 793 and this > document shows identical text for the "If the RST bit is set" case when > currently in SYN-RECEIVED STATE. The only trick is that RFC 5961 has an inconsistency in that its Section 3.2 is first is talking about the change being applied in the synchronized states, but SYN-RECEIVED is one of the states that it applies to and is not technically a synchronized state. The clarification is to just not use that term (synchronized state) in the place where this logic is added. > > Section 3.1 > > Options: [TCP Option]; Options#Size == (DOffset-5)*32; present > only when DOffset > 5. > > My (later) nit-level notation comment aside, the given expression does > not seem to convey the size occupied by the options, but rather the > combined size of the options and the padding. True; in the working copy I've added "note that this size expression also includes any padding trailing the actual options present."  Does that make sense for you? > > Section 3.2 > > A TCP Option is one of: an End of Option List Option, a No-Operation > Option, or a Maximum Segment Size Option. > > The IANA registry lists some thirty-odd option kinds, so this sentence > just seems false without some additional qualifier ("defined by this > specification", etc.) True, in the working copy, I changed it to "A TCP Option in the mandatory option set". > > Section 3.4 > > In response to sending data the TCP endpoint will receive > acknowledgments. The following comparisons are needed to process the > acknowledgments. > [...] > SEG.SEQ = first sequence number of a segment > > SEG.LEN = the number of octets occupied by the data in the segment > (counting SYN and FIN) > > SEG.SEQ+SEG.LEN-1 = last sequence number of a segment > > It seems to me that this information from the incoming segment is not > part of processing the *acknowledgment*, but rather part of processing > the data received in that segment (a procedure discussed a few > paragraphs later). I see what you mean, though these are used in validating any segments, including pure acknowledgements. > > This clock is a 32-bit counter that typically increments at > least once every roughly 4 microseconds, [...] > Maximum Segment Lifetime (MSL), generated ISNs will be unique, since > it cycles approximately every 4.55 hours, which is much longer than > the MSL. > > Once we put in the "at least" we allow arbitrarily faster clock updates, > and that puts the "approximately every 4.55 hours" estimate in question. > Very fast clock updates would cycle correspondingly faster. Do we need > to place a lower limit on the clock update interval? (On first look, it > seems like we might not, since the keyed PRF F() is providing most of > the protection from off-path guessing, and an attacker can always use > direct connections to estimate the clock cycle interval. OTOH, if it > cycles so fast that it repeats within O(MSL), that might be problematic.) > > parameters and some secret data. For discussion of the selection of > a specific hash algorithm and management of the secret key data, > please see Section 3 of [41]. > > The guidance in the referenced document seems a bit dated (it indicates > that MD5 is probably still okay for this purpose). While the known > attacks on MD5 do not directly translate into an attack on ISN > generation, collisions can be found on as little as 64 bytes of input, > and all of the straightforward ways to use pure MD5 as a keyed hash for > this purpose have some undesirable properties. I'm happy to note that > FreeBSD is using siphash for this purpose, which should be more than > adequate. I expect that Linux and other major TCP stacks are already > doing something similar, so the guidance to use MD5 may be dated in > practice as well as in utility. > > I don't have a great proposal for where to put some updated guidance > (unless there's already some work underway in tcpm?); it is probably not > appropriate to put it inline here, so either an appendix or a separate > document seem plausible. What you say makes sense.  Properly updating RFC 6528 is something we can propose in TCPM based on your comments, which seems better to do in a separate document. > > Section 3.7.1 > > The MSS value to be sent in an MSS option should be equal to the > effective MTU minus the fixed IP and TCP headers. By ignoring both > IP and TCP options when calculating the value for the MSS option, if > there are any IP or TCP options to be sent in a packet, then the > sender must decrease the size of the TCP data accordingly. RFC 6691 > [42] discusses this in greater detail. > > I note that RFC 6691 is obsoleted by this document; it seems to me that > if we think there is useful content still in that document, we should > include such content in this document instead of referring to a document > we are calling obsolete. (This is not the only place we do so, to be > clear, but I will try to mention it just once. I do see the note that > we only claim to incorporate the normative portions of most of the > obsoleted specs, leaving the informational content alone.) Understood, though referencing is very little work and allows someone who is interested in more detail "why" to find it.  In contrast,  incorporating all this type of information into this document would be a lot more work, and that content would not be needed or really even of value for many readers. > > Section 3.8.4 > > An implementation SHOULD send a keep-alive segment with no data > (SHLD-12); however, it MAY be configurable to send a keep-alive > segment containing one garbage octet (MAY-6), for compatibility with > erroneous TCP implementations. > > Such misbehaved TCP impelementations were misbehaved even in 1989 when > RFC 1122 was published -- do we have a sense for whether they are still > around to any significant degree? That's a great question; I don't know, but would highly doubt they are around anymore (at least not in production on the Internet). > > Section 3.8.5 > > As a result of implementation differences and middlebox interactions, > new applications SHOULD NOT employ the TCP urgent mechanism (SHLD- > 13). However, TCP implementations MUST still include support for the > urgent mechanism (MUST-30). Details can be found in RFC 6093 [38]. > > This "SHOULD NOT employ" has been in force for over a decade (RFC 6093 > is dated January 2011). How long do we have to wait until there are > sufficiently few implementations employing the urgent mechanism that it > no longer needs to be implemented? When it was last looked at, there was at least one fairly prominent application that relied on it, though they could do so semi-safely because of being tied to an OS with the expected interpretation. > > Section 3.9.2.3 > > An incoming SYN with an invalid source address MUST be ignored > either by TCP or by the IP layer (MUST-63) (Section 3.2.1.3 of > [18]). > > Requirements of the form "A or B must do X" that are ambiguous about > whether A or B takes the action leave the risk that both will expect the > other party to take the action, and the action will fail to occur. If > we're in a position to specifically require one (or both!) to check, > that leads to a more robust and verifiable system. (I assume we're not > in such a position, but it can't hurt to check.) Great point.  I guess we hope IP would discard it, but in case not, TCP should.  If the implementation is handling both protocols at once (as in some small hosts), there might not be much distinction. > > Section 4 > > Destination Address > The network layer address of the remote endpoint. > [...] > Source Address > The network layer address of the sending endpoint. > > These definitions don't seem to work in the context of a receiver > validating the TCP checksum, where the destination address is the local > endpoint's address and the source address is the remote endpoint's > address. (I note that these definitions are different from what RFC 793 > itself used.) Interesting point on the destination (though the source one seems fine, it's always the sending endpoint).  Maybe we should just change "remote" to "receiving" in the destination one? > > receive window > This represents the sequence numbers the local (receiving) > TCP endpoint is willing to receive. Thus, the local TCP > endpoint considers that segments overlapping the range > RCV.NXT to RCV.NXT + RCV.WND - 1 carry acceptable data or > control. Segments containing sequence numbers entirely > outside of this range are considered duplicates and > discarded. > > Duplicates or injection attacks (when the sequence numbers in the > segment are too large). ACK, I added "or injection attacks" in the working copy. > > Section 5 > > The collection of applicable RFC Errata that have been reported and > either accepted or held for an update to RFC 793 were incorporated > (Errata IDs: 573, 574, 700, 701, 1283, 1561, 1562, 1564, 1565, 1571, > 1572, 2296, 2297, 2298, 2748, 2749, 2934, 3213, 3300, 3301, 6222). > Some errata were not applicable due to other changes (Errata IDs: > 572, 575, 1569, 3305, 3602). > > I think that EID 1565 belongs in the "not applicable due to other > changes" list, since the text it attempts to modify involves the > now-removed discussion of the IP "precedence" field. > > Similarly, EID 2296 also affected text about precedence and security > that is no longer present in a recognizable form. Good points, I've moved those in the working copy.  Originally they were fixed as described, but then other edits made them OBE. > > The more secure Initial Sequence Number generation algorithm from RFC > 6528 was incorporated. See RFC 6528 for discussion of the attacks > that this mitigates, as well as advice on selecting PRF algorithms > and managing secret key data. > > (As I mentioned up in §3.4, that guidance is no longer current.) Is updating 6528 agreed to be possible future work? > > Section 9.1 > > It's not clear to me that RFC 2675 ([5]) needs to be classified as > normative. Yeah, I don't have any concern with making it informative, if you think that's right? > > The guidance at > https://www.ietf.org/about/groups/iesg/statements/normative-informative-references/ > would suggest that RFC 5961 ([37]) should be classified as normative, > since we replicate its MUST-level requirements with the condition that > "TCP stacks that implement RFC 5961 MUST [...]", which would appear to > make that behavior an "optional feature". Ok; I've made it so in the working copy. > Appendix A.1.2 > > The IP security option (IPSO) and compartment defined in [1] was > refined in RFC 1038 that was later obsoleted by RFC 1108. The > Commercial IP Security Option (CIPSO) is defined in FIPS-188, and is > supported by some vendors and operating systems. RFC 1108 is now > > Should we mention that FIPS-188 is archived and withdrawn by NIST? > (I also didn't find much to define the actual IP option in the PDF I > found, > https://csrc.nist.gov/csrc/media/publications/fips/188/archive/1994-09-06/documents/fips188.pdf, > but I didn't look very hard.) In the working copy, I've added "(withdrawn by NIST in 2015)" after the mention of FIPS-188. > Appendix A.3 > > It's fascinating to me that the preferred reference for this modified > Nagle algorithm is an Internet-Draft from 1999, vs something more > recent. Me too! > Appendix B > > Every 2nd full-sized segment or 2*RMSS ACK'd | SHLD-19|x| | | | | > > This 'x' seems to be in the "MUST" column, not the "SHOULD" column. Thank you!  Fixed in working copy. > > Time Stamp support | MAY-10 | | |x| | | > > How do we square timestamp support being a "MAY" with SHLD-4, > SHOULD-level guidance to use timestamps to reduce TIME-WAIT? MAY-10 is the ***IP*** Timestamp option, and SHLD-4 is about the ***TCP*** Timestamp option. > > Time Exceeded => tell ALP, don't abort | MUST-56| | | | |x| > Param Problem => tell ALP, don't abort | MUST-56| | | | |x| > > Is there a double negative between "don't abort" and the 'x' being in > the "MUST NOT" column? Agreed, that is confusing.  In the working copy, I'll change both of those titles to "Abort on ..." > NITS > > I made essentially no attempt to de-duplicate the nit-level remarks > against the ballot positions from other ADs (in contrast to the other > comments, where I made some modest effort to de-duplicate). My > apologies for the extra work to ignore the already-fixed items. > > Section 1 > > For several decades, RFC 793 plus a number of other documents have > combined to serve as the core specification for TCP [48]. Over time, > a number of errata have been filed against RFC 793, as well as > deficiencies in security, performance, and many other aspects. The > > A naive parse would say that this means a number of errata have been > filed against deficiencies. I suspect the transition between errata and > deficiencies should refer to deficiencies having been "discovered" or > similar. Good point.  In the working copy, I've broke that into 2 sentences, in case you think this is more clear: Over time, a number of errata have been filed against RFC 793. There have also been deficiencies found and resolved in security, performance, and many other aspects. > The purpose of this document is to bring together all of the IETF > Standards Track changes that have been made to the base TCP > functional specification and unify them into an update of RFC 793. > > It's a little surprising to see this described as an "update of RFC 793" > (vs. a "replacement of" or "updated version of") since the relationship > is Obsoletes, not Updates. I might even consider "into a single > consolidated specification". Ok, I changed to "updated version of" in the working draft. > Section 3.1 > > Options: [TCP Option]; Options#Size == (DOffset-5)*32; present > only when DOffset > 5. > > The "Options#Size" notation seems confusing and is not using any > convention I'm aware of. It does not appear in RFC 793 or any other RFC > that I can find, either. This is changed now, as discussed in other threads. > Section 3.3.1 > > maintenance of a TCP connection requires the remembering of several > variables. We conceive of these variables being stored in a > > "the remembering of" is a fairly awkward phrase, where something like > just "remembering" or "maintaining state for" would flow more naturally. Ok, changed to "maintaining state for" in the working copy. > Section 3.4 > > It is essential to remember that the actual sequence number space is > finite, though very large. This space ranges from 0 to 2**32 - 1. > > The sense of scale in the broader ecosystem may have evolved out from > under us; QUIC's 62-bit sequence space might be more along the lines of > "very large" these days, with a 32-bit space being merely "large". Ok, removed "very" in the working copy. > > A connection is defined by a pair of sockets. Connections can be > > This is the first instance of the word "socket" in this document. > RFC 793 used the term much more prevalently, but this update has > (beneficially, IMO) moved away from that approach in favor of discussing > IP addresses and port numbers. Might such a change be appropriate here > as well? Regardless, we should probably have some introduction to what > we mean by "socket" if we are to retain any uses of the term, IMO, more > than just the glossary entry. Good point.  I think it will help to borrow the sentences below from 793 and put them into the section 2.2 on "Key TCP Concepts": To allow for many processes within a single host to use TCP communication facilities simultaneously, TCP provides a set of addresses or ports within each host. Concatenated with the network and host addresses from the internet communication layer, this forms a socket. > > verify this SYN. The three way handshake and the advantages of a > clock-driven scheme are discussed in [68]. > > I don't have access to the reference, but it's not clear from just it's > abstract whether "advantages of" or "advantages over" a clock-driven > scheme is the intended meaning. We could clarify as "advantages of a clock-driven scheme for ISN selection ...".  (I checked the paper and that's what it's referring to.) > explanation for this specification is given. TCP implementors may > violate the "quiet time" restriction, but only at the risk of causing > some old data to be accepted as new or new data rejected as old > duplicated by some receivers in the internet system. > > Maybe "old duplicated data"? The current phrasing feels like it's > missing a word. ACK, fixed in my working copy. > Hosts that prefer to avoid waiting are > willing to risk possible confusion of old and new packets at a given > destination may choose not to wait for the "quiet time". > > I think this needs an "and", for "prefer to avoid waiting and are > willing to risk". ACK, fixed in my working copy. > > To summarize: every segment emitted occupies one or more sequence > numbers in the sequence space, the numbers occupied by a segment are > "busy" or "in use" until MSL seconds have passed, upon rebooting a > block of space-time is occupied by the octets and SYN or FIN flags of > the last emitted segment, if a new connection is started too soon and > uses any of the sequence numbers in the space-time footprint of the > last segment of the previous connection incarnation, there is a > potential sequence number overlap area that could cause confusion at > the receiver. > > This list seems to be missing an "and". > (Also, is it really only the last emitted segment that could cause > problems?) ACK, fixed in my working copy.  You're right that it's not just the last segment, but any that could potentially still be in-flight. > > Section 3.5 > > It is the > implementation of a trade-off between memory and messages to provide > information for this checking. > > I'm not sure this reads well; is "the implementation of" needed? Ok, removed in working copy. > > If an incoming segment has a security level, or compartment that > does not exactly match the level and compartment requested for the > connection, a reset is sent and the connection goes to the CLOSED > state. The reset takes its sequence number from the ACK field of > > The comma in the first line is no longer needed (it was part of the list > when precedence was still part of the list). ACK, fixed in working copy. > Section 3.6 > > In this case, a FIN segment can be constructed and placed on the > outgoing segment queue. No further SENDs from the user will be > accepted by the TCP implementation, and it enters the FIN-WAIT-1 > state. RECEIVEs are allowed in this state. All segments > preceding and including FIN will be retransmitted until > acknowledged. When the other TCP peer has both acknowledged the > FIN and sent a FIN of its own, the first TCP peer can ACK this > FIN. Note that a TCP endpoint receiving a FIN will ACK but not > send its own FIN until its user has CLOSED the connection also. > > Naming the two peers (e.g., A and B) can help avoid awkward grammatical > constructions like "can ACK this FIN" and improve clarity. Unless you really think it's necessary, I prefer not to change this original 793 text, since it doesn't seem so bad to me. > Section 3.8 > > segments may arrive due to network or TCP retransmission. As > discussed in the section on sequence numbers the TCP implementation > performs certain tests on the sequence and acknowledgment numbers in > the segments to verify their acceptability. > > comma after "sequence number". ACK, fixed in working copy. > > Section 3.8.6.2.2 > > Note that the general effect of this algorithm is to advance RCV.WND > in increments of Eff.snd.MSS (for realistic receive buffers: > Eff.snd.MSS < RCV.BUFF/2). Note also that the receiver must use its > own Eff.snd.MSS, assuming it is the same as the sender's. > > I think the last sentence would be more clear if it was something like > "making the assumption that is the same" or "on the assumption that it > is the same". ACK, changed to your suggested "making the assumption" in my working copy. > Section 3.8.6.3 > > Note that there are several current practices that further lead to a > reduced number of ACKs, including generic receive offload (GRO), ACK > compression, and ACK decimation [26]. > > Reference [26] seems reasonable for ACK decimation and ACK compression, > but doesn't seem to cover GRO at all. True; do you think we should try to find a proper GRO reference? I'm not aware of there being a real standard or academic type of reference. > > Section 3.9.1 > > If the PUSH flag is set, the application intends the data to be > transmitted promptly to the receiver, and the PUSH bit will be > set in the last TCP segment created from the buffer. When an > application issues a series of SEND calls without setting the > PUSH flag, the TCP implementation MAY aggregate the data > internally without sending it (MAY-16). > > There's a dedicated paragraph a few paragraphs later for when the PUSH > flag is not set; the last sentence might flow better there. ACK.  Done in my working copy. > Some TCP implementations have included a FLUSH call, which will > empty the TCP send queue of any data that the user has issued > SEND calls but is still to the right of the current send > window. That is, it flushes as much queued send data as > > I think "has issued SEND calls for" (add "for"). ACK, fixed in my working copy. > Section 3.9.2 > > When received options are passed up to TCP from the IP layer, TCP > implementations MUST ignore options that it does not understand > (MUST-50). > > singular/plural mismatch (it/implementations) ACK, fixed in working copy. > > Section 3.9.2.2 > > Soft Errors > For ICMP these include: Destination Unreachable -- codes 0, 1, 5, > Time Exceeded -- codes 0, 1, and Parameter Problem. > > For ICMPv6 these include: Destination Unreachable -- codes 0 and 3, > Time Exceeded -- codes 0, 1, and Parameter Problem -- codes 0, 1, > 2. > > Since these Unreachable messages indicate soft error conditions, > > I'm not entirely sure that I'd classify "parameter problem" as an > "unreachable" message per se. I'm not sure I understand this comment.  This is the list from RFC 5461. > Section 3.10 > > Please note in the following that all arithmetic on sequence numbers, > acknowledgment numbers, windows, et cetera, is modulo 2**32 the size > of the sequence number space. Also note that "=<" means less than or > > Some punctuation around "the size of the sequence number space" seems in > order. ACK, added parenthesis in working copy. > equal to (modulo 2**32). > > [In formal mathematics this "less than or equal to, modulo N" operator > is not defined. But it's probably okay in this context.] Ok. > Section 3.10.1 > > the parameters of the incoming SYN segment. Verify the > security and DiffServ value requested are allowed for this > user, if not return "error: precedence not allowed" or "error: > security/compartment not allowed." If passive enter the LISTEN > > It's surprising for the error string to mention "precedence" when the > predicate is DiffServ value. This is a good point.  When the definition of those bits was changed, it doesn't seem like the error message indicated here was correspondingly changed. > > with "error: insufficient resources". If Foreign socket was > not specified, then return "error: remote socket unspecified". > > I suspect s/Foreign/remote/ was intended. (Also occurs later, but I > will just note it once here.) ACK, changed in my working copy.  Based on other comments, "foreign" in general was changed to "remote". > Section 3.10.3 > > - Since the remote side has already sent FIN, RECEIVEs must be > satisfied by data already on hand, but not yet delivered to the > user. If no text is awaiting delivery, the RECEIVE will get a > "error: connection closing" response. Otherwise, any remaining > text can be used to satisfy the RECEIVE. > > I think s/text/data/ should be applied on the last line (since it was > already applied on the second line). ACK, changed in my working copy. > > Section 3.10.7.4 > > o Segments are processed in sequence. Initial tests on > arrival are used to discard old duplicates, but further > processing is done in SEG.SEQ order. If a segment's > contents straddle the boundary between old and new, only the > new parts should be processed. > > Maybe s/should be/are/? There's not really optionality about it... ACK, changed in my working copy. > * If this connection was initiated with a passive OPEN > (i.e., came from the LISTEN state), then return this > connection to LISTEN state and return. The user need > not be informed. If this connection was initiated > with an active OPEN (i.e., came from SYN-SENT state) > then the connection was refused, signal the user > "connection refused". In either case, all segments on > the retransmission queue should be removed. And in > > IIUC, what's described here as "removed" is described elsewhere as > "flushed"; it would be good to use consistent terminology when possible. Do you have a strong preference? > + Once in the ESTABLISHED state, it is possible to deliver > segment text to user RECEIVE buffers. Text from segments > can be moved into buffers until either the buffer is full > or the segment is empty. If the segment empties and > [...] > > As above, it seems like (case-insensitive) s/test/data/ would improve > consistency. Changed to "data" in working copy. > > Section 4 > > internet datagram > The unit of data exchanged between an internet module and the > higher level protocol together with the internet header. > > "exchanged between an internet module and the higher level protocol" > sounds like a local operation; I would have expected the definition of > an *internet* datagram to involve transfer over the (inter)network. Ok, can you suggest an alternative definition?  I agree this one from the original 793 isn't terrific. > > segment length > The amount of sequence number space occupied by a segment, > including any controls that occupy sequence space. > > Should we say that this is a field in the segment header? I don't think so (it's not in the TCP header). > > URG > A control bit (urgent), occupying no sequence space, used to > indicate that the receiving user should be notified to do > urgent processing as long as there is data to be consumed > with sequence numbers less than the value indicated in the > urgent pointer. > > To me, "value indicated in" is synonymous with "value contained in", > which is problematic here since the urgent field is only 16 bits and > sequence numbers 32 bits. "indicated by" would be an improvement, > though of course if we're willing to spend more words we can increase > clarity further. ACK, changed to "indicated by" in my working copy. > > Appendix A.1 > > RFC 793 requires checking the IP security compartment and precedence > on incoming TCP segments for consistency within a connection, and > > I think the past tense "required" would be more appropriate upon > publication of this document as an RFC obsoleting RFC 793. > ACK, fixed in my working copy. --------------BO6z282WdDVI3qKTMljRwu1y Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit

