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From: Brian Trammell <ietf@trammell.ch>
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Subject: [Tsv-art] TSV-ART review of draft-ietf-dnsop-dnssec-roadblock-avoidance
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Greetings,

I've reviewed this draft as part of the TSV Area Review Team, paying =
special attention to transport-related concerns. Please take these as =
any other IETF last call comments.

Summary: This draft clearly describes online testing of possible DNSSEC =
failures, and how to interpret the results. It does not appear to pose =
any transport-related danger, and is broadly ready for publication as a =
BCP.

I do have the following questions, though:

(1) Section 3.1: "The tests are designed to check for one feature at a =
time". This is generally A Good Thing, but it does seem that there =
should be some attempt to economize on packets sent. This is not as much =
a problem when testing recursive resolvers, since they should only need =
to be run when a host introduces itself to a neighboring recursive =
resolver and the test traffic shouldn't leave the site. However, section =
3.2 are designed to run on the open Internet, and seems to suggests that =
tests 3.2.1-3.2.3 should be run *first*, then followed by the fourteen =
tests in section 3.1. In the "best case" future for this document, that =
every stub resolver implements this online testing automatically, every =
packet saved is significant.

Some optimizations are obvious: 3.2.1 replaces 3.1.1, 3.2.3 replaces =
3.1.2. The document should note these (even though they're trivial). =
Some optimizations have already been made: 3.1.5, 3.1.10, 3.3. test =
multiple conditions. Are there any other tests that could be combined =
(e.g. the TCP connectivity and EDNS0 tests) without losing fidelity?

(2) Could the retries advised in section 5 be abused to cause a resolver =
running roadblock avoidance to send unnecessary test traffic? It seems =
that injecting an error, illegal, or bogus response could induce =
multiple retries, though it's not clear that the amplification factor =
makes this worth it.

(2) In section 6, the draft raises the possibility of unstable =
networking after connection (e.g. in a captive portal situation); =
guidance to refrain from flooding the network with test traffic during =
this instability might be useful. Perhaps explicitly link the DNSSEC =
checks to a "network proves to be usable" signal (either from the =
application or the operating system)?

Thanks, cheers,

Brian (as TSV-ART reviewer)

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From nobody Wed Jun 15 02:25:09 2016
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To: Joe Touch <touch@isi.edu>, Martin Stiemerling <mls.ietf@gmail.com>, tsv-art@ietf.org
References: <b94af9e1-379a-4ece-301d-706d5d752473@gmail.com> <031bfb41-8ebc-cc8f-103d-1f701ad32b30@gmail.com> <5760ECFF.70306@isi.edu>
From: =?UTF-8?Q?Mirja_K=c3=bchlewind?= <mirja.kuehlewind@tik.ee.ethz.ch>
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Date: Wed, 15 Jun 2016 11:25:03 +0200
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Subject: Re: [Tsv-art] Fwd: Help needed: TSV Triage team: Review of IETF LC documents (as of 06/14)
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Hi Joe,

we already got an review from Brian for 
draft-ietf-dnsop-dnssec-roadblock-avoidance (thanks!).

Joylan Furtado agreed to provide a review for draft-ietf-forces-interfelfb. 
However, this mail went to the wrong list and he is not a member of the ART, 
so I would be glad if you could provide a review for that one. Thanks!

Mirja


On 15.06.2016 07:51, Joe Touch wrote:
> I can help with either of the items below if needed. I don't have
> context on any of these, though, so if others do, I'll defer to them first.
>
> Joe
>
> On 6/14/2016 12:17 AM, Martin Stiemerling wrote:
>> - draft-ietf-dnsop-dnssec-roadblock-avoidance
>> - draft-ietf-forces-interfelfb


From nobody Wed Jun 15 15:41:28 2016
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From: Joe Touch <touch@isi.edu>
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Subject: [Tsv-art] TSV-ART review of draft-ietf-forces-interfelfb
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Hi, all,

I've reviewed this draft as part of the TSV Area Review Team, paying
special attention to transport-related concerns. Please take these as
any other IETF last call comments.

