Re: [IETF] Re: Last Call: <draft-ietf-intarea-ipv4-id-update-05.txt> (Updated Specification of the IPv4 ID Field) to Proposed Standard

Joe Touch <touch@isi.edu> Wed, 06 June 2012 00:51 UTC

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Date: Tue, 05 Jun 2012 17:50:41 -0700
From: Joe Touch <touch@isi.edu>
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To: Warren Kumari <warren@kumari.net>
Subject: Re: [IETF] Re: Last Call: <draft-ietf-intarea-ipv4-id-update-05.txt> (Updated Specification of the IPv4 ID Field) to Proposed Standard
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Kuari wrote:
> On Jun 3, 2012, at 12:34 AM, C. M. Heard wrote:
>> On Sat, 2 Jun 2012, Masataka Ohta wrote:
>>> Existing routers, which was relying on ID uniqueness of atomic
>>> packets, are now broken when they fragment the atomic packets.
 >>
>> Such routers were always broken.  An atomic packet has DF=0 and any
>> router fragmenting such a packet was and is non-compliant with
>> the relevant specifications (RFCs 791, 1122, 1812).
 >
> Sorry, but no….
>
> Not following the RFC != broken. Not following the RFC == non-compliant.
>
> There are numerous places where implementations do not follow the
> specs for various reasons, ranging from simply not bothering, through
> philosophical differences to customers paying for non-compliant feature X.

Vendors that "choose to ignore" (IMO, that's "violates") the specs 
rarely make clear their rationale or the consequences to users.

Regardless, as has been noted, the routers were already non-compliant 
when they ignored the flags of an atomic datagram.

Joe