Hello, I'm looping back on this thread, since we need to close the loop on the DISCUSS points, and address the other COMMENT contents.  Sorry for the rather slow response, but I've finally been able to process everything from your review:


On 9/22/2021 11:34 PM, Benjamin Kaduk via Datatracker wrote:
Benjamin Kaduk has entered the following ballot position for
draft-ietf-tcpm-rfc793bis-25: Discuss

...
----------------------------------------------------------------------
DISCUSS:
----------------------------------------------------------------------

Many thanks for taking on the task of producing a roll-up update for the
core TCP specification!  I am sure it was a lot of work, but I am happy
to see it done.

That said, I do have a few points that I would like to have a bit more
discussion on before the document is published; I'm happy to see that
Warren already linked to
https://www.ietf.org/blog/handling-iesg-ballot-positions/ on the topic
of what a DISCUSS position can (and cannot) mean.

(1) We incorporate some long-standing enhancements that improve the
security and robustness of TCP (in particular, random ISN and protection
against off-path in-window attacks come to mind), but only at SHOULD or
MAY requirements level.

For example, we currently say:

   A TCP implementation MUST use the above type of "clock" for clock-
   driven selection of initial sequence numbers (MUST-8), and SHOULD
   generate its Initial Sequence Numbers with the expression:

   ISN = M + F(localip, localport, remoteip, remoteport, secretkey)

and:

         +  RFC 5961 [37] section 5 describes a potential blind data
            injection attack, and mitigation that implementations MAY
            choose to include (MAY-12).  TCP stacks that implement
            RFC 5961 MUST add an input check that the ACK value is
            [...]

What prevents us from making a MUST-level requirement for randomized
ISNs?  Is it just the fact that it was only a SHOULD in RFC 6528 and a
perception that promoting to a MUST would be incompatible with retaining
Internet Standard status?

Likewise, what prevents using stronger normative language (e.g., MUST)
for the RFC 5961 protections?

It seems to me that these mechanisms are of general applicability and
provide significant value for use of TCP on the internet, even though
they are not fully robust and do not use cryptographic mechanisms.  If
there are scenarios where their use is harmful or even just not
applicable, that seems like an exceptional case that should get
documented so as to strengthen the general recommendation for the
non-exception cases.

On this question, I don't know if you (Ben) agreed, but the final message I saw was from Joe:

https://mailarchive.ietf.org/arch/msg/tcpm/vDCi0xAf1Iayzsb4BS6DwlW3nhY/

I think your question would be a good one to bring up in TCPM for future work, but the working group was trying to avoid such changes in this document.



(2) I think this is just a process question to ensure that the IESG
knows what we are approving at Internet Standard maturity, though it
is certainly possible that I misunderstand the situation.

In Section 3.7.3 we see the normative statement (SHLD-6) that "when the
when the effective MTU of an interface varies packet-to- packet, TCP
implementations SHOULD use the smallest effective MTU of the interface
to calculate the value to advertise in the MSS option".  This seems to
originate in RFC 6691 (being obsoleted by this document), but RFC 6691
is only an Informational document and has not had an opportunity to
"accumulate experience at Proposed Standard before progressing", to
paraphrase RFC 6410.

Similarly, Section 3.9.2 has (SHLD-23) "Generally, an application SHOULD
NOT change the DiffServ field value during the course of a connection
(SHLD-23)."  This is a bit harder to track down, as the DiffServ field
was not always known by that name.  I actually failed to find a directly
analogous previous statement of this guidance (presumably my error), and
thus don't know if it had any experience at the PS level or not.

RFC 6410 seems pretty clear that some revisions are okay in Internet
Standards without such "bake time" at PS, but it does seem like
something that should be done consciously rather than by accident.

If I understood the thread earlier and results of the IESG telechat, this point could be cleared?



(3) This is also a process point for explicit consideration by the IESG.

Appendix A.2 appears to discuss a few (rare) scenarios in which the
technical mechanisms of this document fail catastrophically (e.g.,
getting stuck in a SYN|ACK loop and failing to complete the handshake).
Does this meet the "resolved known design choices" and "no known
technical omission" bar required by RFC 2026 even for *proposed*
standard?

(Note that RFC 2026 explicitly says that the IESG may waive this
requirement, at least for PS.)


(AFAICT one such scenario is reported at
https://www.rfc-editor.org/errata_search.php?eid=3305 , which the change
log for this document calls out as "not applicable due to other
changes"; I am not sure which "other changes" are intended, for this
case.)

If I understood the thread earlier and results of the IESG telechat, this point could be cleared?



(4) Another point mostly just to get explicit IESG acknowledgment
(elevating one of Lars' comments to DISCUSS level, essentially).

As the changelog (and gen-art reviewer!) notes:

   Early in the process of updating RFC 793, Scott Brim mentioned that
   this should include a PERPASS/privacy review.  This may be something
   for the chairs or AD to request during WGLC or IETF LC.

I don't see any evidence to suggest that such a review actually
occurred.  Do we want to seek out such a targeted review before
progressing?

If I understood the thread earlier and results of the IESG telechat, this point could be cleared?



----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

Thank you for the editorial changes so that we now talk about "a TCP
implementation" or a "remote TCP peer" rather than just "a TCP" or
"a remote TCP"!

Abstract

                                                 It also updates RFC
   5961 by adding a small clarification in reset handling while in the
   SYN-RECEIVED state.  [...]

I'm not sure I found what this clarification was; is SYN-RECEIVED the
correct state?  The ad-hoc diff I constructed between RFC 793 and this
document shows identical text for the "If the RST bit is set" case when
currently in SYN-RECEIVED STATE.

The only trick is that RFC 5961 has an inconsistency in that its Section 3.2 is first is talking about the change being applied in the synchronized states, but SYN-RECEIVED is one of the states that it applies to and is not technically a synchronized state.  The clarification is to just not use that term (synchronized state) in the place where this logic is added.



Section 3.1

   Options: [TCP Option]; Options#Size == (DOffset-5)*32; present
   only when DOffset > 5.

My (later) nit-level notation comment aside, the given expression does
not seem to convey the size occupied by the options, but rather the
combined size of the options and the padding.

True; in the working copy I've added "note that this size expression also includes any padding trailing the actual options present."  Does that make sense for you?



Section 3.2

   A TCP Option is one of: an End of Option List Option, a No-Operation
   Option, or a Maximum Segment Size Option.

The IANA registry lists some thirty-odd option kinds, so this sentence
just seems false without some additional qualifier ("defined by this
specification", etc.)

True, in the working copy, I changed it to "A TCP Option in the mandatory option set".



Section 3.4

   In response to sending data the TCP endpoint will receive
   acknowledgments.  The following comparisons are needed to process the
   acknowledgments.
      [...]
      SEG.SEQ = first sequence number of a segment

      SEG.LEN = the number of octets occupied by the data in the segment
      (counting SYN and FIN)

      SEG.SEQ+SEG.LEN-1 = last sequence number of a segment

It seems to me that this information from the incoming segment is not
part of processing the *acknowledgment*, but rather part of processing
the data received in that segment (a procedure discussed a few
paragraphs later).

I see what you mean, though these are used in validating any segments, including pure acknowledgements.



             This clock is a 32-bit counter that typically increments at
   least once every roughly 4 microseconds, [...]
   Maximum Segment Lifetime (MSL), generated ISNs will be unique, since
   it cycles approximately every 4.55 hours, which is much longer than
   the MSL.

Once we put in the "at least" we allow arbitrarily faster clock updates,
and that puts the "approximately every 4.55 hours" estimate in question.
Very fast clock updates would cycle correspondingly faster.  Do we need
to place a lower limit on the clock update interval?  (On first look, it
seems like we might not, since the keyed PRF F() is providing most of
the protection from off-path guessing, and an attacker can always use
direct connections to estimate the clock cycle interval.  OTOH, if it
cycles so fast that it repeats within O(MSL), that might be problematic.)

   parameters and some secret data.  For discussion of the selection of
   a specific hash algorithm and management of the secret key data,
   please see Section 3 of [41].

The guidance in the referenced document seems a bit dated (it indicates
that MD5 is probably still okay for this purpose).  While the known
attacks on MD5 do not directly translate into an attack on ISN
generation, collisions can be found on as little as 64 bytes of input,
and all of the straightforward ways to use pure MD5 as a keyed hash for
this purpose have some undesirable properties.  I'm happy to note that
FreeBSD is using siphash for this purpose, which should be more than
adequate.  I expect that Linux and other major TCP stacks are already
doing something similar, so the guidance to use MD5 may be dated in
practice as well as in utility.

I don't have a great proposal for where to put some updated guidance
(unless there's already some work underway in tcpm?); it is probably not
appropriate to put it inline here, so either an appendix or a separate
document seem plausible.

What you say makes sense.  Properly updating RFC 6528 is something we can propose in TCPM based on your comments, which seems better to do in a separate document.



Section 3.7.1

   The MSS value to be sent in an MSS option should be equal to the
   effective MTU minus the fixed IP and TCP headers.  By ignoring both
   IP and TCP options when calculating the value for the MSS option, if
   there are any IP or TCP options to be sent in a packet, then the
   sender must decrease the size of the TCP data accordingly.  RFC 6691
   [42] discusses this in greater detail.

I note that RFC 6691 is obsoleted by this document; it seems to me that
if we think there is useful content still in that document, we should
include such content in this document instead of referring to a document
we are calling obsolete.  (This is not the only place we do so, to be
clear, but I will try to mention it just once.  I do see the note that
we only claim to incorporate the normative portions of most of the
obsoleted specs, leaving the informational content alone.)

Understood, though referencing is very little work and allows someone who is interested in more detail "why" to find it.  In contrast,  incorporating all this type of information into this document would be a lot more work, and that content would not be needed or really even of value for many readers.



Section 3.8.4

   An implementation SHOULD send a keep-alive segment with no data
   (SHLD-12); however, it MAY be configurable to send a keep-alive
   segment containing one garbage octet (MAY-6), for compatibility with
   erroneous TCP implementations.

Such misbehaved TCP impelementations were misbehaved even in 1989 when
RFC 1122 was published -- do we have a sense for whether they are still
around to any significant degree?

That's a great question; I don't know, but would highly doubt they are around anymore (at least not in production on the Internet).



Section 3.8.5

   As a result of implementation differences and middlebox interactions,
   new applications SHOULD NOT employ the TCP urgent mechanism (SHLD-
   13).  However, TCP implementations MUST still include support for the
   urgent mechanism (MUST-30).  Details can be found in RFC 6093 [38].

This "SHOULD NOT employ" has been in force for over a decade (RFC 6093
is dated January 2011).  How long do we have to wait until there are
sufficiently few implementations employing the urgent mechanism that it
no longer needs to be implemented?

When it was last looked at, there was at least one fairly prominent application that relied on it, though they could do so semi-safely because of being tied to an OS with the expected interpretation.



Section 3.9.2.3

      An incoming SYN with an invalid source address MUST be ignored
      either by TCP or by the IP layer (MUST-63) (Section 3.2.1.3 of
      [18]).

Requirements of the form "A or B must do X" that are ambiguous about
whether A or B takes the action leave the risk that both will expect the
other party to take the action, and the action will fail to occur.  If
we're in a position to specifically require one (or both!) to check,
that leads to a more robust and verifiable system.  (I assume we're not
in such a position, but it can't hurt to check.)

Great point.  I guess we hope IP would discard it, but in case not, TCP should.  If the implementation is handling both protocols at once (as in some small hosts), there might not be much distinction.



Section 4

   Destination Address
           The network layer address of the remote endpoint.
   [...]
   Source Address
           The network layer address of the sending endpoint.

These definitions don't seem to work in the context of a receiver
validating the TCP checksum, where the destination address is the local
endpoint's address and the source address is the remote endpoint's
address.  (I note that these definitions are different from what RFC 793
itself used.)

Interesting point on the destination (though the source one seems fine, it's always the sending endpoint).  Maybe we should just change "remote" to "receiving" in the destination one?



   receive window
           This represents the sequence numbers the local (receiving)
           TCP endpoint is willing to receive.  Thus, the local TCP
           endpoint considers that segments overlapping the range
           RCV.NXT to RCV.NXT + RCV.WND - 1 carry acceptable data or
           control.  Segments containing sequence numbers entirely
           outside of this range are considered duplicates and
           discarded.

Duplicates or injection attacks (when the sequence numbers in the
segment are too large).

ACK, I added "or injection attacks" in the working copy.



Section 5

   The collection of applicable RFC Errata that have been reported and
   either accepted or held for an update to RFC 793 were incorporated
   (Errata IDs: 573, 574, 700, 701, 1283, 1561, 1562, 1564, 1565, 1571,
   1572, 2296, 2297, 2298, 2748, 2749, 2934, 3213, 3300, 3301, 6222).
   Some errata were not applicable due to other changes (Errata IDs:
   572, 575, 1569, 3305, 3602).

I think that EID 1565 belongs in the "not applicable due to other
changes" list, since the text it attempts to modify involves the
now-removed discussion of the IP "precedence" field.

Similarly, EID 2296 also affected text about precedence and security
that is no longer present in a recognizable form.

Good points, I've moved those in the working copy.  Originally they were fixed as described, but then other edits made them OBE.



   The more secure Initial Sequence Number generation algorithm from RFC
   6528 was incorporated.  See RFC 6528 for discussion of the attacks
   that this mitigates, as well as advice on selecting PRF algorithms
   and managing secret key data.

(As I mentioned up in §3.4, that guidance is no longer current.)

Is updating 6528 agreed to be possible future work?



Section 9.1

It's not clear to me that RFC 2675 ([5]) needs to be classified as
normative.

Yeah, I don't have any concern with making it informative, if you think that's right?



The guidance at
https://www.ietf.org/about/groups/iesg/statements/normative-informative-references/
would suggest that RFC 5961 ([37]) should be classified as normative,
since we replicate its MUST-level requirements with the condition that
"TCP stacks that implement RFC 5961 MUST [...]", which would appear to
make that behavior an "optional feature".

Ok; I've made it so in the working copy.


Appendix A.1.2

   The IP security option (IPSO) and compartment defined in [1] was
   refined in RFC 1038 that was later obsoleted by RFC 1108.  The
   Commercial IP Security Option (CIPSO) is defined in FIPS-188, and is
   supported by some vendors and operating systems.  RFC 1108 is now

Should we mention that FIPS-188 is archived and withdrawn by NIST?
(I also didn't find much to define the actual IP option in the PDF I
found,
https://csrc.nist.gov/csrc/media/publications/fips/188/archive/1994-09-06/documents/fips188.pdf,
but I didn't look very hard.)

In the working copy, I've added "(withdrawn by NIST in 2015)" after the mention of FIPS-188.


Appendix A.3

It's fascinating to me that the preferred reference for this modified
Nagle algorithm is an Internet-Draft from 1999, vs something more
recent.

Me too!


Appendix B

     Every 2nd full-sized segment or 2*RMSS ACK'd | SHLD-19|x| | | | |

This 'x' seems to be in the "MUST" column, not the "SHOULD" column.

Thank you!  Fixed in working copy.



   Time Stamp support                             | MAY-10 | | |x| | |

How do we square timestamp support being a "MAY" with SHLD-4,
SHOULD-level guidance to use timestamps to reduce TIME-WAIT?

MAY-10 is the ***IP*** Timestamp option, and SHLD-4 is about the ***TCP*** Timestamp option.



   Time Exceeded => tell ALP, don't abort         | MUST-56| | | | |x|
   Param Problem => tell ALP, don't abort         | MUST-56| | | | |x|

Is there a double negative between "don't abort" and the 'x' being in
the "MUST NOT" column?

Agreed, that is confusing.  In the working copy, I'll change both of those titles to "Abort on ..."


NITS

I made essentially no attempt to de-duplicate the nit-level remarks
against the ballot positions from other ADs (in contrast to the other
comments, where I made some modest effort to de-duplicate).  My
apologies for the extra work to ignore the already-fixed items.

Section 1

   For several decades, RFC 793 plus a number of other documents have
   combined to serve as the core specification for TCP [48].  Over time,
   a number of errata have been filed against RFC 793, as well as
   deficiencies in security, performance, and many other aspects.  The

A naive parse would say that this means a number of errata have been
filed against deficiencies.  I suspect the transition between errata and
deficiencies should refer to deficiencies having been "discovered" or
similar.

Good point.  In the working copy, I've broke that into 2 sentences, in case you think this is more clear:

Over time, a number of errata have been filed against RFC 793.  There have also been deficiencies found and resolved in security, performance, and many other aspects. 


   The purpose of this document is to bring together all of the IETF
   Standards Track changes that have been made to the base TCP
   functional specification and unify them into an update of RFC 793.