Joe

---

The document contains two different types of transport issues: its
relation to supporting transport traffic and the way it exchanges
information between the FEs.

The document's discussion of the impact on supporting transport traffic
is sufficient. I'm not sure I concur with citing RFC5405bis as
informational, because the correctness of the proposed approach to
congestion control relies directly on definitions of controlled
environments available only in the -bis update. I would prefer that
claims using normative language necessitate using cited references as
Normative.

The document uses Ethernet as a "transport", as stated in Sec 3.1.1. The
claim that this is "simpler" than using UDP would benefit from a few
sentences of substantiation, especially because Ethernet does not
support fragmentation, which has an impact on the solutions proposed in
Sec 5.1.1 (see below).

Sec 5.1.3 indicates that packet sizes increase due to the ForCES
metadata (using encapsulation indicated in Sec 5.2), which could exceed
the Ethernet MTU as noted in Sec 5.1.1. Sec 5.1.1 suggests an approach
of falsifying MTU information, but this could also result in a reported
Ethernet MTU below the required minimum of 1500. This case should be
addressed in Sec 5.1.1.

Other comments:

Sec 5.2: The Ethertype listed should be replaced with "Ethertype-TBD"
with a corresponding note to update that text in Sec 9 / IEEE Assignment
Considerations. The draft should not use a specific unassigned value,
even if currently available, until assigned. (it currently cites
0xFEFE).  This section should also refer to the Metadata IDs directly,
either by name or by registry, as if assuming that IANA has created that
registry.

---




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From: Jamal Hadi Salim <hadi@mojatatu.com>
Date: Fri, 17 Jun 2016 08:12:32 -0400
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Subject: Re: [Tsv-art] TSV-ART review of draft-ietf-forces-interfelfb
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Hi Joe,
Thanks for your review - responses below:

On Wed, Jun 15, 2016 at 6:40 PM, Joe Touch <touch@isi.edu> wrote:

> Hi, all,
>
> I've reviewed this draft as part of the TSV Area Review Team, paying
> special attention to transport-related concerns. Please take these as
> any other IETF last call comments.
>
> Joe
>
> ---
>
> The document contains two different types of transport issues: its
> relation to supporting transport traffic and the way it exchanges
> information between the FEs.
>
> The document's discussion of the impact on supporting transport traffic
> is sufficient. I'm not sure I concur with citing RFC5405bis as
> informational, because the correctness of the proposed approach to
> congestion control relies directly on definitions of controlled
> environments available only in the -bis update. I would prefer that
> claims using normative language necessitate using cited references as
> Normative.
>
>
This has come up before. So i think we'll just make it a normative reference
in the next update (which i plan to publish after this discussion)


> The document uses Ethernet as a "transport", as stated in Sec 3.1.1. The
> claim that this is "simpler" than using UDP would benefit from a few
> sentences of substantiation, especially because Ethernet does not
> support fragmentation, which has an impact on the solutions proposed in
> Sec 5.1.1 (see below).
>

The reference point is the common deployment use cases; within a single
rack or network owned by one admin who does all the setup.
Any suggestion on wording you'd like to see?


> Sec 5.1.3 indicates that packet sizes increase due to the ForCES
> metadata (using encapsulation indicated in Sec 5.2), which could exceed
> the Ethernet MTU as noted in Sec 5.1.1. Sec 5.1.1 suggests an approach
> of falsifying MTU information, but this could also result in a reported
> Ethernet MTU below the required minimum of 1500. This case should be
> addressed in Sec 5.1.1.
>
>
Thanks. Will fix.


> Other comments:
>
> Sec 5.2: The Ethertype listed should be replaced with "Ethertype-TBD"
> with a corresponding note to update that text in Sec 9 / IEEE Assignment
> Considerations. The draft should not use a specific unassigned value,
> even if currently available, until assigned. (it currently cites
> 0xFEFE).  This section should also refer to the Metadata IDs directly,
> either by name or by registry, as if assuming that IANA has created that
> registry.
>
>
Yes, this also came up in earlier review.  I will upload with this fixed
as well.

