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Re: New Version Notification for draft-bonica-6man-frag-deprecate-00.txt

George Michaelson <ggm@algebras.org> Tue, 25 June 2013 05:06 UTC

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Date: Tue, 25 Jun 2013 15:06:53 +1000
Message-ID: <CAKr6gn1cnGfktfKraQegHNP_kjHyzNKGzw3ZDe1cZ__Czsu_kw@mail.gmail.com>
Subject: Re: New Version Notification for draft-bonica-6man-frag-deprecate-00.txt
From: George Michaelson <ggm@algebras.org>
To: "ipv6@ietf.org 6man-wg" <ipv6@ietf.org>
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One thing I *strongly* agree with: the sentence at 2.2:

                  The effective MTU for IPv6 is 1280 bytes.

This is looking compellingly awful, but true to me. I think there is enough
pMTU breakage that its safer to MSS clamp down. The downside cost in
apparent efficiency has been beaten to death, its a non-issue for me right
now. We even see broken tunnel heads which report back with pMTU the size
of the *outer* packet shroud, so tell 1400 byte packets to resend at ...
1400 bytes. FAIL.

cheers

-George

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