It's a little surprising to see this described as an "update of RFC 793"
(vs. a "replacement of" or "updated version of") since the relationship
is Obsoletes, not Updates.  I might even consider "into a single
consolidated specification".

Ok, I changed to "updated version of" in the working draft.


Section 3.1

   Options: [TCP Option]; Options#Size == (DOffset-5)*32; present
   only when DOffset > 5.

The "Options#Size" notation seems confusing and is not using any
convention I'm aware of.  It does not appear in RFC 793 or any other RFC
that I can find, either.

This is changed now, as discussed in other threads.


Section 3.3.1

   maintenance of a TCP connection requires the remembering of several
   variables.  We conceive of these variables being stored in a

"the remembering of" is a fairly awkward phrase, where something like
just "remembering" or "maintaining state for" would flow more naturally.

Ok, changed to "maintaining state for" in the working copy.


Section 3.4

   It is essential to remember that the actual sequence number space is
   finite, though very large.  This space ranges from 0 to 2**32 - 1.

The sense of scale in the broader ecosystem may have evolved out from
under us; QUIC's 62-bit sequence space might be more along the lines of
"very large" these days, with a 32-bit space being merely "large".

Ok, removed "very" in the working copy.



   A connection is defined by a pair of sockets.  Connections can be

This is the first instance of the word "socket" in this document.
RFC 793 used the term much more prevalently, but this update has
(beneficially, IMO) moved away from that approach in favor of discussing
IP addresses and port numbers.  Might such a change be appropriate here
as well?  Regardless, we should probably have some introduction to what
we mean by "socket" if we are to retain any uses of the term, IMO, more
than just the glossary entry.

Good point.  I think it will help to borrow the sentences below from 793 and put them into the section 2.2 on "Key TCP Concepts":

    To allow for many processes within a single host to use TCP
    communication facilities simultaneously, TCP provides a set of
    addresses or ports within each host.  Concatenated with the network
    and host addresses from the internet communication layer, this forms
    a socket. 



   verify this SYN.  The three way handshake and the advantages of a
   clock-driven scheme are discussed in [68].

I don't have access to the reference, but it's not clear from just it's
abstract whether "advantages of" or "advantages over" a clock-driven
scheme is the intended meaning.

We could clarify as "advantages of a clock-driven scheme for ISN selection ...".  (I checked the paper and that's what it's referring to.)


   explanation for this specification is given.  TCP implementors may
   violate the "quiet time" restriction, but only at the risk of causing
   some old data to be accepted as new or new data rejected as old
   duplicated by some receivers in the internet system.

Maybe "old duplicated data"?  The current phrasing feels like it's
missing a word.

ACK, fixed in my working copy.


                                Hosts that prefer to avoid waiting are
   willing to risk possible confusion of old and new packets at a given
   destination may choose not to wait for the "quiet time".

I think this needs an "and", for "prefer to avoid waiting and are
willing to risk".

ACK, fixed in my working copy.



   To summarize: every segment emitted occupies one or more sequence
   numbers in the sequence space, the numbers occupied by a segment are
   "busy" or "in use" until MSL seconds have passed, upon rebooting a
   block of space-time is occupied by the octets and SYN or FIN flags of
   the last emitted segment, if a new connection is started too soon and
   uses any of the sequence numbers in the space-time footprint of the
   last segment of the previous connection incarnation, there is a
   potential sequence number overlap area that could cause confusion at
   the receiver.

This list seems to be missing an "and".
(Also, is it really only the last emitted segment that could cause
problems?)

ACK, fixed in my working copy.  You're right that it's not just the last segment, but any that could potentially still be in-flight.



Section 3.5

                                                             It is the
   implementation of a trade-off between memory and messages to provide
   information for this checking.

I'm not sure this reads well; is "the implementation of" needed?

Ok, removed in working copy.



      If an incoming segment has a security level, or compartment that
      does not exactly match the level and compartment requested for the
      connection, a reset is sent and the connection goes to the CLOSED
      state.  The reset takes its sequence number from the ACK field of

The comma in the first line is no longer needed (it was part of the list
when precedence was still part of the list).

ACK, fixed in working copy.


Section 3.6

      In this case, a FIN segment can be constructed and placed on the
      outgoing segment queue.  No further SENDs from the user will be
      accepted by the TCP implementation, and it enters the FIN-WAIT-1
      state.  RECEIVEs are allowed in this state.  All segments
      preceding and including FIN will be retransmitted until
      acknowledged.  When the other TCP peer has both acknowledged the
      FIN and sent a FIN of its own, the first TCP peer can ACK this
      FIN.  Note that a TCP endpoint receiving a FIN will ACK but not
      send its own FIN until its user has CLOSED the connection also.

Naming the two peers (e.g., A and B) can help avoid awkward grammatical
constructions like "can ACK this FIN" and improve clarity.

Unless you really think it's necessary, I prefer not to change this original 793 text, since it doesn't seem so bad to me.


Section 3.8

   segments may arrive due to network or TCP retransmission.  As
   discussed in the section on sequence numbers the TCP implementation
   performs certain tests on the sequence and acknowledgment numbers in
   the segments to verify their acceptability.

comma after "sequence number".

ACK, fixed in working copy.



Section 3.8.6.2.2

   Note that the general effect of this algorithm is to advance RCV.WND
   in increments of Eff.snd.MSS (for realistic receive buffers:
   Eff.snd.MSS < RCV.BUFF/2).  Note also that the receiver must use its
   own Eff.snd.MSS, assuming it is the same as the sender's.

I think the last sentence would be more clear if it was something like
"making the assumption that is the same" or "on the assumption that it
is the same".

ACK, changed to your suggested "making the assumption" in my working copy.


Section 3.8.6.3

   Note that there are several current practices that further lead to a
   reduced number of ACKs, including generic receive offload (GRO), ACK
   compression, and ACK decimation [26].

Reference [26] seems reasonable for ACK decimation and ACK compression,
but doesn't seem to cover GRO at all.

True; do you think we should try to find a proper GRO reference?  I'm not aware of there being a real standard or academic type of reference.



Section 3.9.1

         If the PUSH flag is set, the application intends the data to be
         transmitted promptly to the receiver, and the PUSH bit will be
         set in the last TCP segment created from the buffer.  When an
         application issues a series of SEND calls without setting the
         PUSH flag, the TCP implementation MAY aggregate the data
         internally without sending it (MAY-16).

There's a dedicated paragraph a few paragraphs later for when the PUSH
flag is not set; the last sentence might flow better there.

ACK.  Done in my working copy.


         Some TCP implementations have included a FLUSH call, which will
         empty the TCP send queue of any data that the user has issued
         SEND calls but is still to the right of the current send
         window.  That is, it flushes as much queued send data as

I think "has issued SEND calls for" (add "for").

ACK, fixed in my working copy.


Section 3.9.2

   When received options are passed up to TCP from the IP layer, TCP
   implementations MUST ignore options that it does not understand
   (MUST-50).

singular/plural mismatch (it/implementations)

ACK, fixed in working copy.



Section 3.9.2.2

   Soft Errors
     For ICMP these include: Destination Unreachable -- codes 0, 1, 5,
     Time Exceeded -- codes 0, 1, and Parameter Problem.

     For ICMPv6 these include: Destination Unreachable -- codes 0 and 3,
     Time Exceeded -- codes 0, 1, and Parameter Problem -- codes 0, 1,
     2.

     Since these Unreachable messages indicate soft error conditions,

I'm not entirely sure that I'd classify "parameter problem" as an
"unreachable" message per se.

I'm not sure I understand this comment.  This is the list from RFC 5461.


Section 3.10

   Please note in the following that all arithmetic on sequence numbers,
   acknowledgment numbers, windows, et cetera, is modulo 2**32 the size
   of the sequence number space.  Also note that "=<" means less than or

Some punctuation around "the size of the sequence number space" seems in
order.

ACK, added parenthesis in working copy.


   equal to (modulo 2**32).

[In formal mathematics this "less than or equal to, modulo N" operator
is not defined.  But it's probably okay in this context.]

Ok.


Section 3.10.1

         the parameters of the incoming SYN segment.  Verify the
         security and DiffServ value requested are allowed for this
         user, if not return "error: precedence not allowed" or "error:
         security/compartment not allowed."  If passive enter the LISTEN

It's surprising for the error string to mention "precedence" when the
predicate is DiffServ value.

This is a good point.  When the definition of those bits was changed, it doesn't seem like the error message indicated here was correspondingly changed.



         with "error: insufficient resources".  If Foreign socket was
         not specified, then return "error: remote socket unspecified".

I suspect s/Foreign/remote/ was intended.  (Also occurs later, but I
will just note it once here.)

ACK, changed in my working copy.  Based on other comments, "foreign" in general was changed to "remote".


Section 3.10.3

      -  Since the remote side has already sent FIN, RECEIVEs must be
         satisfied by data already on hand, but not yet delivered to the
         user.  If no text is awaiting delivery, the RECEIVE will get a
         "error: connection closing" response.  Otherwise, any remaining
         text can be used to satisfy the RECEIVE.

I think s/text/data/ should be applied on the last line (since it was
already applied on the second line).

ACK, changed in my working copy.



Section 3.10.7.4

   o  Segments are processed in sequence.  Initial tests on
      arrival are used to discard old duplicates, but further
      processing is done in SEG.SEQ order.  If a segment's
      contents straddle the boundary between old and new, only the
      new parts should be processed.

Maybe s/should be/are/?  There's not really optionality about it...

ACK, changed in my working copy.


            *  If this connection was initiated with a passive OPEN
               (i.e., came from the LISTEN state), then return this
               connection to LISTEN state and return.  The user need
               not be informed.  If this connection was initiated
               with an active OPEN (i.e., came from SYN-SENT state)
               then the connection was refused, signal the user
               "connection refused".  In either case, all segments on
               the retransmission queue should be removed.  And in

IIUC, what's described here as "removed" is described elsewhere as
"flushed"; it would be good to use consistent terminology when possible.

Do you have a strong preference?


         +  Once in the ESTABLISHED state, it is possible to deliver
            segment text to user RECEIVE buffers.  Text from segments
            can be moved into buffers until either the buffer is full
            or the segment is empty.  If the segment empties and
            [...]

As above, it seems like (case-insensitive) s/test/data/ would improve
consistency.

Changed to "data" in working copy.



Section 4

   internet datagram
           The unit of data exchanged between an internet module and the
           higher level protocol together with the internet header.

"exchanged between an internet module and the higher level protocol"
sounds like a local operation; I would have expected the definition of
an *internet* datagram to involve transfer over the (inter)network.

Ok, can you suggest an alternative definition?  I agree this one from the original 793 isn't terrific.



   segment length
           The amount of sequence number space occupied by a segment,
           including any controls that occupy sequence space.

Should we say that this is a field in the segment header?

I don't think so (it's not in the TCP header).



   URG
           A control bit (urgent), occupying no sequence space, used to
           indicate that the receiving user should be notified to do
           urgent processing as long as there is data to be consumed
           with sequence numbers less than the value indicated in the
           urgent pointer.

To me, "value indicated in" is synonymous with "value contained in",
which is problematic here since the urgent field is only 16 bits and
sequence numbers 32 bits.  "indicated by" would be an improvement,
though of course if we're willing to spend more words we can increase
clarity further.
ACK, changed to "indicated by" in my working copy.


Appendix A.1

   RFC 793 requires checking the IP security compartment and precedence
   on incoming TCP segments for consistency within a connection, and

I think the past tense "required" would be more appropriate upon
publication of this document as an RFC obsoleting RFC 793.
ACK, fixed in my working copy. 

  


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Subject: Re: [tcpm] [EXTERNAL] Re:  hystart++
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Hi Neal and Randall,



We implemented the suggested "set cssBaseLineMinRTT to (lastRoundMinRtt + R=
ttThresh)" and we did an A/B test over our own emulated WAN test cases. We =
noticed that there's a regression in scenarios with latency jitters as you =
can see in the below graph. Mitigating spurious Hystart exit was why we inv=
ented CSS. Based on these results we concluded that the current draft algor=
ithm is the better choice.



This is how we define test cases:

100ms,100Mbps,1250pkt,64000B,2000,50jitms,5jitdiv

=3D>

100ms RTT, 100Mbps bottleneck bandwidth, bottleneck queue length 1250 packe=
ts, IO size 64KB, IO count 2000, 50ms latency jitter, 1/5 jitter probabilit=
y per packet





[cid:a108063c-37fa-402f-b920-c116fab108e9]



>> One option would be to track the maximum number of packets delivered in =
a round of slow-start (slowStartMaxDeliveredPackets), and only check for sp=
urious Hystart++ exits if the most recent round of >> CSS has at least slow=
StartMaxDeliveredPackets delivered. Something like:

>>- if (currentRoundDeliveredPackets >=3D slowStartMaxDeliveredPackets &&

>>      currentRoundMinRTT < cssBaselineMinRtt)

>>

>>         o  cssBaselineMinRtt =3D infinity

>>

>>         o  resume slow start including HyStart++



We have not tried this but it requires rounds to be well aligned with RTTs.=
 E.g. if one round takes about 2 RTTs and the other round takes 0.5 RTT, it=
 won't consistently work.



Thanks,



Yi

________________________________
From: tcpm  on behalf of Randall Stewart 
Sent: Thursday, December 2, 2021 12:08 PM
To: Neal Cardwell 
Cc: tcpm@ietf.org ; Randall Stewart 
Subject: [EXTERNAL] Re: [tcpm] hystart++

[Some people who received this message don't often get email from rrs=3D40n=
etflix.com@dmarc.ietf.org. Learn why this is important at http://aka.ms/Lea=
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Neal:

Great observation!!

> On Dec 2, 2021, at 2:43 PM, Neal Cardwell  wrote:
>
> Thanks, Randall. That's a nice analysis, and I agree that your proposal s=
ounds like a nice improvement.
>
> This nice analysis brings to mind another potential (related) issue that =
might cause spurious oscillations: after Hystart++ exits slow-start, if the=
re are application-limited periods where the amount of data in flight falls=
 below the BDP (e.g. flow goes idle and then restarts), then we would expec=
t the currentRoundMinRTT to be very low, triggering a resumption of slow-st=
art in the current logic, even if the Hystart++ exit of slow-start was corr=
ect.
>

I have actually seen this occur.. in fact I was wondering how I was going t=
o test
dropping back out in my lab (was thinking packet drill) and then my logging=
 noted
that it had happened.. and it was because nginx had taken a 25ms break in a=
pplying
data .. RTT was 20ms so the whole network went idle by the time the buffer =
was refilled and
thus a bounce out and back in later :)

> It seems that the connection should not use a data ACK's RTT sample to es=
timate whether Hystart++ exit was spurious unless the amount of data in fli=
ght at the time that data was sent was "sufficiently large". How to define =
"sufficiently large" may be a little tricky (the cwnd is probably not a goo=
d gauge for "sufficiently large" since it is probably somewhere out beyond =
twice the BDP in CSS).
>

Yeah I was wondering if we might not want to adjust exit based on some othe=
r
metric in app limited cases...

> One option would be to track the maximum number of packets delivered in a=
 round of slow-start (slowStartMaxDeliveredPackets), and only check for spu=
rious Hystart++ exits if the most recent round of CSS has at least slowStar=
tMaxDeliveredPackets delivered. Something like:
>
> - if (currentRoundDeliveredPackets >=3D slowStartMaxDeliveredPackets &&
>       currentRoundMinRTT < cssBaselineMinRtt)
>
>          o  cssBaselineMinRtt =3D infinity
>
>          o  resume slow start including HyStart++


That sounds like a very good adjustment.. I will maybe prototype it in my
lab and see if I can recreate the bounce I saw and see how well it works ;)

Best

R

>
> best regards,
> neal
>
>
>
>
>
>
> On Thu, Dec 2, 2021 at 1:46 PM Randall Stewart  wrote:
> Greetings all:
>
> I have implemented hystart++ off of the draft-03 for FreeBSD
> (both newreno and cubic) and I have noted one thing that I think
> is a bug in the spec:
>
> Draft-03 currently says:
>
>
>
>         o  if (currentRoundMinRTT >=3D (lastRoundMinRTT + RttThresh))
>
>            +  cssBaselineMinRtt =3D currentRoundMinRTT
>
>            +  exit slow start and enter CSS
>
>
> 
>
>
>
>      -  if (currentRoundMinRTT < cssBaselineMinRtt)
>
>         o  cssBaselineMinRtt =3D infinity
>
>         o  resume slow start including HyStart++
>
>
>
> But notice that the threshold for entering CSS is (lastRoundMinRtt + RttT=
hresh) and
> the exiting of CSS back to Slow Start is (currentRoundMinRTT < cssBaseLin=
eMinRTT), which can
> under the right circumstances set up an oscillation. In the case I observ=
ed I saw lastRoundMinRtt set
> to like 63ms and currentRoundMinRtt set at 115ms. And the next RTT in was=
 114ms.. so out of
> CSS into Slow Start, but the next measurement (114ms again) pushes you ba=
ck into CSS since
> the lastRoundMinRTT + RttThresh is around 63ms or so.
>
> I would think what you really want here is to set cssBaseLineMinRTT to (l=
astRoundMinRtt + RttThresh).
>
> I.e. on entry:
>
>
>         o  if (currentRoundMinRTT >=3D (lastRoundMinRTT + RttThresh))
>
>            +  cssBaselineMinRtt =3D (lastRoundMinRtt + RttThresh)
>
>            +  exit slow start and enter CSS
>
> R
>
> ------
> Randall Stewart
> rrs@netflix.com
>
>
>
> _______________________________________________
> tcpm mailing list
> tcpm@ietf.org
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------
Randall Stewart
rrs@netflix.com




--_000_PH0PR00MB1331786C9CC3A5721EEBC1E2C3529PH0PR00MB1331namp_
Content-Type: text/html; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable













Hi Neal and&nbs=
p;Randall,





 







We implemented the suggested &qu=
ot;set cssBaseLineMinRTT to (lastRoundMinRtt + RttThresh)" and we did =
an A/B test over our own emulated WAN test cases. We noticed that there's a=
 regression in scenarios with latency jitters
 as you can see in the below graph. Mitigating spurious Hystart exit was wh=
y we invented CSS. Based
 on these results we concluded that the current draft algorithm is the bett=
er choice.







 







This is how we define test cases=
:







100ms,100Mbps,1250pkt,64000B,200=
0,50jitms,5jitdiv







=3D>







100ms RTT, 100Mbps bottleneck ba=
ndwidth, bottleneck queue length 1250 packets, IO size 64KB, IO count 2000,=
 50ms latency jitter, 1/5 jitter probability per packet







 







 













 







>> One option would be to =
track the maximum number of packets delivered in a round of slow-start (slo=
wStartMaxDeliveredPackets), and only check for spurious Hystart++ exits if =
the most recent round of >> CSS has at least
 slowStartMaxDeliveredPackets delivered. Something like:







>>- if (currentRoundDelive=
redPackets >=3D slowStartMaxDeliveredPackets &&





>>      cur=
rentRoundMinRTT < cssBaselineMinRtt)







>> 







>>      &nb=
sp;  o  cssBaselineMinRtt =3D infinity







>> 





>>      &nb=
sp;  o  resume slow start including HyStart++







 







We have
 not tried this but it requires rounds to be well aligned with RTTs. E.g. i=
f one round takes about 2 RTTs and the other round takes 0.5 RTT, it won't =
consistently work.