Thanks again Joe for taking the time.

cheers,
jamal

---
>
>
>
>

--001a113a49361a6f6205357846de
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Joe,<div>Thanks for your review - responses below:</div=
><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Wed, Jun 15, =
2016 at 6:40 PM, Joe Touch <span dir=3D"ltr">&lt;<a href=3D"mailto:touch@is=
i.edu" target=3D"_blank">touch@isi.edu</a>&gt;</span> wrote:<br><blockquote=
 class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc soli=
d;padding-left:1ex">Hi, all,<br>
<br>
I&#39;ve reviewed this draft as part of the TSV Area Review Team, paying<br=
>
special attention to transport-related concerns. Please take these as<br>
any other IETF last call comments.<br>
<br>
Joe<br>
<br>
---<br>
<br>
The document contains two different types of transport issues: its<br>
relation to supporting transport traffic and the way it exchanges<br>
information between the FEs.<br>
<br>
The document&#39;s discussion of the impact on supporting transport traffic=
<br>
is sufficient. I&#39;m not sure I concur with citing RFC5405bis as<br>
informational, because the correctness of the proposed approach to<br>
congestion control relies directly on definitions of controlled<br>
environments available only in the -bis update. I would prefer that<br>
claims using normative language necessitate using cited references as<br>
Normative.<br>
<br></blockquote><div><br></div><div>This has come up before. So i think we=
&#39;ll just make it a normative reference</div><div>in the next update (wh=
ich i plan to publish after this discussion)</div><div>=C2=A0</div><blockqu=
ote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc s=
olid;padding-left:1ex">
The document uses Ethernet as a &quot;transport&quot;, as stated in Sec 3.1=
.1. The<br>
claim that this is &quot;simpler&quot; than using UDP would benefit from a =
few<br>
sentences of substantiation, especially because Ethernet does not<br>
support fragmentation, which has an impact on the solutions proposed in<br>
Sec 5.1.1 (see below).<br></blockquote><div><br></div><div>The reference po=
int is the common deployment use cases; within a single</div><div>rack or n=
etwork owned by one admin who does all the setup.</div><div>Any suggestion =
on wording you&#39;d like to see?</div><div>=C2=A0<br></div><blockquote cla=
ss=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;pa=
dding-left:1ex">
Sec 5.1.3 indicates that packet sizes increase due to the ForCES<br>
metadata (using encapsulation indicated in Sec 5.2), which could exceed<br>
the Ethernet MTU as noted in Sec 5.1.1. Sec 5.1.1 suggests an approach<br>
of falsifying MTU information, but this could also result in a reported<br>
Ethernet MTU below the required minimum of 1500. This case should be<br>
addressed in Sec 5.1.1.<br>
<br></blockquote><div><br></div><div>Thanks. Will fix.</div><div>=C2=A0</di=
v><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:=
1px #ccc solid;padding-left:1ex">
Other comments:<br>
<br>
Sec 5.2: The Ethertype listed should be replaced with &quot;Ethertype-TBD&q=
uot;<br>
with a corresponding note to update that text in Sec 9 / IEEE Assignment<br=
>
Considerations. The draft should not use a specific unassigned value,<br>
even if currently available, until assigned. (it currently cites<br>
0xFEFE).=C2=A0 This section should also refer to the Metadata IDs directly,=
<br>
either by name or by registry, as if assuming that IANA has created that<br=
>
registry.<br>
<br></blockquote><div><br></div><div>Yes, this also came up in earlier revi=
ew.=C2=A0 I will upload with this fixed</div><div>as well.</div><div>=C2=A0=
</div><div>Thanks again Joe for taking the time.</div><div><br></div><div>c=
heers,</div><div>jamal</div><div><br></div><blockquote class=3D"gmail_quote=
" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
---<br>
<br>
<br>
<br>
</blockquote></div><br></div></div>

--001a113a49361a6f6205357846de--


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To: Jamal Hadi Salim <hadi@mojatatu.com>
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From: Joe Touch <touch@isi.edu>
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Subject: Re: [Tsv-art] TSV-ART review of draft-ietf-forces-interfelfb
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Hi, Jamal,

Focusing only on the portion needing continued feedback below.

