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Re: Last Call: <draft-ietf-6man-oversized-header-chain-08.txt> (Implications of Oversized IPv6 Header Chains) to Proposed Standard

Brian E Carpenter <brian.e.carpenter@gmail.com> Mon, 14 October 2013 19:34 UTC

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Message-ID: <525C473D.4080403@gmail.com>
Date: Tue, 15 Oct 2013 08:34:21 +1300
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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To: "Templin, Fred L" <Fred.L.Templin@boeing.com>
Subject: Re: Last Call: <draft-ietf-6man-oversized-header-chain-08.txt> (Implications of Oversized IPv6 Header Chains) to Proposed Standard
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Cc: Fernando Gont <fgont@si6networks.com>, 6man Mailing List <ipv6@ietf.org>, "ietf@ietf.org" <ietf@ietf.org>, Ray Hunter <v6ops@globis.net>
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Fred,

On 15/10/2013 06:38, Templin, Fred L wrote:
...
>> We could have that discussion in 6man, sure, but I don't believe that
>> it's
>> relevant to the question of whether draft-ietf-6man-oversized-header-
>> chain
>> is ready.
> 
> If it messes up tunnels, then it's not ready.

That doesn't follow. See below.

>> This draft mitigates a known problem in terms of the current
>> IPv6 standards.
> 
> If that problem is also mitigated by a measure that does not mess
> up tunnels, then wouldn't that be worth considering before
> finalizing this publication.

The draft mitigates a known problem with communication paths that
do not include nested tunnels requiring nested fragmentation,
where the nested tunnel has to deal with an MTU <1280 *and* where
the nested tunnel goes through a firewall that wants to analyse
the complete header chain of the innermost packet.

No, I don't think it's worth considering that case before specifying
this mitigation.

     Brian

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