 







Thanks,







 







Yi














From: tcpm <tcpm-bounc=
es@ietf.org> on behalf of Randall Stewart <rrs=3D40netflix.com@dmarc.=
ietf.org>

Sent: Thursday, December 2, 2021 12:08 PM

To: Neal Cardwell <ncardwell=3D40google.com@dmarc.ietf.org>
Cc: tcpm@ietf.org <tcpm@ietf.org>; Randall Stewart <rrs=3D4=
0netflix.com@dmarc.ietf.org>

Subject: [EXTERNAL] Re: [tcpm] hystart++

 






[Some people who received this message don't often=
 get email from rrs=3D40netflix.com@dmarc.ietf.org. Learn why this is impor=
tant at
http://aka.ms/Le=
arnAboutSenderIdentification.]



Neal:



Great observation!!



> On Dec 2, 2021, at 2:43 PM, Neal Cardwell <ncardwell=3D40google.com=
@dmarc.ietf.org> wrote:

>

> Thanks, Randall. That's a nice analysis, and I agree that your proposa=
l sounds like a nice improvement.

>

> This nice analysis brings to mind another potential (related) issue th=
at might cause spurious oscillations: after Hystart++ exits slow-start, if =
there are application-limited periods where the amount of data in flight fa=
lls below the BDP (e.g. flow goes idle
 and then restarts), then we would expect the currentRoundMinRTT to be very=
 low, triggering a resumption of slow-start in the current logic, even if t=
he Hystart++ exit of slow-start was correct.

>



I have actually seen this occur.. in fact I was wondering how I was going t=
o test

dropping back out in my lab (was thinking packet drill) and then my logging=
 noted

that it had happened.. and it was because nginx had taken a 25ms break in a=
pplying

data .. RTT was 20ms so the whole network went idle by the time the buffer =
was refilled and

thus a bounce out and back in later :)



> It seems that the connection should not use a data ACK's RTT sample to=
 estimate whether Hystart++ exit was spurious unless the amount of data in =
flight at the time that data was sent was "sufficiently large". H=
ow to define "sufficiently large" may be a little
 tricky (the cwnd is probably not a good gauge for "sufficiently large=
" since it is probably somewhere out beyond twice the BDP in CSS).

>



Yeah I was wondering if we might not want to adjust exit based on some othe=
r

metric in app limited cases...



> One option would be to track the maximum number of packets delivered i=
n a round of slow-start (slowStartMaxDeliveredPackets), and only check for =
spurious Hystart++ exits if the most recent round of CSS has at least slowS=
tartMaxDeliveredPackets delivered.
 Something like:

>

> - if (currentRoundDeliveredPackets >=3D slowStartMaxDeliveredPacket=
s &&

>       currentRoundMinRTT < cssBaselin=
eMinRtt)

>

>          o  cssBasel=
ineMinRtt =3D infinity

>

>          o  resume s=
low start including HyStart++





That sounds like a very good adjustment.. I will maybe prototype it in my
lab and see if I can recreate the bounce I saw and see how well it works ;)=




Best



R



>

> best regards,

> neal

>

>

>

>

>

>

> On Thu, Dec 2, 2021 at 1:46 PM Randall Stewart <rrs=3D40netflix.com=
@dmarc.ietf.org> wrote:

> Greetings all:

>

> I have implemented hystart++ off of the draft-03 for FreeBSD

> (both newreno and cubic) and I have noted one thing that I think

> is a bug in the spec:

>

> Draft-03 currently says:

>

>

>

>         o  if (currentRou=
ndMinRTT >=3D (lastRoundMinRTT + RttThresh))

>

>            +&nb=
sp; cssBaselineMinRtt =3D currentRoundMinRTT

>

>            +&nb=
sp; exit slow start and enter CSS

>

>

> <And>

>

>

>

>      -  if (currentRoundMinRTT < cssB=
aselineMinRtt)

>

>         o  cssBaselineMin=
Rtt =3D infinity

>

>         o  resume slow st=
art including HyStart++

>

>

>

> But notice that the threshold for entering CSS is (lastRoundMinRtt + R=
ttThresh) and

> the exiting of CSS back to Slow Start is (currentRoundMinRTT < cssB=
aseLineMinRTT), which can

> under the right circumstances set up an oscillation. In the case I obs=
erved I saw lastRoundMinRtt set

> to like 63ms and currentRoundMinRtt set at 115ms. And the next RTT in =
was 114ms.. so out of

> CSS into Slow Start, but the next measurement (114ms again) pushes you=
 back into CSS since

> the lastRoundMinRTT + RttThresh is around 63ms or so.

>

> I would think what you really want here is to set cssBaseLineMinRTT to=
 (lastRoundMinRtt + RttThresh).

>

> I.e. on entry:

>

>

>         o  if (currentRou=
ndMinRTT >=3D (lastRoundMinRTT + RttThresh))

>

>            +&nb=
sp; cssBaselineMinRtt =3D (lastRoundMinRtt + RttThresh)

>

>            +&nb=
sp; exit slow start and enter CSS

>

> R

>

> ------

> Randall Stewart

> rrs@netflix.com

>

>

>

> _______________________________________________

> tcpm mailing list

> tcpm@ietf.org

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------

Randall Stewart

rrs@netflix.com














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Subject: [tcpm] Weekly github digest (RFC8312bis Activity Summary)
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Events=20

Issues
------
* NTAP/rfc8312bis (+1/-0/=F0=9F=92=AC1)
  1 issues created:
  - "Application-Limited" seems ambiguous (by maolson-msft)
    https://github.com/NTAP/rfc8312bis/issues/137=20

  1 issues received 1 new comments:
  - #135 W_max (1 by lisongxu)
    https://github.com/NTAP/rfc8312bis/issues/135=20



Pull requests
-------------
* NTAP/rfc8312bis (+1/-0/=F0=9F=92=AC2)
  1 pull requests submitted:
  - add new subsections for spurious timeout and spurious loss by ack (by g=
oelvidhi)
    https://github.com/NTAP/rfc8312bis/pull/136=20

  1 pull requests received 2 new comments:
  - #136 add new subsections for spurious timeout and spurious loss by ack =
(2 by goelvidhi, lisongxu)
    https://github.com/NTAP/rfc8312bis/pull/136=20


Repositories tracked by this digest:
-----------------------------------
* https://github.com/NTAP/rfc8312bis

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Weekly github digest (RFC8312bis Activity Summary)





Sunday January 16, 2022



Events 



Issues



NTAP/rfc8312bis (+1/-0/=F0=9F=92=AC1)

  
1 issues created:

  

  
1 issues received 1 new comments:

  





Pull requests


NTAP/rfc8312bis (+1/-0/=F0=9F=92=AC2)

  
1 pull requests submitted:

  

  
1 pull requests received 2 new comments:

  



  

    Repositories tracked by this digest:






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From: Zaheduzzaman Sarker 
To: "touch@strayalpha.com" 
CC: Wes Eddy , The IESG , "draft-ietf-tcpm-rfc793bis@ietf.org" , tcpm IETF list , "tcpm-chairs@ietf.org" 
Thread-Topic: [tcpm] Zaheduzzaman Sarker's Discuss on draft-ietf-tcpm-rfc793bis-25: (with DISCUSS and COMMENT)
Thread-Index: AQHXr/LnTcBsG4L8ZUa5idv0wN2zB6xYkt2AgAF8qgCADbBbAA==
Date: Mon, 17 Jan 2022 10:49:25 +0000
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References: <163234356267.14096.14587632428023214216@ietfa.amsl.com> <9e0080c6-8540-c145-2fa6-c8ba82bdabce@mti-systems.com> <8E98D78D-1937-4F17-A1C9-CA36E3004E4D@strayalpha.com>
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Subject: Re: [tcpm] Zaheduzzaman Sarker's Discuss on draft-ietf-tcpm-rfc793bis-25: (with DISCUSS and COMMENT)
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> On 8 Jan 2022, at 18:46, touch@strayalpha.com wrote:
>=20
>=20
>> On Jan 7, 2022, at 11:04 AM, Wesley Eddy > wrote:
>>=20
>>> I have some comments/questions below. By addressing those, I hope =
will improve
>>> the document even better:
>>>=20
>>> * Section 3.1 : says --
>>>      Note that the list of options may be shorter than the data =
offset field
>>>      might imply. The content of the header beyond the End-of-Option =
option
>>>      must be header padding (i.e., zero).
>>>=20
>>>    Should this be a normative MUST?
>> Great question ... The EOL option is a zero byte, and the first such =
option should signal that the option list is over.  So the receiver =
shouldn't need to process or check any further bytes of options to see =
if they're also properly zero'ed padding.
>>=20
>> So, I wouldn't think this needs to be normative, since if it's not =
followed, no harm should result.  However, that leads to the question of =
why it says they must be set to zero then.  Maybe someone else from TCPM =
has a better answer than "that's just what it's always said" ... To me, =
it seems like it's a good thing to do, but maybe not really required.
>>=20
> I don=E2=80=99t know the original reason, but there are at least three =
candidates:
>=20
> A) because zeroes make it easy to check because they won=E2=80=99t =
affect the TCP checksum further
> B) to avoid permitting a covert channel
> C) to avoid needing to add and check for NOPs - which are not zeroes, =
thus need to be checked because they would affect the TCP checksum
>=20
> So yes, I think for at least these reasons it should be a MUST. =
Another way to state this is that an EOL MAY be followed by one or more =
EOLs to enable alignment of the payload, but MUST NOT be followed by any =
other option.

With this input I am a bit convinced that we need to be more verbose =
about the reasons and consider if we should introduce the MUST NOT not =
part. I would expect  rfc793-bis to be more clearly stating the do=E2=80=99=
s and don's to the protocol implementers.

//Zahed=20


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On 8 Jan 2022, at 18:46, touch@strayalpha.com =
wrote:




On Jan =
7, 2022, at 11:04 AM, Wesley Eddy <wes@mti-systems.com>=
 wrote:

I have some comments/questions below. By addressing those, I =
hope will improve
the document even better:

* Section 3.1 : says --
     Note that the list of options may be shorter than the data offset =
field
     might imply. The content of the header beyond the End-of-Option =
option
     must be header padding (i.e., zero).

   Should this be a normative MUST?
Great =
question ... The EOL option is a zero byte, and the first such option =
should signal that the option list is over.  So the receiver =
shouldn't need to process or check any further bytes of options to see =
if they're also properly zero'ed padding.
So, I wouldn't think this needs to be =
normative, since if it's not followed, no harm should result.  =
However, that leads to the question of why it says they must be set to =
zero then.  Maybe someone else from TCPM has a better answer than =
"that's just what it's always said" ... To me, it seems like it's a good =
thing to do, but maybe not really =
required.
I=
 don=E2=80=99t know the original reason, but there are at least three =
candidates:

A) because zeroes =
make it easy to check because they won=E2=80=99t affect the TCP checksum =
further
B) to avoid permitting a covert =
channel
C) to avoid needing to add and check for =
NOPs - which are not zeroes, thus need to be checked because they would =
affect the TCP checksum

So yes, I think for at least these reasons it should be a =
MUST. Another way to state this is that an EOL MAY be followed by one or =
more EOLs to enable alignment of the payload, but MUST NOT be followed =
by any other option.

With this input I am a bit convinced that we need to be =
more verbose about the reasons and consider if we should introduce the =
MUST NOT not part. I would expect  rfc793-bis to be more clearly =
stating the do=E2=80=99s and don's to the protocol =
implementers.

//Zahed 

=

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From nobody Tue Jan 18 12:09:26 2022
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CC: draft-ietf-tcpm-ao-test-vectors@ietf.org, martin.h.duke@gmail.com, michael.scharf@hs-esslingen.de, tcpm-chairs@ietf.org, tcpm@ietf.org
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Date: Tue, 18 Jan 2022 12:09:18 -0800
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Subject: [tcpm] Last Call:  (TCP-AO Test Vectors) to Informational RFC
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The IESG has received a request from the TCP Maintenance and Minor Extensions
WG (tcpm) to consider the following document: - 'TCP-AO Test Vectors'
   as Informational RFC

The IESG plans to make a decision in the next few weeks, and solicits final
comments on this action. Please send substantive comments to the
last-call@ietf.org mailing lists by 2022-02-01. Exceptionally, comments may
be sent to iesg@ietf.org instead. In either case, please retain the beginning
of the Subject line to allow automated sorting.

Abstract


   This document provides test vectors to validate implementations of
   the two mandatory authentication algorithms specified for the TCP
   Authentication Option over both IPv4 and IPv6. This includes
   validation of the key derivation function (KDF) based on a set of
   test connection parameters as well as validation of the message
   authentication code (MAC). Vectors are provided for both currently
   required pairs of KDF and MAC algorithms: one based on SHA-1 and the
   other on AES-128. The vectors also validate both whole TCP segments
   as well as segments whose options are excluded for middlebox
   traversal.




The file can be obtained via
https://datatracker.ietf.org/doc/draft-ietf-tcpm-ao-test-vectors/



No IPR declarations have been submitted directly on this I-D.






From nobody Tue Jan 18 13:16:35 2022
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From: Russ Housley 
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Date: Tue, 18 Jan 2022 16:16:22 -0500
Cc: tcpm@ietf.org, tcpm-chairs@ietf.org, draft-ietf-tcpm-ao-test-vectors@ietf.org
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To: Last Call 
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Subject: Re: [tcpm] Last Call:  (TCP-AO Test Vectors) to Informational RFC
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The introduction of the document begins:

   This document provides test vectors to validate the correct
   implementation of the TCP Authentication Option (TCP-AO) [RFC5925]
   and its mandatory cryptographic algorithms defined in [RFC5926].

I expected to see discussion of the algorithms that are in the table of =
contents in RFC 5926.  However, these algorithm names are not used.  =
Using different algorithm name add confusion.

For the Key Derivation Functions (KDFs), please use the names in RFC =
5926: KDF_HMAC_SHA1and KDF_AES_128_CMAC.

For the MAC Algorithms, please use the names in RFC 5926: HMAC-SHA-1-96 =
and AES-128-CMAC-96.

Thank for you consideration,
  Russ


> On Jan 18, 2022, at 3:09 PM, The IESG  wrote:
>=20
>=20
> The IESG has received a request from the TCP Maintenance and Minor =
Extensions
> WG (tcpm) to consider the following document: - 'TCP-AO Test Vectors'
>   as Informational RFC
>=20
> The IESG plans to make a decision in the next few weeks, and solicits =
final
> comments on this action. Please send substantive comments to the
> last-call@ietf.org mailing lists by 2022-02-01. Exceptionally, =
comments may
> be sent to iesg@ietf.org instead. In either case, please retain the =
beginning
> of the Subject line to allow automated sorting.
>=20
> Abstract
>=20
>=20
>   This document provides test vectors to validate implementations of
>   the two mandatory authentication algorithms specified for the TCP
>   Authentication Option over both IPv4 and IPv6. This includes
>   validation of the key derivation function (KDF) based on a set of
>   test connection parameters as well as validation of the message
>   authentication code (MAC). Vectors are provided for both currently
>   required pairs of KDF and MAC algorithms: one based on SHA-1 and the
>   other on AES-128. The vectors also validate both whole TCP segments
>   as well as segments whose options are excluded for middlebox
>   traversal.


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From: "Scharf, Michael" 
To: "mohamed.boucadair@orange.com" 
CC: "tcpm@ietf.org" 
Thread-Topic: [tcpm] I-D Action: draft-ietf-tcpm-yang-tcp-04.txt
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Subject: Re: [tcpm] I-D Action: draft-ietf-tcpm-yang-tcp-04.txt
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Hi Med,

Thanks a lot for this further review with good catches.

We have addressed all comments in the current working copy for -06, except =
for the disclaimer text regarding line wrap in B.1. This disclaimer is curr=
ently automatically introduced by the build tools no matter whether it is n=
eeded. That detail can be sorted out later by the RFC editor.

Details can be found at the repository with the working copy: https://githu=
b.com/mjethanandani/ietf-tcp

Our suggestion is to change the TCP-AO example so that it illustrates the u=
se of send-id and recv-id with parameters documented in draft-ietf-tcpm-ao-=
test-vectors.

As the WGLC is ongoing, we would wait for further comments before finalizin=
g -06.

Thanks

Michael (as author)