Joe

On 6/17/2016 5:12 AM, Jamal Hadi Salim wrote:
> Hi Joe,
> Thanks for your review - responses below:
>
> On Wed, Jun 15, 2016 at 6:40 PM, Joe Touch <touch@isi.edu
> <mailto:touch@isi.edu>> wrote:
>
>     Hi, all,
>
>     I've reviewed this draft as part of the TSV Area Review Team, paying
>     special attention to transport-related concerns. Please take these as
>     any other IETF last call comments.
>
>     Joe
>
>     ---
>
>     The document contains two different types of transport issues: its
>     relation to supporting transport traffic and the way it exchanges
>     information between the FEs.
>
>     ...
>
>  
>
>     The document uses Ethernet as a "transport", as stated in Sec
>     3.1.1. The
>     claim that this is "simpler" than using UDP would benefit from a few
>     sentences of substantiation, especially because Ethernet does not
>     support fragmentation, which has an impact on the solutions
>     proposed in
>     Sec 5.1.1 (see below).
>
>
> The reference point is the common deployment use cases; within a single
> rack or network owned by one admin who does all the setup.
> Any suggestion on wording you'd like to see?
from:

   o  The FEs are already interconnected using Ethernet.  We focus on
      Ethernet because it is a very common setup as an FE interconnect.
      While other higher transports (such as UDP over IP) or lower
      transports could be defined to carry the data and metadata it is
      simpler to use Ethernet (for the functional scope of a single
      distributed device already interconnected with ethernet).

To:

   o  The FEs are already interconnected using Ethernet.  We focus on
      Ethernet because it is a very common setup as an FE interconnect.
      Other higher transports (such as UDP over IP) or lower
      transports could be defined to carry the data and metadata, but
      these cases are not addressed in this document.

---

--------------070301010502000002060402
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<html>
  <head>
    <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
  </head>
  <body bgcolor="#FFFFFF" text="#000000">
    Hi, Jamal,<br>
    <br>
    Focusing only on the portion needing continued feedback below.<br>
    <br>
    Joe<br>
    <br>
    <div class="moz-cite-prefix">On 6/17/2016 5:12 AM, Jamal Hadi Salim
      wrote:<br>
    </div>
    <blockquote
cite="mid:CAAFAkD_8AzGvvVEd34Fit0KT764bUxgLKSikb9WKJ2fDKiDFOw@mail.gmail.com"
      type="cite">
      <div dir="ltr">Hi Joe,
        <div>Thanks for your review - responses below:</div>
        <div class="gmail_extra"><br>
          <div class="gmail_quote">On Wed, Jun 15, 2016 at 6:40 PM, Joe
            Touch <span dir="ltr">&lt;<a moz-do-not-send="true"
                href="mailto:touch@isi.edu" target="_blank">touch@isi.edu</a>&gt;</span>
            wrote:<br>
            <blockquote class="gmail_quote" style="margin:0 0 0
              .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi, all,<br>
              <br>
              I've reviewed this draft as part of the TSV Area Review
              Team, paying<br>
              special attention to transport-related concerns. Please
              take these as<br>
              any other IETF last call comments.<br>
              <br>
              Joe<br>
              <br>
              ---<br>
              <br>
              The document contains two different types of transport
              issues: its<br>
              relation to supporting transport traffic and the way it
              exchanges<br>
              information between the FEs.<br>
              <br>
              ...</blockquote>
            <div> </div>
            <blockquote class="gmail_quote" style="margin:0 0 0
              .8ex;border-left:1px #ccc solid;padding-left:1ex">
              The document uses Ethernet as a "transport", as stated in
              Sec 3.1.1. The<br>
              claim that this is "simpler" than using UDP would benefit
              from a few<br>
              sentences of substantiation, especially because Ethernet
              does not<br>
              support fragmentation, which has an impact on the
              solutions proposed in<br>
              Sec 5.1.1 (see below).<br>
            </blockquote>
            <div><br>
            </div>
            <div>The reference point is the common deployment use cases;
              within a single</div>
            <div>rack or network owned by one admin who does all the
              setup.</div>
            <div>Any suggestion on wording you'd like to see?</div>
          </div>
        </div>
      </div>
    </blockquote>
    from:<br>
    <pre>   o  The FEs are already interconnected using Ethernet.  We focus on
      Ethernet because it is a very common setup as an FE interconnect.
      While other higher transports (such as UDP over IP) or lower
      transports could be defined to carry the data and metadata it is
      simpler to use Ethernet (for the functional scope of a single
      distributed device already interconnected with ethernet).</pre>
    To:<br>
    <pre>   o  The FEs are already interconnected using Ethernet.  We focus on
      Ethernet because it is a very common setup as an FE interconnect.
      Other higher transports (such as UDP over IP) or lower
      transports could be defined to carry the data and metadata, but
      these cases are not addressed in this document.</pre>
    ---<br>
  </body>
</html>

