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

otroan@employees.org Tue, 14 February 2017 19:16 UTC

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Subject: Re: [Gen-art] Review of draft-ietf-6man-rfc1981bis-04
Date: Tue, 14 Feb 2017 20:16:56 +0100
In-Reply-To: <097680c30ae64d74b0c30ffcaeb4c112@XCH15-06-08.nw.nos.boeing.com>
To: "Templin, Fred L" <Fred.L.Templin@boeing.com>
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> <097680c30ae64d74b0c30ffcaeb4c112@XCH15-06-08.nw.nos.boeing.com>
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Cc: 6man WG <ipv6@ietf.org>, "ietf@ietf.org" <ietf@ietf.org>, "gen-art@ietf.org" <gen-art@ietf.org>, Stewart Bryant <stewart.bryant@gmail.com>, "draft-ietf-6man-rfc1981bis.all@ietf.org" <draft-ietf-6man-rfc1981bis.all@ietf.org>
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Fred,

>> 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).
> 
> But, if non-tunnel links set a 1280 MTU which is perfectly OK with the standard then
> there is no space for headers. Given the issues with classical PMTUD then (plus the
> non-applicability of RFC4821 for tunnels) the only solution for tunnels is fragmentation.
> I'll let Joe step in if he wants to.

You are correct. "Does not work for IP tunnels without fragmenting the outer header" is what I should have written.
Of course it appears IPv6 fragments have a order of magnitude higher drop probability than ICMP PMTUD messages.

Pick your poison.

Best regards,
Ole

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