> -----Original Message-----
> From: mohamed.boucadair@orange.com
> 
> Sent: Monday, January 3, 2022 10:13 AM
> To: Scharf, Michael 
> Cc: tcpm@ietf.org
> Subject: RE: [tcpm] I-D Action: draft-ietf-tcpm-yang-tcp-04.txt
>=20
> Hi Michael,
>=20
> The changes look good. Thank you.
>=20
> Please find below some comments on the new version:
> - Section 4
>=20
> (1)
> OLD:
>        reference
>          "RFC XXXX, YANG Model for Transmission Control Protocol (TCP)
>                     Configuration.";
>=20
> NEW:
>        reference
>          "RFC XXXX: A YANG Model for Transmission Control Protocol (TCP)
>                     Configuration";
>=20
> (2)
>=20
> Add "when set to true" in the description of almost all the Boolean nodes=
.
>=20
> (3)
>=20
> I still don't think "forms the connection identifier" is accurate. The co=
nnection
> is identified by the 4-uple (which is captured in the key statement). You=
 may
> consider simply: s/forms the connection identifier/of the connection.
> Another better approach would be, e.g.:
>=20
> OLD:
>  "Local address that forms the connection identifier.";
> NEW:
>  "Identifies the address that is used locally by an endpoint to bind the
> connection.";
>=20
> OLD:
>  "Remote address that forms the connection identifier.";
> NEW:
>  "Identifies the address that is used by the peer endpoint to bind the
> connection.";
>=20
> etc.
>=20
> - Make this change in 5.2: s/registrations are requested/registration is
> requested
> - Update 5.2 to make it explicit that the module is not maintained by IAN=
A:
>=20
> OLD:
>       name:         ietf-tcp
>       namespace:    urn:ietf:params:xml:ns:yang:ietf-tcp
>       prefix:       tcp
>       reference:    RFC XXXX
>=20
> NEW:
>       name:         ietf-tcp
>       namespace:    urn:ietf:params:xml:ns:yang:ietf-tcp
>       prefix:       tcp
>       maintained by IANA: N
>       reference:    RFC XXXX
>=20
> - I think you can remove the note in B.1
> - remove "\" right after "" in B.2
> - As you are referring to RFC 8792, you need to add the 8792 header to
> adhere with the following (B.2):
>=20
> =3D=3D=3D=3D=3D=3D
> ...
>    Text content that has been folded as specified by this strategy MUST
>    adhere to the following structure.
>=20
> 7.1.1.  Header
>=20
>    The header is two lines long.
>=20
>    The first line is the following 36-character string; this string MAY
>    be surrounded by any number of printable characters.  This first line
>    cannot itself be folded.
>=20
>    NOTE: '\' line wrapping per RFC 8792
>=20
>    The second line is an empty line, containing only the end-of-line
>    character sequence.  This line provides visual separation for
>    readability.
> =3D=3D=3D=3D=3D
>=20
> - B.2:
>=20
> 
>=20
> Not sure why this I-D is cited here given the example does not echo an
> example from that I-D (e.g., same local/remote port, local address, etc.)=
.
> Also, I was expecting to see an example that illustrates the use of send-=
id
> and recv-id.
>=20
> If the citation is maintained, please make this change:
>=20
> s/demonstrated by examples in draft-touch-tcpm-ao-test-
> vectors/demonstrated by examples in I-D.ietf-tcpm-ao-test-vectors
>=20
> Cheers,
> Med
>=20
> > -----Message d'origine-----
> > De=A0: Scharf, Michael 
> > Envoy=E9=A0: jeudi 30 d=E9cembre 2021 15:19
> > =C0=A0: BOUCADAIR Mohamed INNOV/NET
> 
> > Cc=A0: tcpm@ietf.org
> > Objet=A0: RE: [tcpm] I-D Action: draft-ietf-tcpm-yang-tcp-04.txt
> >
> > Hi Med,
> >
> > Thanks a lot for the detailed review. I went through all your comments.
> > Most were straightforward to address.
> >
> > Our suggestion is to clearly state that MPTCP is outside the scope of t=
his
> > model. MPTCP may need a different YANG model. Yet, the most obvious
> use
> > case of the YANG model are TCP-based control plane protocols on routers
> > (BGP, LDP, ...). At least I am not aware of widespread use of BGP over
> > MPTCP.
> >
> > Can you please have a look at -05 and let me know if -05 works for you?
> >
> > The full diff is available at: https://www.ietf.org/rfcdiff?url2=3Ddraf=
t-
> > ietf-tcpm-yang-tcp-05
> >
> > Thanks
> >
> > Michael
> >
> > > -----Original Message-----
> > > From: mohamed.boucadair@orange.com
> > > 
> > > Sent: Friday, November 12, 2021 11:17 AM
> > > To: Scharf, Michael 
> > > Cc: tcpm@ietf.org
> > > Subject: RE: [tcpm] I-D Action: draft-ietf-tcpm-yang-tcp-04.txt
> > >
> > > Hi Michael,
> > >
> > > FWIW, please find below some comments to the latest version of the
> > draft:
> > >
> > > * pdf: https://raw.githubusercontent.com/boucadair/IETF-Drafts-
> > > Reviews/master/draft-ietf-tcpm-yang-tcp-04-rev%20Med.pdf
> > > * doc: https://github.com/boucadair/IETF-Drafts-
> > > Reviews/raw/master/draft-ietf-tcpm-yang-tcp-04-rev%20Med.doc
> > >
> > > I think that the document is almost stable. Thank you.
> > >
> > > Cheers,
> > > Med
> > >
> > > > -----Message d'origine-----
> > > > De=A0: tcpm  De la part de
> > > > internet-drafts@ietf.org Envoy=E9=A0: lundi 25 octobre 2021 20:22 =
=C0=A0:
> > > > i-d-announce@ietf.org Cc=A0: tcpm@ietf.org Objet=A0: [tcpm] I-D Act=
ion:
> > > > draft-ietf-tcpm-yang-tcp-04.txt
> > > >
> > > >
> > > > A New Internet-Draft is available from the on-line Internet-Drafts
> > > > directories.
> > > > This draft is a work item of the TCP Maintenance and Minor
> > > > Extensions WG of the IETF.
> > > >
> > > >         Title           : YANG Model for Transmission Control Proto=
col
> > > > (TCP) Configuration
> > > >         Authors         : Michael Scharf
> > > >                           Mahesh Jethanandani
> > > >                           Vishal Murgai
> > > > 	Filename        : draft-ietf-tcpm-yang-tcp-04.txt
> > > > 	Pages           : 23
> > > > 	Date            : 2021-10-25
> > > >
> > > > Abstract:
> > > >    This document specifies a minimal YANG model for TCP on devices
> > that
> > > >    are configured by network management protocols.  The YANG model
> > > >    defines a container for all TCP connections and groupings of
> > > >    authentication parameters that can be imported and used in TCP
> > > >    implementations or by other models that need to configure TCP
> > > >    parameters.  The model also includes basic TCP statistics.  The
> > model
> > > >    is NMDA (RFC 8342) compliant.
> > > >
> > > >
> > > > The IETF datatracker status page for this draft is:
> > > > https://datatracker.ietf.org/doc/draft-ietf-tcpm-yang-tcp/
> > > >
> > > > There is also an htmlized version available at:
> > > > https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-yang-tcp-04
> > > >
> > > > A diff from the previous version is available at:
> > > > https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-tcpm-yang-tcp-04
> > > >
> > > >
> > > > Internet-Drafts are also available by anonymous FTP at:
> > > > ftp://ftp.ietf.org/internet-drafts/
> > > >
> > > >
> > > > _______________________________________________
> > > > tcpm mailing list
> > > > tcpm@ietf.org
> > > > https://www.ietf.org/mailman/listinfo/tcpm
> > >
> > >
> __________________________________________________________
> > >
> __________________________________________________________
> > > _____
> > >
> > > Ce message et ses pieces jointes peuvent contenir des informations
> > > confidentielles ou privilegiees et ne doivent donc pas etre diffuses,
> > > exploites ou copies sans autorisation. Si vous avez recu ce message
> > > par erreur, veuillez le signaler a l'expediteur et le detruire ainsi
> > > que les pieces jointes. Les messages electroniques etant susceptibles
> > > d'alteration, Orange decline toute responsabilite si ce message a ete
> > > altere, deforme ou falsifie. Merci.
> > >
> > > This message and its attachments may contain confidential or
> > > privileged information that may be protected by law; they should not
> > > be distributed, used or copied without authorisation.
> > > If you have received this email in error, please notify the sender an=
d
> > > delete this message and its attachments.
> > > As emails may be altered, Orange is not liable for messages that have
> > > been modified, changed or falsified.
> > > Thank you.
>=20
>=20
> __________________________________________________________
> __________________________________________________________
> _____
>=20
> Ce message et ses pieces jointes peuvent contenir des informations
> confidentielles ou privilegiees et ne doivent donc
> pas etre diffuses, exploites ou copies sans autorisation. Si vous avez re=
cu ce
> message par erreur, veuillez le signaler
> a l'expediteur et le detruire ainsi que les pieces jointes. Les messages
> electroniques etant susceptibles d'alteration,
> Orange decline toute responsabilite si ce message a ete altere, deforme o=
u
> falsifie. Merci.
>=20
> This message and its attachments may contain confidential or privileged
> information that may be protected by law;
> they should not be distributed, used or copied without authorisation.
> If you have received this email in error, please notify the sender and de=
lete
> this message and its attachments.
> As emails may be altered, Orange is not liable for messages that have bee=
n
> modified, changed or falsified.
> Thank you.


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From: "touch@strayalpha.com" 
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Date: Wed, 19 Jan 2022 08:30:26 -0800
Cc: Last Call , tcpm IETF list , draft-ietf-tcpm-ao-test-vectors@ietf.org, tcpm-chairs@ietf.org
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To: Russ Housley 
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Hi, Russ,

Point taken; we were a bit to colloquial in referring to SHA1 and AES =
rather than the specific versions form the origin RFCs. That will be =
updated after I see what other LC comments roll in.

Joe

=E2=80=94
Joe Touch, temporal epistemologist
www.strayalpha.com

> On Jan 18, 2022, at 1:16 PM, Russ Housley  =
wrote:
>=20
>=20
> The introduction of the document begins:
>=20
>   This document provides test vectors to validate the correct
>   implementation of the TCP Authentication Option (TCP-AO) [RFC5925]
>   and its mandatory cryptographic algorithms defined in [RFC5926].
>=20
> I expected to see discussion of the algorithms that are in the table =
of contents in RFC 5926.  However, these algorithm names are not used.  =
Using different algorithm name add confusion.
>=20
> For the Key Derivation Functions (KDFs), please use the names in RFC =
5926: KDF_HMAC_SHA1and KDF_AES_128_CMAC.
>=20
> For the MAC Algorithms, please use the names in RFC 5926: =
HMAC-SHA-1-96 and AES-128-CMAC-96.
>=20
> Thank for you consideration,
>  Russ
>=20
>=20
>> On Jan 18, 2022, at 3:09 PM, The IESG  =
wrote:
>>=20
>>=20
>> The IESG has received a request from the TCP Maintenance and Minor =
Extensions
>> WG (tcpm) to consider the following document: - 'TCP-AO Test Vectors'
>>  as Informational RFC
>>=20
>> The IESG plans to make a decision in the next few weeks, and solicits =
final
>> comments on this action. Please send substantive comments to the
>> last-call@ietf.org mailing lists by 2022-02-01. Exceptionally, =
comments may
>> be sent to iesg@ietf.org instead. In either case, please retain the =
beginning
>> of the Subject line to allow automated sorting.
>>=20
>> Abstract
>>=20
>>=20
>>  This document provides test vectors to validate implementations of
>>  the two mandatory authentication algorithms specified for the TCP
>>  Authentication Option over both IPv4 and IPv6. This includes
>>  validation of the key derivation function (KDF) based on a set of
>>  test connection parameters as well as validation of the message
>>  authentication code (MAC). Vectors are provided for both currently
>>  required pairs of KDF and MAC algorithms: one based on SHA-1 and the
>>  other on AES-128. The vectors also validate both whole TCP segments
>>  as well as segments whose options are excluded for middlebox
>>  traversal.
>=20
> --=20
> last-call mailing list
> last-call@ietf.org
> https://www.ietf.org/mailman/listinfo/last-call


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Hi, =
Russ,

Point taken; =
we were a bit to colloquial in referring to SHA1 and AES rather than the =
specific versions form the origin RFCs. That will be updated after I see =
what other LC comments roll in.

Joe



=E2=80=94
Joe Touch, =
temporal epistemologist
www.strayalpha.com





On Jan 18, 2022, at 1:16 PM, Russ Housley <housley@vigilsec.com> wrote:


The introduction of the document begins:

   This document provides test vectors to validate =
the correct
   implementation of the TCP =
Authentication Option (TCP-AO) [RFC5925]
   and =
its mandatory cryptographic algorithms defined in [RFC5926].

I expected to see discussion of the algorithms =
that are in the table of contents in RFC 5926.  However, these =
algorithm names are not used.  Using different algorithm name add =
confusion.

For the Key Derivation Functions =
(KDFs), please use the names in RFC 5926: KDF_HMAC_SHA1and =
KDF_AES_128_CMAC.

For the MAC Algorithms, =
please use the names in RFC 5926: HMAC-SHA-1-96 and AES-128-CMAC-96.

Thank for you consideration,
 =
 Russ


On Jan 18, 2022, at 3:09 PM, The IESG <iesg-secretary@ietf.org> wrote:


The IESG has received a request from the TCP =
Maintenance and Minor Extensions
WG (tcpm) to consider the =
following document: - 'TCP-AO Test Vectors'
 =
<draft-ietf-tcpm-ao-test-vectors-04.txt> as Informational RFC

The IESG plans to make a decision in the next =
few weeks, and solicits final
comments on this action. =
Please send substantive comments to the
last-call@ietf.org =
mailing lists by 2022-02-01. Exceptionally, comments may
be =
sent to iesg@ietf.org =
instead. In either case, please retain the beginning
of =
the Subject line to allow automated sorting.

Abstract


 =
 This document provides test vectors to validate implementations =
of
  the two mandatory authentication algorithms =
specified for the TCP
  Authentication Option over =
both IPv4 and IPv6. This includes
  validation of the =
key derivation function (KDF) based on a set of
 =
 test connection parameters as well as validation of the message
  authentication code (MAC). Vectors are provided for =
both currently
  required pairs of KDF and MAC =
algorithms: one based on SHA-1 and the
  other on =
AES-128. The vectors also validate both whole TCP segments
 =
 as well as segments whose options are excluded for middlebox
  traversal.

-- =

last-call mailing list
last-call@ietf.org
https://www.ietf.org/mailman/listinfo/last-call

=

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Date: Fri, 21 Jan 2022 22:05:43 -0800
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PS - update just posted.

Further comments should reference v. 05 if possible.

Joe
=E2=80=94
Joe Touch, temporal epistemologist
www.strayalpha.com

> On Jan 19, 2022, at 8:30 AM, touch@strayalpha.com wrote:
>=20
> Hi, Russ,
>=20
> Point taken; we were a bit to colloquial in referring to SHA1 and AES =
rather than the specific versions form the origin RFCs. That will be =
updated after I see what other LC comments roll in.
>=20
> Joe
>=20
> =E2=80=94
> Joe Touch, temporal epistemologist
> www.strayalpha.com 
>=20
>> On Jan 18, 2022, at 1:16 PM, Russ Housley > wrote:
>>=20
>>=20
>> The introduction of the document begins:
>>=20
>>   This document provides test vectors to validate the correct
>>   implementation of the TCP Authentication Option (TCP-AO) [RFC5925]
>>   and its mandatory cryptographic algorithms defined in [RFC5926].
>>=20
>> I expected to see discussion of the algorithms that are in the table =
of contents in RFC 5926.  However, these algorithm names are not used.  =
Using different algorithm name add confusion.
>>=20
>> For the Key Derivation Functions (KDFs), please use the names in RFC =
5926: KDF_HMAC_SHA1and KDF_AES_128_CMAC.
>>=20
>> For the MAC Algorithms, please use the names in RFC 5926: =
HMAC-SHA-1-96 and AES-128-CMAC-96.
>>=20
>> Thank for you consideration,
>>  Russ
>>=20
>>=20
>>> On Jan 18, 2022, at 3:09 PM, The IESG > wrote:
>>>=20
>>>=20
>>> The IESG has received a request from the TCP Maintenance and Minor =
Extensions
>>> WG (tcpm) to consider the following document: - 'TCP-AO Test =
Vectors'
>>>  as Informational RFC
>>>=20
>>> The IESG plans to make a decision in the next few weeks, and =
solicits final
>>> comments on this action. Please send substantive comments to the
>>> last-call@ietf.org  mailing lists by =
2022-02-01. Exceptionally, comments may
>>> be sent to iesg@ietf.org  instead. In either =
case, please retain the beginning
>>> of the Subject line to allow automated sorting.
>>>=20
>>> Abstract
>>>=20
>>>=20
>>>  This document provides test vectors to validate implementations of
>>>  the two mandatory authentication algorithms specified for the TCP
>>>  Authentication Option over both IPv4 and IPv6. This includes
>>>  validation of the key derivation function (KDF) based on a set of
>>>  test connection parameters as well as validation of the message
>>>  authentication code (MAC). Vectors are provided for both currently
>>>  required pairs of KDF and MAC algorithms: one based on SHA-1 and =
the
>>>  other on AES-128. The vectors also validate both whole TCP segments
>>>  as well as segments whose options are excluded for middlebox
>>>  traversal.
>>=20
>> --=20
>> last-call mailing list
>> last-call@ietf.org 
>> https://www.ietf.org/mailman/listinfo/last-call
>=20


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Content-Transfer-Encoding: quoted-printable
Content-Type: text/html;
	charset=utf-8

PS =
- update just posted.

Further comments should reference v. 05 if =
possible.

Joe


=E2=80=94
Joe Touch, =
temporal epistemologist
www.strayalpha.com





On Jan 19, 2022, at 8:30 AM, touch@strayalpha.com =
wrote:

Hi, Russ,

Point taken; we were a =
bit to colloquial in referring to SHA1 and AES rather than the specific =
versions form the origin RFCs. That will be updated after I see what =
other LC comments roll in.

Joe



=E2=80=94
Joe Touch, temporal =
epistemologist
www.strayalpha.com





On Jan 18, 2022, at 1:16 PM, Russ Housley <housley@vigilsec.com> wrote:


The introduction of the document begins:

   This document provides test vectors to validate =
the correct
   implementation of the TCP =
Authentication Option (TCP-AO) [RFC5925]
   and =
its mandatory cryptographic algorithms defined in [RFC5926].

I expected to see discussion of the algorithms =
that are in the table of contents in RFC 5926.  However, these =
algorithm names are not used.  Using different algorithm name add =
confusion.

For the Key Derivation Functions =
(KDFs), please use the names in RFC 5926: KDF_HMAC_SHA1and =
KDF_AES_128_CMAC.

For the MAC Algorithms, =
please use the names in RFC 5926: HMAC-SHA-1-96 and AES-128-CMAC-96.

Thank for you consideration,
 =
 Russ


On Jan 18, 2022, at 3:09 PM, The IESG <iesg-secretary@ietf.org> wrote:


The IESG has received a request from the TCP =
Maintenance and Minor Extensions
WG (tcpm) to consider the =
following document: - 'TCP-AO Test Vectors'
 =
<draft-ietf-tcpm-ao-test-vectors-04.txt> as Informational RFC

The IESG plans to make a decision in the next =
few weeks, and solicits final
comments on this action. =
Please send substantive comments to the
last-call@ietf.org =
mailing lists by 2022-02-01. Exceptionally, comments may
be =
sent to iesg@ietf.org =
instead. In either case, please retain the beginning
of =
the Subject line to allow automated sorting.

Abstract


 =
 This document provides test vectors to validate implementations =
of
  the two mandatory authentication algorithms =
specified for the TCP
  Authentication Option over =
both IPv4 and IPv6. This includes
  validation of the =
key derivation function (KDF) based on a set of
 =
 test connection parameters as well as validation of the message
  authentication code (MAC). Vectors are provided for =
both currently
  required pairs of KDF and MAC =
algorithms: one based on SHA-1 and the
  other on =
AES-128. The vectors also validate both whole TCP segments
 =
 as well as segments whose options are excluded for middlebox
  traversal.

-- =

last-call mailing list
last-call@ietf.org
https://www.ietf.org/mailman/listinfo/last-call


=

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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the TCP Maintenance and Minor Extensions WG of the IETF.

        Title           : TCP-AO Test Vectors
        Authors         : Joe Touch
                          Juhamatti Kuusisaari
	Filename        : draft-ietf-tcpm-ao-test-vectors-05.txt
	Pages           : 27
	Date            : 2022-01-21

Abstract:
   This document provides test vectors to validate implementations of
   the two mandatory authentication algorithms specified for the TCP
   Authentication Option over both IPv4 and IPv6. This includes
   validation of the key derivation function (KDF) based on a set of
   test connection parameters as well as validation of the message
   authentication code (MAC). Vectors are provided for both currently
   required pairs of KDF and MAC algorithms: KDF_HMAC_SHA1 and HMAC-
   SHA-1-96, and KDF_AES_128_CMAC and AES-128-CMAC-96. The vectors also
   validate both whole TCP segments as well as segments whose options
   are excluded for middlebox traversal.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-tcpm-ao-test-vectors/

There is also an htmlized version available at:
https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-ao-test-vectors-05

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-ao-test-vectors-05


Internet-Drafts are also available by rsync at rsync.ietf.org::internet-drafts



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Events=20

Issues
------
* NTAP/rfc8312bis (+0/-1/=F0=9F=92=AC7)
  2 issues received 7 new comments:
  - #137 "Application-Limited" seems ambiguous (6 by goelvidhi, maolson-msf=
t, nealcardwell)
    https://github.com/NTAP/rfc8312bis/issues/137=20
  - #135 W_max (1 by larseggert)
    https://github.com/NTAP/rfc8312bis/issues/135=20

  1 issues closed:
  - W_max https://github.com/NTAP/rfc8312bis/issues/135=20



Pull requests
-------------
* NTAP/rfc8312bis (+2/-1/=F0=9F=92=AC3)
  2 pull requests submitted:
  - clarify the meaning of "application-limited" (by nealcardwell)
    https://github.com/NTAP/rfc8312bis/pull/139=20
  - rephrase "changes the window increase function of Reno" (by nealcardwel=
l)
    https://github.com/NTAP/rfc8312bis/pull/138=20

  2 pull requests received 3 new comments:
  - #139 clarify the meaning of "application-limited" (1 by nealcardwell)
    https://github.com/NTAP/rfc8312bis/pull/139=20
  - #136 add new subsections for spurious timeout and spurious loss by ack =
(2 by goelvidhi)
    https://github.com/NTAP/rfc8312bis/pull/136=20

  1 pull requests merged:
  - rephrase "changes the window increase function of Reno"
    https://github.com/NTAP/rfc8312bis/pull/138=20


Repositories tracked by this digest:
-----------------------------------
* https://github.com/NTAP/rfc8312bis

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Weekly github digest (RFC8312bis Activity Summary)





Sunday January 23, 2022



Events 



Issues



NTAP/rfc8312bis (+0/-1/=F0=9F=92=AC7)


  
2 issues received 7 new comments:

  

  
1 issues closed:

  




Pull requests


NTAP/rfc8312bis (+2/-1/=F0=9F=92=AC3)

  
2 pull requests submitted:

  

  
2 pull requests received 3 new comments:

  

  
1 pull requests merged:

  


  

    Repositories tracked by this digest:






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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the TCP Maintenance and Minor Extensions WG of the IETF.