--------------070301010502000002060402--


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From: Jamal Hadi Salim <hadi@mojatatu.com>
Date: Sat, 18 Jun 2016 10:03:34 -0400
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Thanks Joe. I will make an update and post.

cheers,
jamal

On Fri, Jun 17, 2016 at 11:56 AM, Joe Touch <touch@isi.edu> wrote:

> Hi, Jamal,
>
> Focusing only on the portion needing continued feedback below.
>
> Joe
>
> On 6/17/2016 5:12 AM, Jamal Hadi Salim wrote:
>
> Hi Joe,
> Thanks for your review - responses below:
>
> On Wed, Jun 15, 2016 at 6:40 PM, Joe Touch <touch@isi.edu> wrote:
>
>> Hi, all,
>>
>> I've reviewed this draft as part of the TSV Area Review Team, paying
>> special attention to transport-related concerns. Please take these as
>> any other IETF last call comments.
>>
>> Joe
>>
>> ---
>>
>> The document contains two different types of transport issues: its
>> relation to supporting transport traffic and the way it exchanges
>> information between the FEs.
>>
>> ...
>
>
>
>> The document uses Ethernet as a "transport", as stated in Sec 3.1.1. The
>> claim that this is "simpler" than using UDP would benefit from a few
>> sentences of substantiation, especially because Ethernet does not
>> support fragmentation, which has an impact on the solutions proposed in
>> Sec 5.1.1 (see below).
>>
>
> The reference point is the common deployment use cases; within a single
> rack or network owned by one admin who does all the setup.
> Any suggestion on wording you'd like to see?
>
> from:
>
>    o  The FEs are already interconnected using Ethernet.  We focus on
>       Ethernet because it is a very common setup as an FE interconnect.
>       While other higher transports (such as UDP over IP) or lower
>       transports could be defined to carry the data and metadata it is
>       simpler to use Ethernet (for the functional scope of a single
>       distributed device already interconnected with ethernet).
>
> To:
>
>    o  The FEs are already interconnected using Ethernet.  We focus on
>       Ethernet because it is a very common setup as an FE interconnect.
>       Other higher transports (such as UDP over IP) or lower
>       transports could be defined to carry the data and metadata, but
>       these cases are not addressed in this document.
>
> ---
>

