Re: [Gen-art] Review of draft-ietf-6man-rfc1981bis-04

Fred Baker <fredbaker.ietf@gmail.com> Tue, 14 February 2017 18:54 UTC

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Subject: Re: [Gen-art] Review of draft-ietf-6man-rfc1981bis-04
From: Fred Baker <fredbaker.ietf@gmail.com>
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Date: Tue, 14 Feb 2017 10:54:25 -0800
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To: Ole Troan <otroan@employees.org>
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Cc: Stewart Bryant <stewart.bryant@gmail.com>, "gen-art@ietf.org" <gen-art@ietf.org>, 6man WG <ipv6@ietf.org>, "ietf@ietf.org" <ietf@ietf.org>, "draft-ietf-6man-rfc1981bis.all@ietf.org" <draft-ietf-6man-rfc1981bis.all@ietf.org>
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> On Feb 14, 2017, at 10:33 AM, otroan@employees.org wrote:
> 
>> *If*  you care about packet loss, then your only option is to probe the path with with
>> synthetic data that exactly mimics the live data, or not to probe at all and live
>> with the 1280. As I said 1280 is pretty close to 1496 which is all most networks
>> will give you in practice.
> 
> Yes, but sending at 1280 does not work for IP tunnels. The whole purpose of the minimum MTU was to give space for tunnel headers (1500-1280).

I'm confused by that statement. https://tools.ietf.org/html/rfc7676#section-3.2 indicates that a GRE tunnel on IPv6 and carrying an IPv6 payload works with a PMTU of 1280, and AFAIK it is among the larger tunnel headers. What tunnels does a PMTU of 1280 not work for?