        Title           : HyStart++: Modified Slow Start for TCP
        Authors         : Praveen Balasubramanian
                          Yi Huang
                          Matt Olson
	Filename        : draft-ietf-tcpm-hystartplusplus-04.txt
	Pages           : 8
	Date            : 2022-01-23

Abstract:
   This doument describes HyStart++, a simple modification to the slow
   start phase of TCP congestion control algorithms.  Traditional slow
   start can overshoot the ideal send rate in many cases, causing high
   packet loss and poor performance.  HyStart++ uses a delay increase
   heuristic to find an exit point before possible overshoot.  It also
   adds a mitigation to prevent jitter from causing premature slow start
   exit.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-tcpm-hystartplusplus/

There is also an htmlized version available at:
https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-hystartplusplus-04

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-hystartplusplus-04


Internet-Drafts are also available by rsync at rsync.ietf.org::internet-drafts



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Reviewer: Christian Huitema
Review result: Ready

I have reviewed this document as part of the security directorate's ongoing
effort to review all IETF documents being processed by the IESG.  These
comments were written primarily for the benefit of the security area directors.
Document editors and WG chairs should treat these comments just like any other
last call comments.

This document does exactly what the abstract says: provide test vectors that
cover the key derivation and message signing algorithms defined for TCP-AO.
Defining these test vectors will help improve the quality of implementations.
It certainly does not create any new security issue.



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	charset=utf-8

I hope these changes are not too late.  Some things I=E2=80=99ve been =
looking into recently could be applicable to this draft.

Included below is a context diff of -25 and three changes:
adjustment of an expression in =C2=A73.7.1 to make it compatible with a =
similar expression in the same sentence
addition of a citation and supporting text in =C2=A73.8.1
a spelling correction in =C2=A73.8.6.3

Some notes about the changes:
The citation was for IEN177.  I couldn=E2=80=99t find a template for an =
IEN, so I had to roll my own.
Long story short =E2=80=94  looking at some mailing list discussions =
about Internet congestion during the 1980s eventually brought me to Dave =
Mills=E2=80=99 Internet Delay Experiments study, RFC889.  In the study, =
he expressed concern about the alpha and beta parameters of the (RFC793) =
TCP algorithm, made some changes, and took some measurements.  I =
wondered where the original parameters came from, especially since they =
were not cited in RFC793.  Further investigation led me to IEN177.
The subject matter of RFC889 may warrant it being obsoleted and its =
status changed to Historic.  There has recently been some concern about =
changing the status of pre-IETF documents =
 until the new RFC Editor model  is in place.  If there is any =
pushback about changing RFC889=E2=80=99s status, I hope these changes =
can still be incorporated.
Incidentally, RFC879 was obsoleted by RFC7805.

Regards, Greg

----

*** draft-ietf-tcpm-rfc793bis-25.xml	2022-01-24 15:17:04.000000000 =
-0800
--- draft-ietf-tcpm-rfc793bis-25.xml+	2022-01-24 18:05:42.000000000 =
-0800
***************
*** 1842,1848 ****
      
      
      If an MSS option is not received at connection setup, TCP =
implementations
!     MUST assume a default send MSS of 536 (576-40) for IPv4 or 1220 =
(1280 - 60) for IPv6 (MUST-15).
      
      
      The maximum size of a segment that TCP endpoint really sends, the
--- 1842,1848 ----
      
      
      If an MSS option is not received at connection setup, TCP =
implementations
!     MUST assume a default send MSS of 536 (576 - 40) for IPv4 or 1220 =
(1280 - 60) for IPv6 (MUST-15).
      
      
      The maximum size of a segment that TCP endpoint really sends, the
***************
*** 1996,2002 ****
        algorithm in , including Karn's =
algorithm for taking RTT samples (MUST-18).
  
  
!       RFC 793 contains an early example procedure for computing the =
RTO.  This was then replaced by the algorithm described in RFC 1122, and =
subsequently updated in RFC 2988, and then again in RFC 6298.
  
  
  RFC 1122 allows that if a retransmitted packet is identical to the =
original
--- 1996,2002 ----
        algorithm in , including Karn's =
algorithm for taking RTT samples (MUST-18).
  
  
!       RFC 793 contains an early example procedure for computing the =
RTO, based on TCP performance measurements done by the Royal Signals and =
Radar Establishment (RSRE) .  This was then =
replaced by the algorithm described in RFC 1122, and subsequently =
updated in RFC 2988, and then again in RFC 6298.
  
  
  RFC 1122 allows that if a retransmitted packet is identical to the =
original
***************
*** 2433,2439 ****
  	    (SHLD-19). Excessive delays on ACKs can disturb the =
round-trip
  	    timing and packet "clocking" algorithms.  More =
complete
  	    discussion of delayed ACK behavior is in Section 4.2 of RFC =
5681
! 	    , including recomendations to =
immediately
  	    acknowledge out-of-order segments, segments above a gap in =
sequence
  	    space, or segments that fill all or part of a gap, in order =
to
  	    accelerate loss recovery.
--- 2433,2439 ----
  	    (SHLD-19). Excessive delays on ACKs can disturb the =
round-trip
  	    timing and packet "clocking" algorithms.  More =
complete
  	    discussion of delayed ACK behavior is in Section 4.2 of RFC =
5681
! 	    , including recommendations to =
immediately
  	    acknowledge out-of-order segments, segments above a gap in =
sequence
  	    space, or segments that fill all or part of a gap, in order =
to
  	    accelerate loss recovery.
***************
*** 5066,5071 ****
--- 5066,5081 ----
              
              
          
+=20
+ 	
+ 	    
+ 		Comments on Action Items from the January =
Meeting
+ 		
+ 		
+ 	    
+ 	    
+ 	
 =20
      
      



--Apple-Mail=_DE0B1FA7-60FE-405B-A1F4-6C35AE3B776E
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html;
	charset=utf-8

I hope these changes =
are not too late.  Some things I=E2=80=99ve been looking into =
recently could be applicable to this draft.

Included below is a context diff of -25 =
and three changes:
  • adjustment of an expression in =C2=A73.7.1 to make it =
compatible with a similar expression in the same sentence
  • addition of a citation and supporting text =
in =C2=A73.8.1
  • a spelling correction =
in =C2=A73.8.6.3

Some notes about the =
changes:
  • The=
 citation was for IEN177.  I couldn=E2=80=99t find a template for =
an IEN, so I had to roll my own.
  • Long story short =E2=80=
=94  looking at some mailing list discussions about Internet =
congestion during the 1980s eventually brought me to Dave Mills=E2=80=99 =
Internet Delay Experiments study, RFC889.  In the study, he =
expressed concern about the alpha and beta parameters of the (RFC793) =
TCP algorithm, made some changes, and took some measurements.  I =
wondered where the original parameters came from, especially since they =
were not cited in RFC793.  Further investigation led me to =
IEN177.
  • The subject matter of RFC889 may warrant it =
being obsoleted and its status changed to Historic.  There has =
recently been some concern about changing the status of =
pre-IETF documents until the new RFC Editor model  is in =
place.  If there is any pushback about changing RFC889=E2=80=99s =
status, I hope these changes can still be incorporated.
  • Incidentally, RFC879 was obsoleted by RFC7805.

Regards, Greg

----

*** =
draft-ietf-tcpm-rfc793bis-25.xml	2022-01-24 15:17:04.000000000 =
-0800
--- draft-ietf-tcpm-rfc793bis-25.xml+	=
2022-01-24 18:05:42.000000000 -0800
***************
*** 1842,1848 ****
      </t>
    =
  <t>
      If an MSS option is =
not received at connection setup, TCP implementations
! =
    MUST assume a default send MSS of 536 (576-40) for IPv4 or =
1220 (1280 - 60) for IPv6 (MUST-15).
      =
</t>
      <t>
      The maximum size of a segment that TCP =
endpoint really sends, the
--- 1842,1848 ----
      </t>
    =
  <t>
      If an MSS option is =
not received at connection setup, TCP implementations
! =
    MUST assume a default send MSS of 536 (576 - 40) for IPv4 =
or 1220 (1280 - 60) for IPv6 (MUST-15).
    =
  </t>
      <t>
      The maximum size of a segment that TCP =
endpoint really sends, the
***************
***=
 1996,2002 ****
        algorithm in =
<xref target=3D"RFC6298"/>, including Karn's algorithm for taking =
RTT samples (MUST-18).
  </t>
  <t>
!       RFC 793 =
contains an early example procedure for computing the RTO.  This =
was then replaced by the algorithm described in RFC 1122, and =
subsequently updated in RFC 2988, and then again in RFC 6298.
  </t>
  <t>
  RFC 1122 allows that if a retransmitted packet is =
identical to the original
--- 1996,2002 ----
        algorithm in <xref =
target=3D"RFC6298"/>, including Karn's algorithm for taking RTT =
samples (MUST-18).
  </t>
  =
<t>
!       RFC 793 contains an early =
example procedure for computing the RTO, based on TCP performance =
measurements done by the Royal Signals and Radar Establishment =
(RSRE) <xref target=3D"IEN177"/>.  This was then replaced by =
the algorithm described in RFC 1122, and subsequently updated in =
RFC 2988, and then again in RFC 6298.
  </t>
  <t>
  RFC 1122 allows that if =
a retransmitted packet is identical to the original
***************
*** 2433,2439 ****
  	    (SHLD-19). =
Excessive delays on ACKs can disturb the round-trip
  	    timing and packet =
&quot;clocking&quot; algorithms.  More complete
  	    discussion of =
delayed ACK behavior is in Section 4.2 of RFC 5681
! 	    <xref =
target=3D"RFC5681"/>, including recomendations to immediately
  	    acknowledge =
out-of-order segments, segments above a gap in sequence
  	    space, or segments =
that fill all or part of a gap, in order to
  	    accelerate loss =
recovery.
--- 2433,2439 ----
  	  =
  (SHLD-19). Excessive delays on ACKs can disturb the round-trip
  	    timing and packet =
&quot;clocking&quot; algorithms.  More complete
  	    discussion of =
delayed ACK behavior is in Section 4.2 of RFC 5681
! 	    <xref =
target=3D"RFC5681"/>, including recommendations to immediately
  	    acknowledge =
out-of-order segments, segments above a gap in sequence
  	    space, or segments =
that fill all or part of a gap, in order to
  	    accelerate loss =
recovery.
***************
*** 5066,5071 =
****
--- 5066,5081 ----
      =
        </front>
    =
          <seriesInfo name=3D"Proceedings of =
IEEE INFOCOM" value=3D"pp. 1573-1583"/>
    =
      </reference>
+ 
+ 	<reference
+ 	    anchor=3D"IEN177" =
target=3D"https://www.rfc-editor.org/ien/ien177.txt">
+ 	    <front>
+ 		<title>Comments on =
Action Items from the January Meeting</title>
+ 		<author initials =3D =
"J" surname=3D"Postel"></author>
+ 		=
<date year=3D"1981" month=3D"March" />
+ 	    </front>
+ 	    <seriesInfo =
name=3D"IEN" value=3D"177"/>
+ 	=
</reference>
  
  =
    </references>
      =
<section title=3D"Other Implementation Notes">

=

--Apple-Mail=_DE0B1FA7-60FE-405B-A1F4-6C35AE3B776E--


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From: Yoshifumi Nishida 
Date: Tue, 25 Jan 2022 15:07:48 -0800
Message-ID: 
To: "tcpm@ietf.org Extensions" 
Content-Type: multipart/alternative; boundary="00000000000008d7a205d670282a"
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Subject: Re: [tcpm] WGLC for draft-ietf-tcpm-yang-tcp-05
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--00000000000008d7a205d670282a
Content-Type: text/plain; charset="UTF-8"

Hi folks,

If you have questions, comments, suggestions, please share them.
if you think you'll need more time for this, please consult the chairs.
Thanks,
--
tcpm co-chairs

On Tue, Jan 4, 2022 at 10:25 AM Yoshifumi Nishida 
wrote:

> Hello folks,
>
> As the doc is mostly stable while there seems to be on-going discussions, we've
> decided to initiate a WGLC for draft-ietf-tcpm-yang-tcp-05
> Please send your feedback to the ML.
> The WGLC runs until *Jan 25*.
>
> The URL for the doc is
> https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-yang-tcp-05
> We appreciate your cooperation!
> --
> tcpm co-chairs
>

--00000000000008d7a205d670282a
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Hi folks,

<=
/div>
If you have questions, comments, suggestions, please share them.<=
/div>
if you think you'll need more time for=C2=A0this, please cons=
ult=C2=A0the chairs.
Thanks,
--
tcpm co-c=
hairs

On Tue, Jan 4, 2022 at 10:25 AM Yoshifumi Nishida <nsd.ietf@gmail.com> wrote:
<=
div dir=3D"ltr">Hello folks,

As the=
 doc is mostly stable while there seems to be on-going discussions,=C2=A0we've decided to=C2=
=A0initiate=C2=A0a=C2=A0WGLC=C2=A0for=C2=A0draft-ietf-tcpm-yang-tcp-05
Please send your feedback to the ML.
The=C2=A0WGLC=C2=A0runs until *Jan =
25*.=C2=A0

We appreciate your cooperation!
--
tcpm co-chairs




--00000000000008d7a205d670282a--


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Subject: [tcpm] I-D Action: draft-ietf-tcpm-rfc8312bis-06.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the TCP Maintenance and Minor Extensions WG of the IETF.

        Title           : CUBIC for Fast and Long-Distance Networks
        Authors         : Lisong Xu
                          Sangtae Ha
                          Injong Rhee
                          Vidhi Goel
                          Lars Eggert
	Filename        : draft-ietf-tcpm-rfc8312bis-06.txt
	Pages           : 35
	Date            : 2022-01-26

Abstract:
   CUBIC is a standard TCP congestion control algorithm that uses a
   cubic function instead of a linear congestion window increase
   function to improve scalability and stability over fast and long-
   distance networks.  CUBIC has been adopted as the default TCP
   congestion control algorithm by the Linux, Windows, and Apple stacks.

   This document updates the specification of CUBIC to include
   algorithmic improvements based on these implementations and recent
   academic work.  Based on the extensive deployment experience with
   CUBIC, it also moves the specification to the Standards Track,
   obsoleting RFC 8312.  This also requires updating RFC 5681, to allow
   for CUBIC's occasionally more aggressive sending behavior.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-tcpm-rfc8312bis/

There is also an HTML version available at:
https://www.ietf.org/archive/id/draft-ietf-tcpm-rfc8312bis-06.html

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-rfc8312bis-06


Internet-Drafts are also available by rsync at rsync.ietf.org::internet-drafts



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Hi,

this -06 version rolls in all the changes requested during (and after) =
WGLC ended.

I'll leave it up to the chairs to decide if another WGLC is warranted or =
the document can progress as-is.

Thanks,
Lars


> On 2022-1-26, at 11:12, internet-drafts@ietf.org wrote:
>=20
>=20
> A New Internet-Draft is available from the on-line Internet-Drafts =
directories.
> This draft is a work item of the TCP Maintenance and Minor Extensions =
WG of the IETF.
>=20
>        Title           : CUBIC for Fast and Long-Distance Networks
>        Authors         : Lisong Xu
>                          Sangtae Ha
>                          Injong Rhee
>                          Vidhi Goel
>                          Lars Eggert
> 	Filename        : draft-ietf-tcpm-rfc8312bis-06.txt
> 	Pages           : 35
> 	Date            : 2022-01-26
>=20
> Abstract:
>   CUBIC is a standard TCP congestion control algorithm that uses a
>   cubic function instead of a linear congestion window increase
>   function to improve scalability and stability over fast and long-
>   distance networks.  CUBIC has been adopted as the default TCP
>   congestion control algorithm by the Linux, Windows, and Apple =
stacks.
>=20
>   This document updates the specification of CUBIC to include
>   algorithmic improvements based on these implementations and recent
>   academic work.  Based on the extensive deployment experience with
>   CUBIC, it also moves the specification to the Standards Track,
>   obsoleting RFC 8312.  This also requires updating RFC 5681, to allow
>   for CUBIC's occasionally more aggressive sending behavior.
>=20
>=20
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-tcpm-rfc8312bis/
>=20
> There is also an HTML version available at:
> https://www.ietf.org/archive/id/draft-ietf-tcpm-rfc8312bis-06.html
>=20
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-tcpm-rfc8312bis-06
>=20
>=20
> Internet-Drafts are also available by rsync at =
rsync.ietf.org::internet-drafts
>=20
>=20
> _______________________________________________
> tcpm mailing list
> tcpm@ietf.org
> https://www.ietf.org/mailman/listinfo/tcpm


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In-Reply-To: 
From: Yoshifumi Nishida 
Date: Thu, 27 Jan 2022 00:02:43 -0800
Message-ID: 
To: Lars Eggert 
Cc: "tcpm@ietf.org Extensions" 
Content-Type: multipart/alternative; boundary="000000000000e41fd105d68bbe9c"
Archived-At: 
Subject: Re: [tcpm] I-D Action: draft-ietf-tcpm-rfc8312bis-06.txt
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--000000000000e41fd105d68bbe9c
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Hi Lars,

Thanks for updating the draft.
There seems to be lots of discussions and updates. So, if possible, I think
it would be great if there's highlights for the major updates.

Also, I am wondering if https://github.com/NTAP/rfc8312bis/issues/135 has
been solved completely.
Have we decided to leave this part as it is? We don't need any texts here
or are there any future plans?