--001a11403cdc0b186505358df19f
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<div dir=3D"ltr">Thanks Joe. I will make an update and post.<div><br></div>=
<div>cheers,</div><div>jamal</div></div><div class=3D"gmail_extra"><br><div=
 class=3D"gmail_quote">On Fri, Jun 17, 2016 at 11:56 AM, Joe Touch <span di=
r=3D"ltr">&lt;<a href=3D"mailto:touch@isi.edu" target=3D"_blank">touch@isi.=
edu</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"mar=
gin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
 =20
   =20
 =20
  <div bgcolor=3D"#FFFFFF" text=3D"#000000">
    Hi, Jamal,<br>
    <br>
    Focusing only on the portion needing continued feedback below.<br>
    <br>
    Joe<br>
    <br>
    <div>On 6/17/2016 5:12 AM, Jamal Hadi Salim
      wrote:<br>
    </div>
    <blockquote type=3D"cite">
      <div dir=3D"ltr">Hi Joe,
        <div>Thanks for your review - responses below:</div>
        <div class=3D"gmail_extra"><br>
          <div class=3D"gmail_quote">On Wed, Jun 15, 2016 at 6:40 PM, Joe
            Touch <span dir=3D"ltr">&lt;<a href=3D"mailto:touch@isi.edu" ta=
rget=3D"_blank">touch@isi.edu</a>&gt;</span>
            wrote:<br>
            <blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;bo=
rder-left:1px #ccc solid;padding-left:1ex">Hi, all,<br>
              <br>
              I&#39;ve reviewed this draft as part of the TSV Area Review
              Team, paying<br>
              special attention to transport-related concerns. Please
              take these as<br>
              any other IETF last call comments.<br>
              <br>
              Joe<br>
              <br>
              ---<br>
              <br>
              The document contains two different types of transport
              issues: its<br>
              relation to supporting transport traffic and the way it
              exchanges<br>
              information between the FEs.<br>
              <br>
              ...</blockquote>
            <div>=C2=A0</div>
            <blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;bo=
rder-left:1px #ccc solid;padding-left:1ex">
              The document uses Ethernet as a &quot;transport&quot;, as sta=
ted in
              Sec 3.1.1. The<br>
              claim that this is &quot;simpler&quot; than using UDP would b=
enefit
              from a few<br>
              sentences of substantiation, especially because Ethernet
              does not<br>
              support fragmentation, which has an impact on the
              solutions proposed in<br>
              Sec 5.1.1 (see below).<br>
            </blockquote>
            <div><br>
            </div>
            <div>The reference point is the common deployment use cases;
              within a single</div>
            <div>rack or network owned by one admin who does all the
              setup.</div>
            <div>Any suggestion on wording you&#39;d like to see?</div>
          </div>
        </div>
      </div>
    </blockquote>
    from:<br>
    <pre>   o  The FEs are already interconnected using Ethernet.  We focus=
 on
      Ethernet because it is a very common setup as an FE interconnect.
      While other higher transports (such as UDP over IP) or lower
      transports could be defined to carry the data and metadata it is
      simpler to use Ethernet (for the functional scope of a single
      distributed device already interconnected with ethernet).</pre>
    To:<br>
    <pre>   o  The FEs are already interconnected using Ethernet.  We focus=
 on
      Ethernet because it is a very common setup as an FE interconnect.
      Other higher transports (such as UDP over IP) or lower
      transports could be defined to carry the data and metadata, but
      these cases are not addressed in this document.</pre>
    ---<br>
  </div>

</blockquote></div><br></div>

--001a11403cdc0b186505358df19f--


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To: Brian Trammell <ietf@trammell.ch>, ietf <ietf@ietf.org>
References: <E75E6B47-C915-4302-B950-4502AFB1F640@trammell.ch>
From: Tim Wicinski <tjw.ietf@gmail.com>
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Cc: tsv-art@ietf.org, draft-ietf-dnsop-dnssec-roadblock-avoidance@tools.ietf.org
Subject: Re: [Tsv-art] TSV-ART review of draft-ietf-dnsop-dnssec-roadblock-avoidance
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Brian

While I attempt to corral the authors, let me attempt to answer these 
questions as the Document Shepherd.

Answers inline.

