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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>
In-Reply-To: <57307617-C87C-4430-B92A-59E28C6779CD@employees.org>
Date: Tue, 14 Feb 2017 10:54:25 -0800
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References: <148665359396.20513.9749548375095869760.idtracker@ietfa.amsl.com> <2997d33f-3884-7831-50ed-1713c93b3867@gmail.com> <b9dfd941-0eba-c257-fef4-2f5e6bbd82a8@gmail.com> <078b28a9a26540da9e4caaba4c436cd3@XCH15-06-08.nw.nos.boeing.com> <440c60d3-0687-c7f1-f8b6-19620e6f618a@gmail.com> <6cb665e0a2244dae93e1b5b91bd9495a@XCH15-06-08.nw.nos.boeing.com> <fce8c0ef-25b7-9ba7-a5bf-9b5d7f2b19fc@gmail.com> <f4f81574e09e45169438d39afeb83369@XCH15-06-08.nw.nos.boeing.com> <1fb9a3ad-19e5-0b35-d15a-e74fed88bb8b@gmail.com> <57307617-C87C-4430-B92A-59E28C6779CD@employees.org>
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?

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