Thanks,
--
Yoshi


On Wed, Jan 26, 2022 at 2:50 AM Lars Eggert  wrote:

> Hi,
>
> this -06 version rolls in all the changes requested during (and after)
> WGLC ended.
>
> I'll leave it up to the chairs to decide if another WGLC is warranted or
> the document can progress as-is.
>
> Thanks,
> Lars
>
>
> > On 2022-1-26, at 11:12, internet-drafts@ietf.org wrote:
> >
> >
> > A New Internet-Draft is available from the on-line Internet-Drafts
> directories.
> > This draft is a work item of the TCP Maintenance and Minor Extensions WG
> of the IETF.
> >
> >        Title           : CUBIC for Fast and Long-Distance Networks
> >        Authors         : Lisong Xu
> >                          Sangtae Ha
> >                          Injong Rhee
> >                          Vidhi Goel
> >                          Lars Eggert
> >       Filename        : draft-ietf-tcpm-rfc8312bis-06.txt
> >       Pages           : 35
> >       Date            : 2022-01-26
> >
> > Abstract:
> >   CUBIC is a standard TCP congestion control algorithm that uses a
> >   cubic function instead of a linear congestion window increase
> >   function to improve scalability and stability over fast and long-
> >   distance networks.  CUBIC has been adopted as the default TCP
> >   congestion control algorithm by the Linux, Windows, and Apple stacks.
> >
> >   This document updates the specification of CUBIC to include
> >   algorithmic improvements based on these implementations and recent
> >   academic work.  Based on the extensive deployment experience with
> >   CUBIC, it also moves the specification to the Standards Track,
> >   obsoleting RFC 8312.  This also requires updating RFC 5681, to allow
> >   for CUBIC's occasionally more aggressive sending behavior.
> >
> >
> > The IETF datatracker status page for this draft is:
> > https://datatracker.ietf.org/doc/draft-ietf-tcpm-rfc8312bis/
> >
> > There is also an HTML version available at:
> > https://www.ietf.org/archive/id/draft-ietf-tcpm-rfc8312bis-06.html
> >
> > A diff from the previous version is available at:
> > https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-rfc8312bis-06
> >
> >
> > Internet-Drafts are also available by rsync at rsync.ietf.org:
> :internet-drafts
> >
> >
> > _______________________________________________
> > tcpm mailing list
> > tcpm@ietf.org
> > https://www.ietf.org/mailman/listinfo/tcpm
>
> _______________________________________________
> tcpm mailing list
> tcpm@ietf.org
> https://www.ietf.org/mailman/listinfo/tcpm
>

--000000000000e41fd105d68bbe9c
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable


Hi Lars,

Thanks for updating=
 the draft.
There seems to be lots of discussions and updates. So=
, if possible, I think it would be great if there's highlights for the =
major updates.

Also, I am wondering if=C2=A0https://github.com/NTAP=
/rfc8312bis/issues/135 has been solved completely.=C2=A0
Have=
 we decided to leave this part as it=C2=A0is? We don't need any texts h=
ere or are there any future plans?

Thanks,
--
Yoshi


On Wed, Jan 26, 2022 at 2:50 AM Lars Eg=
gert <lars@eggert.org> wrote:<=
br>
Hi,



this -06 version rolls in all the changes requested during (and after) WGLC=
 ended.



I'll leave it up to the chairs to decide if another WGLC is warranted o=
r the document can progress as-is.



Thanks,

Lars





> On 2022-1-26, at 11:12, internet-drafts@ietf.org wrote:

> 

> 

> A New Internet-Draft is available from the on-line Internet-Drafts dir=
ectories.

> This draft is a work item of the TCP Maintenance and Minor Extensions =
WG of the IETF.

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 Title=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0: CUBIC for Fast and Long-Distance Networks

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 Authors=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0: =
Lisong Xu

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 Sangtae Ha

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 Injong Rhee

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 Vidhi Goel

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 Lars Eggert

>=C2=A0 =C2=A0 =C2=A0 =C2=A0Filename=C2=A0 =C2=A0 =C2=A0 =C2=A0 : draft-=
ietf-tcpm-rfc8312bis-06.txt

>=C2=A0 =C2=A0 =C2=A0 =C2=A0Pages=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0: 35

>=C2=A0 =C2=A0 =C2=A0 =C2=A0Date=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 : 2022-01-26

> 

> Abstract:

>=C2=A0 =C2=A0CUBIC is a standard TCP congestion control algorithm that =
uses a

>=C2=A0 =C2=A0cubic function instead of a linear congestion window incre=
ase

>=C2=A0 =C2=A0function to improve scalability and stability over fast an=
d long-

>=C2=A0 =C2=A0distance networks.=C2=A0 CUBIC has been adopted as the def=
ault TCP

>=C2=A0 =C2=A0congestion control algorithm by the Linux, Windows, and Ap=
ple stacks.

> 

>=C2=A0 =C2=A0This document updates the specification of CUBIC to includ=
e

>=C2=A0 =C2=A0algorithmic improvements based on these implementations an=
d recent

>=C2=A0 =C2=A0academic work.=C2=A0 Based on the extensive deployment exp=
erience with

>=C2=A0 =C2=A0CUBIC, it also moves the specification to the Standards Tr=
ack,

>=C2=A0 =C2=A0obsoleting RFC 8312.=C2=A0 This also requires updating RFC=
 5681, to allow

>=C2=A0 =C2=A0for CUBIC's occasionally more aggressive sending behav=
ior.

> 

> 

> The IETF datatracker status page for this draft is:

> https://datatracker.ietf.org/doc/dr=
aft-ietf-tcpm-rfc8312bis/

> 

> There is also an HTML version available at:

> https://www.ietf.org/archive/=
id/draft-ietf-tcpm-rfc8312bis-06.html

> 

> A diff from the previous version is available at:

> https://www.ietf.org/rfcdiff?u=
rl2=3Ddraft-ietf-tcpm-rfc8312bis-06

> 

> 

> Internet-Drafts are also available by rsync at rsync.ietf.org::interne=
t-drafts

> 

> 

> _______________________________________________

> tcpm mailing list

> tcpm@ietf.org
> https://www.ietf.org/mailman/listinfo/tcpm



_______________________________________________

tcpm mailing list

tcpm@ietf.org

https://www.ietf.org/mailman/listinfo/tcpm




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Hi Yoshi,


> There seems to be lots of discussions and updates. So, if possible, I =
think it would be great if there's highlights for the major updates.
We provided the summary during IETF 112. And have a couple more changes. =
Here is the combined summary:
Create new subsections for spurious timeouts and spurious loss via ACK
Clarify meaning of "application-limited" in Section 5.8
Brief discussion of convergence in Section 5.6
Add more test results to Section 5 and update some references
Change wording around setting ssthresh
Updates [RFC 5681] to allow CUBIC=E2=80=99s more aggressive sending =
behavior Recommend Hystart++ for slow-start to avoid overshoot=20
Extra care must be taken so that end of slow start and the first =
multiplicative decrease work well together=20
In case of packet loss (only), sender MAY use PRR [RFC 6937] to reduce =
sending rate=20
CUBIC, like Reno has slow adaptation in wireless environments=20
Proper queue sizing and management can mitigate risk of high queuing =
delay as CUBIC fills buffer faster than Reno.=20
Reduce cwnd in response to ECE until it reaches 1 MSS and then use =
retransmit timer with exponential backoff=20
Use FlightSize instead of cwnd after a congestion event
For rate-limited apps, recommend RFC 7661 to mitigate the issue of=20
FlightSize being significantly smaller than cwndSome implementations =
currently use cwnd and may continue to do so=20
Fix a bug in average CUBIC window equation in Discussion Rephrase text =
around spurious retransmission detection algorithms=20
CUBIC=E2=80=99s response to sudden increase and decrease in capacity due =
to transient events=20
Replace ACK by =E2=80=9Cnew ACK=E2=80=9D wherever applicable and define =
it clearly Rename AIMD (TCP) -> Reno=20
Moved "MUST NOT" requirement about app-limited period from discussion to =
main congestion avoidance section
We also add diff to Appendix in the draft. =
https://www.ietf.org/archive/id/draft-ietf-tcpm-rfc8312bis-06.html#name-ev=
olution-of-cubic =


> Also, I am wondering if https://github.com/NTAP/rfc8312bis/issues/135 =
 has been solved =
completely.=20
> Have we decided to leave this part as it is? We don't need any texts =
here or are there any future plans?
We have discussed internally and decided to leave it as is. The =
justification is - there is already large scale deployment of CUBIC in =
the field with Beta_cubic =3D 0.7. We had added the below line to the =
draft as a caution. To change B_cubic for so many deployments, it would =
require a lot of experimental data and perhaps even some deployment =
experience. Such a change would be categorized as a research initiative =
before it makes it to an IETF draft.

A side effect of setting =CE=B2cubic to a value bigger than 0.5 is =
slower convergence. We believe that while a more adaptive setting of =
=CE=B2cubic could result in faster convergence, it will make the =
analysis of CUBIC much harder.

Thanks,
Vidhi

> On Jan 27, 2022, at 12:02 AM, Yoshifumi Nishida  =
wrote:
>=20
> Hi Lars,
>=20
> Thanks for updating the draft.
> There seems to be lots of discussions and updates. So, if possible, I =
think it would be great if there's highlights for the major updates.
>=20
> Also, I am wondering if https://github.com/NTAP/rfc8312bis/issues/135 =
 has been solved =
completely.=20
> Have we decided to leave this part as it is? We don't need any texts =
here or are there any future plans?
>=20
> Thanks,
> --
> Yoshi
>=20
>=20
> On Wed, Jan 26, 2022 at 2:50 AM Lars Eggert > wrote:
> Hi,
>=20
> this -06 version rolls in all the changes requested during (and after) =
WGLC ended.
>=20
> I'll leave it up to the chairs to decide if another WGLC is warranted =
or the document can progress as-is.
>=20
> Thanks,
> Lars
>=20
>=20
> > On 2022-1-26, at 11:12, internet-drafts@ietf.org =
 wrote:
> >=20
> >=20
> > A New Internet-Draft is available from the on-line Internet-Drafts =
directories.
> > This draft is a work item of the TCP Maintenance and Minor =
Extensions WG of the IETF.
> >=20
> >        Title           : CUBIC for Fast and Long-Distance Networks
> >        Authors         : Lisong Xu
> >                          Sangtae Ha
> >                          Injong Rhee
> >                          Vidhi Goel
> >                          Lars Eggert
> >       Filename        : draft-ietf-tcpm-rfc8312bis-06.txt
> >       Pages           : 35
> >       Date            : 2022-01-26
> >=20
> > Abstract:
> >   CUBIC is a standard TCP congestion control algorithm that uses a
> >   cubic function instead of a linear congestion window increase
> >   function to improve scalability and stability over fast and long-
> >   distance networks.  CUBIC has been adopted as the default TCP
> >   congestion control algorithm by the Linux, Windows, and Apple =
stacks.
> >=20
> >   This document updates the specification of CUBIC to include
> >   algorithmic improvements based on these implementations and recent
> >   academic work.  Based on the extensive deployment experience with
> >   CUBIC, it also moves the specification to the Standards Track,
> >   obsoleting RFC 8312.  This also requires updating RFC 5681, to =
allow
> >   for CUBIC's occasionally more aggressive sending behavior.
> >=20
> >=20
> > The IETF datatracker status page for this draft is:
> > https://datatracker.ietf.org/doc/draft-ietf-tcpm-rfc8312bis/ =

> >=20
> > There is also an HTML version available at:
> > https://www.ietf.org/archive/id/draft-ietf-tcpm-rfc8312bis-06.html =

> >=20
> > A diff from the previous version is available at:
> > https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-tcpm-rfc8312bis-06 =

> >=20
> >=20
> > Internet-Drafts are also available by rsync at =
rsync.ietf.org::internet-drafts
> >=20
> >=20
> > _______________________________________________
> > tcpm mailing list
> > tcpm@ietf.org 
> > https://www.ietf.org/mailman/listinfo/tcpm =

>=20
> _______________________________________________
> tcpm mailing list
> tcpm@ietf.org 
> https://www.ietf.org/mailman/listinfo/tcpm =

> _______________________________________________
> tcpm mailing list
> tcpm@ietf.org
> https://www.ietf.org/mailman/listinfo/tcpm


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Content-Type: text/html;
	charset=utf-8

Hi =
Yoshi,


There seems to be lots of =
discussions and updates. So, if possible, I think it would be great if =
there's highlights for the major updates.
We =
provided the summary during IETF 112. And have a couple more changes. =
Here is the combined summary:
  • Create new subsections for spurious timeouts and spurious =
loss via ACK
  • Clarify meaning of =
"application-limited" in Section 5.8
  • Brief discussion =
of convergence in Section 5.6
  • Add more test results =
to Section 5 and update some references
  • Change =
wording around setting ssthresh
  • Updates [RFC 5681] to =
allow CUBIC=E2=80=99s more aggressive sending behavior Recommend =
Hystart++ for slow-start to avoid overshoot 
  • Extra=
 care must be taken so that end of slow start and the first =
multiplicative decrease work well together 
  • In =
case of packet loss (only), sender MAY use PRR [RFC 6937] to reduce =
sending rate 
  • CUBIC, like Reno has slow =
adaptation in wireless environments 
  • Proper =
queue sizing and management can mitigate risk of high queuing delay as =
CUBIC fills buffer faster than Reno. 
  • Reduce cwnd in response to ECE =
until it reaches 1 MSS and then use =
retransmit timer with exponential backoff 
  • Use FlightSize instead of cwnd after a congestion event
  • For =
rate-limited apps, recommend RFC 7661 to mitigate the issue =
of 
  • FlightSize being =
significantly smaller than cwndSome =
implementations currently use cwnd and may =
continue to do so 
  • Fix a bug in average CUBIC =
window equation in Discussion Rephrase text around spurious =
retransmission detection algorithms 
  • CUBIC=E2=80=99=
s response to sudden increase and decrease in capacity due to transient =
events 
  • Replace ACK by =E2=80=9Cnew ACK=E2=80=9D =
wherever applicable and define it clearly Rename AIMD (TCP) -> =
Reno 
  • Moved "MUST NOT" requirement about =
app-limited period from discussion to main congestion avoidance =
section
We also add diff to =
Appendix in the draft. https://www.ietf.org/archive/id/draft-ietf-tcpm-rfc8312bis-06.h=
tml#name-evolution-of-cubic

Also, I am =
wondering if https://github.com/NTAP/rfc8312bis/issues/135 has =
been solved completely. 
Have we decided to =
leave this part as it is? We don't need any texts here or are there =
any future plans?
We have discussed internally =
and decided to leave it as is. The justification is - there is =
already large scale deployment =
of CUBIC in the field with Beta_cubic =3D 0.7. We had added the below =
line to the draft as a caution. To change B_cubic for so many =
deployments, it would require a lot of experimental data and perhaps =
even some deployment experience. Such a change would =
be categorized as a research initiative before it makes it to an =
IETF draft.

A side effect of =
setting =CE=B2cubic to a value bigger than 0.5 =
is slower convergence. We believe that while a more adaptive setting =
of =CE=B2cubic could result in faster =
convergence, it will make the analysis of CUBIC much =
harder.

Thanks,
Vidhi

On Jan 27, 2022, at 12:02 AM, Yoshifumi Nishida <nsd.ietf@gmail.com> =
wrote:

Hi Lars,

Thanks for updating the =
draft.
There seems to be lots of discussions and =
updates. So, if possible, I think it would be great if there's =
highlights for the major updates.

Also, I am wondering if https://github.com/NTAP/rfc8312bis/issues/135 has been =
solved completely. 
Have we decided to leave =
this part as it is? We don't need any texts here or are there any =
future plans?

Thanks,
--
Yoshi


On Wed, Jan 26, 2022 at 2:50 AM Lars Eggert <lars@eggert.org> =
wrote:
Hi,



this -06 version rolls in all the changes requested during (and after) =
WGLC ended.



I'll leave it up to the chairs to decide if another WGLC is warranted or =
the document can progress as-is.



Thanks,

Lars





> On 2022-1-26, at 11:12, internet-drafts@ietf.org wrote:

> 

> 

> A New Internet-Draft is available from the on-line Internet-Drafts =
directories.

> This draft is a work item of the TCP Maintenance and Minor =
Extensions WG of the IETF.

> 

>        Title          =
 : CUBIC for Fast and Long-Distance Networks

>        Authors        =
 : Lisong Xu

>                  =
        Sangtae Ha

>                  =
        Injong Rhee

>                  =
        Vidhi Goel

>                  =
        Lars Eggert

>       Filename        : =
draft-ietf-tcpm-rfc8312bis-06.txt

>       Pages          =
 : 35

>       Date          =
  : 2022-01-26

> 

> Abstract:

>   CUBIC is a standard TCP congestion control algorithm =
that uses a

>   cubic function instead of a linear congestion window =
increase

>   function to improve scalability and stability over fast =
and long-

>   distance networks.  CUBIC has been adopted as the =
default TCP

>   congestion control algorithm by the Linux, Windows, and =
Apple stacks.

> 

>   This document updates the specification of CUBIC to =
include

>   algorithmic improvements based on these implementations =
and recent

>   academic work.  Based on the extensive deployment =
experience with

>   CUBIC, it also moves the specification to the Standards =
Track,

>   obsoleting RFC 8312.  This also requires updating =
RFC 5681, to allow

>   for CUBIC's occasionally more aggressive sending =
behavior.

> 

> 

> The IETF datatracker status page for this draft is:

> https://datatracker.ietf.org/doc/draft-ietf-tcpm-rfc8312bis/

> 

> There is also an HTML version available at:

> https://www.ietf.org/archive/id/draft-ietf-tcpm-rfc8312bis-06.h=
tml

> 

> A diff from the previous version is available at:

> https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-tcpm-rfc8312bis-=
06

> 

> 

> Internet-Drafts are also available by rsync at rsync.ietf.org::internet-drafts

> 

> 

> _______________________________________________

> tcpm mailing list

> tcpm@ietf.org

> https://www.ietf.org/mailman/listinfo/tcpm



_______________________________________________

tcpm mailing list

tcpm@ietf.org

https://www.ietf.org/mailman/listinfo/tcpm



_______________________________________________
tcpm =
mailing list
tcpm@ietf.org
https://www.ietf.org/mailman/listinfo/tcpm

=

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Events=20

Issues
------
* NTAP/rfc8312bis (+0/-2/=F0=9F=92=AC0)
  2 issues closed:
  - "Application-Limited" seems ambiguous https://github.com/NTAP/rfc8312bi=
s/issues/137=20
  - Citing Experimental RFCs as if being a part of CUBIC https://github.com=
/NTAP/rfc8312bis/issues/90 [WG LC]=20



Pull requests
-------------
* NTAP/rfc8312bis (+1/-3/=F0=9F=92=AC2)
  1 pull requests submitted:
  - fix the changelog to put it under the righy bucket (by goelvidhi)
    https://github.com/NTAP/rfc8312bis/pull/140=20

  2 pull requests received 2 new comments:
  - #139 clarify the meaning of "application-limited" (1 by larseggert)
    https://github.com/NTAP/rfc8312bis/pull/139=20
  - #136 add new subsections for spurious timeout and spurious loss by ack =
(1 by larseggert)
    https://github.com/NTAP/rfc8312bis/pull/136=20

  3 pull requests merged:
  - fix the changelog to put it under the righy bucket
    https://github.com/NTAP/rfc8312bis/pull/140=20
  - clarify the meaning of "application-limited"
    https://github.com/NTAP/rfc8312bis/pull/139=20
  - add new subsections for spurious timeout and spurious loss by ack
    https://github.com/NTAP/rfc8312bis/pull/136=20


Repositories tracked by this digest:
-----------------------------------
* https://github.com/NTAP/rfc8312bis

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Weekly github digest (RFC8312bis Activity Summary)





Sunday January 30, 2022



Events 



Issues



NTAP/rfc8312bis (+0/-2/=F0=9F=92=AC0)



  
2 issues closed:

  




Pull requests


NTAP/rfc8312bis (+1/-3/=F0=9F=92=AC2)

  
1 pull requests submitted:

  

  
2 pull requests received 2 new comments:

  

  
3 pull requests merged:

  


  

    Repositories tracked by this digest:






--===============6644738253928644361==--


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Reviewer: Peter Yee
Review result: Ready with Nits

I am the assigned Gen-ART reviewer for this draft. The General Area
Review Team (Gen-ART) reviews all IETF documents being processed
by the IESG for the IETF Chair.  Please treat these comments just
like any other last call comments.

For more information, please see the FAQ at

.