On 6/14/16 8:13 AM, Brian Trammell wrote:
> Greetings,
>
> I've reviewed this draft as part of the TSV Area Review Team, paying special attention to transport-related concerns. Please take these as any other IETF last call comments.
>
> Summary: This draft clearly describes online testing of possible DNSSEC failures, and how to interpret the results. It does not appear to pose any transport-related danger, and is broadly ready for publication as a BCP.
>
> I do have the following questions, though:
>
> (1) Section 3.1: "The tests are designed to check for one feature at a time". This is generally A Good Thing, but it does seem that there should be some attempt to economize on packets sent. This is not as much a problem when testing recursive resolvers, since they should only need to be run when a host introduces itself to a neighboring recursive resolver and the test traffic shouldn't leave the site. However, section 3.2 are designed to run on the open Internet, and seems to suggests that tests 3.2.1-3.2.3 should be run *first*, then followed by the fourteen tests in section 3.1. In the "best case" future for this document, that every stub resolver implements this online testing automatically, every packet saved is significant.
>
Interesting point, but the tests in 3.1 would never be run against the 
servers in section 3.2.  I agree, if they did, your optimization would 
be useful.  I am looking for the text which may imply running section 
3.1 tests first before running section 3.2 texts

> Some optimizations are obvious: 3.2.1 replaces 3.1.1, 3.2.3 replaces 3.1.2. The document should note these (even though they're trivial). Some optimizations have already been made: 3.1.5, 3.1.10, 3.3. test multiple conditions. Are there any other tests that could be combined (e.g. the TCP connectivity and EDNS0 tests) without losing fidelity?
>
> (2) Could the retries advised in section 5 be abused to cause a resolver running roadblock avoidance to send unnecessary test traffic? It seems that injecting an error, illegal, or bogus response could induce multiple retries, though it's not clear that the amplification factor makes this worth it.
>
I think the answer on unnecessary traffic is yes, but the text in the 
document suggests retries the Validator MAY run.  The text could be 
improved to suggest avoid creating amplification issues, however 
insignificant.

> (2) In section 6, the draft raises the possibility of unstable networking after connection (e.g. in a captive portal situation); guidance to refrain from flooding the network with test traffic during this instability might be useful. Perhaps explicitly link the DNSSEC checks to a "network proves to be usable" signal (either from the application or the operating system)?
>
I believe in Section 6 the two options is a trade off between security 
(keep testing, and falling test) and usability (waiting for network). 
Does;'t the text in 6.1 express this - "the device MAY have a policy of 
action, like continue or fail. "

thanks
tim

> Thanks, cheers,
>
> Brian (as TSV-ART reviewer)
>


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Subject: [Tsv-art] TSV Chairs/ART dinner at IETF 96
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--94eb2c0bd86af037b1053657b230
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Dear TSV Chairs and Area Review Team members,

Please reserve Monday evening, July 18, at 20:30 for our usual dinner and
conversation.

Please let us know if you are coming, using the Doodle poll at
http://doodle.com/poll/aqt844tz9zwsctcf, by July 16. You can also let us
know about any dietary restrictions in a comment there.

Actual coordinates will be announced when we have a headcount.

Thanks, and we're looking forward to seeing you in Berlin!

Spencer and Mirja

--94eb2c0bd86af037b1053657b230
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<div dir=3D"ltr">Dear TSV Chairs and Area Review Team members,<div><br></di=
v><div>Please reserve Monday evening, July 18, at 20:30 for our usual dinne=
r and conversation.</div><div><br></div><div>Please let us know if you are =
coming, using the Doodle poll at=C2=A0<a href=3D"http://doodle.com/poll/aqt=
844tz9zwsctcf">http://doodle.com/poll/aqt844tz9zwsctcf</a>, by July 16. You=
 can also let us know about any dietary restrictions in a comment there.</d=
iv><div><br></div><div>Actual coordinates will be announced when we have a =
headcount.</div><div><br></div><div>Thanks, and we&#39;re looking forward t=
o seeing you in Berlin!</div><div><br></div><div>Spencer and Mirja</div></d=
iv>

--94eb2c0bd86af037b1053657b230--

