Subject: Re: [MOBILE-IP] Draft for Vendor/Organization Specific Extensions

From: Weijun Jiang <[email-masked]>
Date: Wed, 29 Sep 1999 13:47:03 -0700

Hi,

For my curiosity, can you tell me why the length field in the Critical
Vendor/Organization Specific Extension  
is 2 bytes long, and the length field in Normal Vendor/Organization
Specific Extension is 1 byte long?

br,

weijun

>
> Mobile IP Working Group                                    Gopal
Dommety
> INTERNET DRAFT                                             Kent Leung
> August 1999                                                Cisco
Systems
>
>
>             Vendor/Organization-Specific Extensions for Mobile IP
>                   <draft-dommety-mobileip-vendor-ext-00.txt>
>
>
> Status of this Memo
>
>    This document is an Internet Draft and is in full conformance with
>>    all provisions of Section 10 of RFC2026. Internet Drafts are
>>    working documents of the Internet Engineering Task Force (IETF),
its
>>    areas, and working groups. Note that other groups may also
distribute
>>    working documents as Internet Drafts.
>>
>>    Internet Drafts are draft documents valid for a maximum of six
months
>>    and may be updated, replaced, or obsoleted by other documents at
any
>>    time. It is inappropriate to use Internet Drafts as reference
>>    material or to cite them other than as "work in progress."
>>
>>    The list of current Internet-Drafts can be accessed at
>>    http://www.ietf.org/ietf/1id-abstracts.txt.
>>
>>    The list of Internet-Draft Shadow Directories can be accessed at
>>    http://www.ietf.org/shadow.html.
>>
>> Abstract
>>
>>    This draft proposes an extensions that can be used as a vendor
>>    or organization-Specific Extensions.  These extensions will
facilitate
>>    organizations to make specific extensions as they see fit for
research
>>    or deployment purposes.
>>
>> 1.0   Introduction
>>
>>    Current specification of Mobile IP [1] does not allow for
>>    organizations and vendor to include organization/vendor-specific
>>    extensions in the Mobile IP messages. With the wide scale
deployment
>>    of Mobile IP it is useful to have a vendor or
organization-Specific
>>    Extension.  This draft proposes  extensions that can be used for
>>    making organization specific extensions.
>>
>>
>> 2.0 Vendor/Organization Specific Extensions
>>
>> Two  Vendor/Organization Specific Extensions  are described,
Critical
>> and Normal    Vendor/Organization  Specific Extensions.     The
basic
>> differeces are between the Critical and  the Normal Extensions is
that
>> whan the  Critical extension  is encountered  but not  recognized,
the
>> message   containing the   extension    MUST  be   silently
>> discarded.  Whereas   when   a  Normal   Vendor/Organization
Specific
>> Extension is encountered and not recognized, the extension is
ignored,
>> but  the  rest  of  the Extensions  and   message data  MUST still
be
>> processed. Another    difference between the    two is  that
Critical
>> Vendor/Organization Extension has a lenght feild of two bytes.
>>
>>
>> 2.1 Critical Vendor/Organization Specific Extension
>>
>>    The format of this extension is as shown below.
>>
>>        0                   1                   2                   3
>>        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0
1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>       |     Type      |            Length             |   Vendor-ID
>>
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>                      Vendor-ID (cont)                 | Opaque
Data...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>
>>
>>                 Figure 1: Vendor/Organization Specific Extension
>>
>>
>>       Type       TBD-1 (value should be in the range of 0-127)
>>
>>       Length     Length in bytes of this extension, not including the
Type
>>                  and Length bytes.
>>
>>       Vendor-ID
>>                  The high-order octet is 0 and the low-order 3 octets
are the
>>                  SMI Network Management Private Enterprise Code of
the Vendor
>>                  in network byte order, as defined in the Assigned
Numbers
>>                  RFC [2].
>>
>>       Opaque Data
>>                  Vendor/organization specific data.  These data
fields
>>                  may be publicized in future RFCs.
>>
>> 2.2 Normal Vendor/Organization Specific Extension
>>
>>    The format of this extension is as shown below.
>>
>>        0                   1                   2                   3
>>        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0
1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>       |     Type      |    Length     |   Vendor-ID
>>
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>                  Vendor-ID (cont)     | Opaque Data...                
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>
>>
>>                 Figure 1: Vendor/Organization Specific Extension
>>
>>
>>       Type       TBD-2 (value should be in the range of 128-255)
>>
>>       Length     Length in bytes of this extension, not including the
Type
>>                  and Length bytes.
>>
>>       Vendor-ID
>>
>>                  The high-order octet is  0 and the low-order 3
octets
>>                are the SMI Network Management Private Enterprise
>>                Code of         the Vendor in network byte order, as
>>                defined in the Assigned Numbers RFC [2].
>>
>>       Opaque Data
>>                  Vendor/organization specific data.  These data
fields
>>                  may be publicized in future RFCs.
>>
>>
>> 3.0 Restrictions
>>
>>    Multiple TLV's with the TBD-1 and TBD-2 types can  be included in
a
>> message. TLVs with TBD-1 and TBD-2 types can  be placed anywhere
after
>> the fixed  portion of the Mobile IP  meggase.  These TLVs are
expected
>> to  be protected by   the  corresponding authenticator as
necessary.
>> Ordering of these TLV's should not be modified by intermediate nodes.
>>
>>
>>
>> 4.0 Security Considerations
>>
>>    This document assumes that the Mobile IP messages are
authenticated
>> using a method defined by the Mobile IP protocol.  This proposal does
>> not impose any additional requirements on Mobile IP messages from a
>> security point of view. So this is not expected to be a security
>> issue.
>>
>>
>> 5.0 IPv6 considerations
>>
>>       This extension can be used in IPv4 and IPv6 alike.
>>
>> References
>
>    [1] C. Perkins, Editor.  IP Mobility Support.  RFC 2002, October
>        1996.
>    [2] Reynolds, J., and J. Postel, "Assigned Numbers", STD 2, RFC
>        1700, USC/Information Sciences Institute, October 1994.
>
> Authors' Addresses
>

---

From: Gopal Dommety <[email-masked]>
Date: Wed, 29 Sep 1999 21:55:08 -0700

> Vendor/Organization Specific Extension =20

Hi Weijun,

Ideally, it would have been good to have both as two byte length. For
the Normal type if a HA does not understand it, it will have to skip
it according to RFC2002. In thi case the legth is assumed to be of
one byte. So, having a two byte lenght could create interoperability
problems. But for the Critical type, if the HA does not understand it
if discards it. If it does undertand it, HA will know how to process
it.

Hope this is helps.

thanks
Gopal

> >>       Length     Length in bytes of this extension, not including the=
>
> Type
> >>                  and Length bytes.
> >>
> >>       Vendor-ID
> >>                  The high-order octet is 0 and the low-order 3 octets=
>
> are the
> >>                  Vendor-ID (cont)     | Opaque Data...               =
> =20
> |
> >>
> >>       Length     Length in bytes of this extension, not including the=
>
> Type
> >>                  and Length bytes.
> >>
> >>       Vendor-ID
> >>
> >> Ordering of these TLV's should not be modified by intermediate nodes.=
>
> >>
> >>
> >>
> >> using a method defined by the Mobile IP protocol.  This proposal does=
>
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