Document: draft-ietf-tcpm-ao-test-vectors-05
Reviewer: Peter Yee
Review Date: 2022-01-30
IETF LC End Date: 2022-02-01
IESG Telechat date: Not scheduled for a telechat

Summary: This document supplies test vectors for the MTI authentication
algorithms used in the TCP Authentication Option. There are a few nits that
should be corrected prior to publication. I'm not equipped to validate the test
vectors themselves and did not attempt to do so. [Ready with nits.]

Major issues: None

Minor issues: None

Nits/editorial comments:

Page 2, Abstract: move this entire section before the "Status of this Memo"
section, as required by RFC 7322, section 4.

Page 4, first full paragraph: move "[RFC6978]" after "experimental extension"
to avoid confusion.

Page 10, section 5, 1st paragraph: add a period at the end of the sentence.

Page 20, section 7, 1st sentence: add a period at the end of the sentence.

Page 24, section 8.2: add a comma after "e.g.".

Page 25, section 8.4, 2nd bullet item: change "to" to "in".

Page 25, section 8.4, 3rd bullet item: change first "to" to "in".

Page 25, section 9, 2nd paragraph: between the usage in section 3.1.1 and here,
choose a consistent case for "master_key". I know, RFC 5926 (Master_Key) and
RFC 5925 (master_key) are not consistent between themselves.




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Hi, Peter,

Many thanks for the edit suggestions.

All were implemented, though:
	- reference to RFC 6978 was moved after the word =E2=80=99traversa=
l=E2=80=99 for clarity
	- master_key is capitalized in the same way as RFC5925, i.e., =
all lower-case,
	except when starting a bullet or sentence, where it has an =
initial capital=20

An update should appear as -06 very shortly.

Joe

=E2=80=94
Joe Touch, temporal epistemologist
www.strayalpha.com

> On Jan 30, 2022, at 2:25 PM, Peter Yee via Datatracker =
 wrote:
>=20
> Reviewer: Peter Yee
> Review result: Ready with Nits
>=20
> I am the assigned Gen-ART reviewer for this draft. The General Area
> Review Team (Gen-ART) reviews all IETF documents being processed
> by the IESG for the IETF Chair.  Please treat these comments just
> like any other last call comments.
>=20
> For more information, please see the FAQ at
>=20
> .
>=20
> Document: draft-ietf-tcpm-ao-test-vectors-05
> Reviewer: Peter Yee
> Review Date: 2022-01-30
> IETF LC End Date: 2022-02-01
> IESG Telechat date: Not scheduled for a telechat
>=20
> Summary: This document supplies test vectors for the MTI =
authentication
> algorithms used in the TCP Authentication Option. There are a few nits =
that
> should be corrected prior to publication. I'm not equipped to validate =
the test
> vectors themselves and did not attempt to do so. [Ready with nits.]
>=20
> Major issues: None
>=20
> Minor issues: None
>=20
> Nits/editorial comments:
>=20
> Page 2, Abstract: move this entire section before the "Status of this =
Memo"
> section, as required by RFC 7322, section 4.
>=20
> Page 4, first full paragraph: move "[RFC6978]" after "experimental =
extension"
> to avoid confusion.
>=20
> Page 10, section 5, 1st paragraph: add a period at the end of the =
sentence.
>=20
> Page 20, section 7, 1st sentence: add a period at the end of the =
sentence.
>=20
> Page 24, section 8.2: add a comma after "e.g.".
>=20
> Page 25, section 8.4, 2nd bullet item: change "to" to "in".
>=20
> Page 25, section 8.4, 3rd bullet item: change first "to" to "in".
>=20
> Page 25, section 9, 2nd paragraph: between the usage in section 3.1.1 =
and here,
> choose a consistent case for "master_key". I know, RFC 5926 =
(Master_Key) and
> RFC 5925 (master_key) are not consistent between themselves.
>=20
>=20
>=20
> --=20
> last-call mailing list
> last-call@ietf.org
> https://www.ietf.org/mailman/listinfo/last-call


--Apple-Mail=_981D9F2C-6E0D-474C-8770-30809434E07A
Content-Transfer-Encoding: quoted-printable
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	charset=utf-8

Hi, =
Peter,

Many thanks =
for the edit suggestions.

All were implemented, though:
	=
- reference to RFC 6978 was moved after the word =
=E2=80=99traversal=E2=80=99 for clarity
	- =
master_key is capitalized in the same way as RFC5925, i.e., all =
lower-case,
	except when starting a bullet or =
sentence, where it has an initial capital 

An update should appear as -06 very =
shortly.

Joe



=E2=80=94
Joe Touch, =
temporal epistemologist
www.strayalpha.com





On Jan 30, 2022, at 2:25 PM, Peter Yee via Datatracker <noreply@ietf.org> =
wrote:

Reviewer: Peter Yee
Review result: Ready with =
Nits

I am the assigned Gen-ART reviewer for =
this draft. The General Area
Review Team (Gen-ART) reviews =
all IETF documents being processed
by the IESG for the =
IETF Chair.  Please treat these comments just
like =
any other last call comments.

For more =
information, please see the FAQ at

<https://trac.ietf.org/trac/gen/wiki/GenArtfaq>.

Document: =
draft-ietf-tcpm-ao-test-vectors-05
Reviewer: Peter Yee
Review Date: 2022-01-30
IETF LC End Date: =
2022-02-01
IESG Telechat date: Not scheduled for a =
telechat

Summary: This document supplies =
test vectors for the MTI authentication
algorithms used in =
the TCP Authentication Option. There are a few nits that
should be corrected prior to publication. I'm not equipped to =
validate the test
vectors themselves and did not attempt =
to do so. [Ready with nits.]

Major issues: =
None

Minor issues: None

Nits/editorial comments:

Page 2, =
Abstract: move this entire section before the "Status of this Memo"
section, as required by RFC 7322, section 4.

Page 4, first full paragraph: move "[RFC6978]" after =
"experimental extension"
to avoid confusion.

Page 10, section 5, 1st paragraph: add a =
period at the end of the sentence.

Page 20, =
section 7, 1st sentence: add a period at the end of the sentence.

Page 24, section 8.2: add a comma after =
"e.g.".

Page 25, section 8.4, 2nd bullet =
item: change "to" to "in".

Page 25, section =
8.4, 3rd bullet item: change first "to" to "in".

Page 25, section 9, 2nd paragraph: between the usage in =
section 3.1.1 and here,
choose a consistent case for =
"master_key". I know, RFC 5926 (Master_Key) and
RFC 5925 =
(master_key) are not consistent between themselves.



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From nobody Sun Jan 30 17:34:05 2022
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Subject: [tcpm] I-D Action: draft-ietf-tcpm-ao-test-vectors-06.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the TCP Maintenance and Minor Extensions WG of the IETF.

        Title           : TCP-AO Test Vectors
        Authors         : Joe Touch
                          Juhamatti Kuusisaari
	Filename        : draft-ietf-tcpm-ao-test-vectors-06.txt
	Pages           : 27
	Date            : 2022-01-30

Abstract:
   This document provides test vectors to validate implementations of
   the two mandatory authentication algorithms specified for the TCP
   Authentication Option over both IPv4 and IPv6. This includes
   validation of the key derivation function (KDF) based on a set of
   test connection parameters as well as validation of the message
   authentication code (MAC). Vectors are provided for both currently
   required pairs of KDF and MAC algorithms: KDF_HMAC_SHA1 and HMAC-
   SHA-1-96, and KDF_AES_128_CMAC and AES-128-CMAC-96. The vectors also
   validate both whole TCP segments as well as segments whose options
   are excluded for middlebox traversal.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-tcpm-ao-test-vectors/

There is also an htmlized version available at:
https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-ao-test-vectors-06

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-ao-test-vectors-06


Internet-Drafts are also available by rsync at rsync.ietf.org::internet-drafts



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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the TCP Maintenance and Minor Extensions WG of the IETF.

        Title           : ECN++: Adding Explicit Congestion Notification (ECN) to TCP Control Packets
        Authors         : Marcelo Bagnulo
                          Bob Briscoe
	Filename        : draft-ietf-tcpm-generalized-ecn-09.txt
	Pages           : 49
	Date            : 2022-01-31

Abstract:
   This document describes an experimental modification to ECN when used
   with TCP.  It allows the use of ECN on the following TCP packets:
   SYNs, pure ACKs, Window probes, FINs, RSTs and retransmissions.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-tcpm-generalized-ecn/

There is also an HTML version available at:
https://www.ietf.org/archive/id/draft-ietf-tcpm-generalized-ecn-09.html

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-generalized-ecn-09


Internet-Drafts are also available by rsync at rsync.ietf.org::internet-drafts



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Subject: Re: [tcpm] New Version Notification for draft-ietf-tcpm-generalized-ecn-09.txt
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tcpm,

This new revision is primarily a refresh to head-off impending expiry.

Summary of diffs:

* Explained:
                 Table 1 does not imply any obligation to set any packet to
                 ECT.  ECN++ removes the restrictions that RFC 3168 
places against
                 setting ECT on these types of packets, and an 
implementation would
                 normally be expected to take advantage of this, but it 
does not have to.

* Deleted 'experimental' from description of AccECN since the WG decided 
it ought to be intended for Proposed Std.

All the other diffs are artefacts of the switch from V2 to V3 RFC XML.

Cheers


Bob


On 31/01/2022 22:53, internet-drafts@ietf.org wrote:
> A new version of I-D, draft-ietf-tcpm-generalized-ecn-09.txt
> has been successfully submitted by Bob Briscoe and posted to the
> IETF repository.
>
> Name:		draft-ietf-tcpm-generalized-ecn
> Revision:	09
> Title:		ECN++: Adding Explicit Congestion Notification (ECN) to TCP Control Packets
> Document date:	2022-01-31
> Group:		tcpm
> Pages:		49
> URL:            https://www.ietf.org/archive/id/draft-ietf-tcpm-generalized-ecn-09.txt
> Status:         https://datatracker.ietf.org/doc/draft-ietf-tcpm-generalized-ecn/
> Html:           https://www.ietf.org/archive/id/draft-ietf-tcpm-generalized-ecn-09.html
> Htmlized:       https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-generalized-ecn
> Diff:           https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-generalized-ecn-09
>
> Abstract:
>     This document describes an experimental modification to ECN when used
>     with TCP.  It allows the use of ECN on the following TCP packets:
>     SYNs, pure ACKs, Window probes, FINs, RSTs and retransmissions.
>
>                                                                                    
>
>
> The IETF Secretariat
>
>

-- 
________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/


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Date: Mon, 31 Jan 2022 23:43:12 -0800
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To: "tcpm@ietf.org Extensions" 
Cc: tcpm-chairs 
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Subject: [tcpm] 2nd WGLC for draft-ietf-tcpm-rfc8312bis
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--0000000000003ed7de05d6f00ef3
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Hello,

After some discussions among chairs, we decided to run the 2nd WGLC on
draft-ietf-tcpm-rfc8312bis in consideration of the importance of the draft.
We'll be grateful if you could send your feedback to the ML. The WGLC runs
until *Feb 11*.

If interested, you can check in-depth past discussions in the following URL.
https://github.com/NTAP/rfc8312bis/

Thank you so much!
--
tcpm co-chairs


On Wed, Jan 26, 2022 at 2:50 AM Lars Eggert  wrote:

> Hi,
>
> this -06 version rolls in all the changes requested during (and after)
> WGLC ended.
>
> I'll leave it up to the chairs to decide if another WGLC is warranted or
> the document can progress as-is.
>
> Thanks,
> Lars
>
>
> > On 2022-1-26, at 11:12, internet-drafts@ietf.org wrote:
> >
> >
> > A New Internet-Draft is available from the on-line Internet-Drafts
> directories.
> > This draft is a work item of the TCP Maintenance and Minor Extensions WG
> of the IETF.
> >
> >        Title           : CUBIC for Fast and Long-Distance Networks
> >        Authors         : Lisong Xu
> >                          Sangtae Ha
> >                          Injong Rhee
> >                          Vidhi Goel
> >                          Lars Eggert
> >       Filename        : draft-ietf-tcpm-rfc8312bis-06.txt
> >       Pages           : 35
> >       Date            : 2022-01-26
> >
> > Abstract:
> >   CUBIC is a standard TCP congestion control algorithm that uses a
> >   cubic function instead of a linear congestion window increase
> >   function to improve scalability and stability over fast and long-
> >   distance networks.  CUBIC has been adopted as the default TCP
> >   congestion control algorithm by the Linux, Windows, and Apple stacks.
> >
> >   This document updates the specification of CUBIC to include
> >   algorithmic improvements based on these implementations and recent
> >   academic work.  Based on the extensive deployment experience with
> >   CUBIC, it also moves the specification to the Standards Track,
> >   obsoleting RFC 8312.  This also requires updating RFC 5681, to allow
> >   for CUBIC's occasionally more aggressive sending behavior.
> >
> >
> > The IETF datatracker status page for this draft is:
> > https://datatracker.ietf.org/doc/draft-ietf-tcpm-rfc8312bis/
> >
> > There is also an HTML version available at:
> > https://www.ietf.org/archive/id/draft-ietf-tcpm-rfc8312bis-06.html
> >
> > A diff from the previous version is available at:
> > https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-rfc8312bis-06
> >
> >
> > Internet-Drafts are also available by rsync at rsync.ietf.org:
> :internet-drafts
> >
> >
> > _______________________________________________
> > tcpm mailing list
> > tcpm@ietf.org
> > https://www.ietf.org/mailman/listinfo/tcpm
>
> _______________________________________________
> tcpm mailing list
> tcpm@ietf.org
> https://www.ietf.org/mailman/listinfo/tcpm
>

--0000000000003ed7de05d6f00ef3
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable


Hello,

After some discussion=
s among chairs, we decided to run the 2nd WGLC on draft-ietf-tcpm-rfc8312bi=
s in consideration of the importance of the draft.=C2=A0
We'l=
l be grateful if you could send your feedback to the ML. The WGLC runs unti=
l *Feb 11*.

If interested, you can check in-depth =
past discussions in the following URL.

Thank you so much!
--
tcpm co-chairs


On Wed, Jan 26, 2022 at 2:50 AM Lars Eggert <lars@eggert.org> wrote:
Hi,



this -06 version rolls in all the changes requested during (and after) WGLC=
 ended.



I'll leave it up to the chairs to decide if another WGLC is warranted o=
r the document can progress as-is.



Thanks,

Lars





> On 2022-1-26, at 11:12, internet-drafts@ietf.org wrote:

> 

> 

> A New Internet-Draft is available from the on-line Internet-Drafts dir=
ectories.

> This draft is a work item of the TCP Maintenance and Minor Extensions =
WG of the IETF.

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 Title=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0: CUBIC for Fast and Long-Distance Networks

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 Authors=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0: =
Lisong Xu

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 Sangtae Ha

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 Injong Rhee

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 Vidhi Goel

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 Lars Eggert

>=C2=A0 =C2=A0 =C2=A0 =C2=A0Filename=C2=A0 =C2=A0 =C2=A0 =C2=A0 : draft-=
ietf-tcpm-rfc8312bis-06.txt

>=C2=A0 =C2=A0 =C2=A0 =C2=A0Pages=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0: 35

>=C2=A0 =C2=A0 =C2=A0 =C2=A0Date=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 : 2022-01-26

> 

> Abstract:

>=C2=A0 =C2=A0CUBIC is a standard TCP congestion control algorithm that =
uses a

>=C2=A0 =C2=A0cubic function instead of a linear congestion window incre=
ase

>=C2=A0 =C2=A0function to improve scalability and stability over fast an=
d long-

>=C2=A0 =C2=A0distance networks.=C2=A0 CUBIC has been adopted as the def=
ault TCP

>=C2=A0 =C2=A0congestion control algorithm by the Linux, Windows, and Ap=
ple stacks.

> 

>=C2=A0 =C2=A0This document updates the specification of CUBIC to includ=
e

>=C2=A0 =C2=A0algorithmic improvements based on these implementations an=
d recent

>=C2=A0 =C2=A0academic work.=C2=A0 Based on the extensive deployment exp=
erience with

>=C2=A0 =C2=A0CUBIC, it also moves the specification to the Standards Tr=
ack,

>=C2=A0 =C2=A0obsoleting RFC 8312.=C2=A0 This also requires updating RFC=
 5681, to allow

>=C2=A0 =C2=A0for CUBIC's occasionally more aggressive sending behav=
ior.

> 

> 

> The IETF datatracker status page for this draft is:

> https://datatracker.ietf.org/doc/dr=
aft-ietf-tcpm-rfc8312bis/

> 

> There is also an HTML version available at:

> https://www.ietf.org/archive/=
id/draft-ietf-tcpm-rfc8312bis-06.html

> 

> A diff from the previous version is available at:

> https://www.ietf.org/rfcdiff?u=
rl2=3Ddraft-ietf-tcpm-rfc8312bis-06

> 

> 

> Internet-Drafts are also available by rsync at rsync.ietf.org::interne=
t-drafts

> 

> 

> _______________________________________________

> tcpm mailing list

> tcpm@ietf.org
> https://www.ietf.org/mailman/listinfo/tcpm



_______________________________________________

tcpm mailing list

tcpm@ietf.org

https://www.ietf.org/mailman/listinfo/tcpm




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From: Yoshifumi Nishida 
Date: Mon, 31 Jan 2022 23:49:27 -0800
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To: "tcpm@ietf.org Extensions" 
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Subject: Re: [tcpm] WGLC for draft-ietf-tcpm-yang-tcp-05
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--000000000000a0bfe905d6f024a0
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Hi folks,

As all comments have been addressed, we decided to conclude the WGLC for
this draft.
We'll proceed to the next step soon.

Thank you so much,
--
tcpm co-chairs

On Tue, Jan 25, 2022 at 3:07 PM Yoshifumi Nishida 
wrote:

> Hi folks,
>
> If you have questions, comments, suggestions, please share them.
> if you think you'll need more time for this, please consult the chairs.
> Thanks,
> --
> tcpm co-chairs
>
> On Tue, Jan 4, 2022 at 10:25 AM Yoshifumi Nishida 
> wrote:
>
>> Hello folks,
>>
>> As the doc is mostly stable while there seems to be on-going discussions, we've
>> decided to initiate a WGLC for draft-ietf-tcpm-yang-tcp-05
>> Please send your feedback to the ML.
>> The WGLC runs until *Jan 25*.
>>
>> The URL for the doc is
>> https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-yang-tcp-05
>> We appreciate your cooperation!
>> --
>> tcpm co-chairs
>>
>

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Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable


Hi folks,

<=
/div>
As all comments have been addressed, we decided to conclude the W=
GLC for this draft.
We'll proceed to the next step soon.
<=
/div>

Thank you so much,
--
tcpm co-=
chairs

On Tue, Jan 25, 2022 at 3:07 PM Yoshifumi Nishida <nsd.ietf@gmail.com> wrote:
=
Hi folks,

If you have questions, c=
omments, suggestions, please share them.
if you think you'll =
need more time for=C2=A0this, please consult=C2=A0the chairs.
Tha=
nks,
--
tcpm co-chairs

On Tue, Jan 4, 2022 at 10:25 =
AM Yoshifumi Nishida <nsd.ietf@gmail.com> wrote:
=
Hello folks,

As the doc is mostly s=
table while there seems to be on-going discussions,=C2=A0we've decided to=C2=A0initiate=C2=A0a=
=C2=A0WGLC=C2=A0for=C2=A0draft-ietf-tcp=
m-yang-tcp-05
Please send yo=
ur feedback to the ML.
The=C2=A0WGLC=C2=A0runs until *Jan 25*.=C2=A0







--000000000000a0bfe905d6f024a0--