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Re: Death by extension header (was:RE: New Version Notification for draft-li-6man-hbh-fwd-hdr-00.txt)

Fernando Gont <fgont@si6networks.com> Mon, 13 July 2020 20:18 UTC

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Subject: Re: Death by extension header (was:RE: New Version Notification for draft-li-6man-hbh-fwd-hdr-00.txt)
To: Toerless Eckert <tte@cs.fau.de>, Fernando Gont <fernando@gont.com.ar>
Cc: "6man@ietf.org" <6man@ietf.org>
References: <DM6PR05MB6348708352E1EE4421A61D63AE650@DM6PR05MB6348.namprd05.prod.outlook.com> <CALx6S34e21BLHRfx+p7agrzzDsx-M-XxB6cZQnWc-d0wqSesRQ@mail.gmail.com> <20200710183228.GV42197@faui48f.informatik.uni-erlangen.de> <6fc66168-f04c-c23e-856c-5a61e1a28f5f@gont.com.ar> <20200713200141.GF38490@faui48f.informatik.uni-erlangen.de>
From: Fernando Gont <fgont@si6networks.com>
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Date: Mon, 13 Jul 2020 17:17:54 -0300
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On 13/7/20 17:01, Toerless Eckert wrote:
> On Mon, Jul 13, 2020 at 03:00:44PM -0300, Fernando Gont wrote:
>> On 10/7/20 15:32, Toerless Eckert wrote:
>>> IMHO: See my email earlier in the thread about punting stuff to slow-path, especially when/before
>>> you figure out that you should have just ignored something at linerarte.
>>>
>>> Aka: not sufficiently prescriptive RFCs + bad implementations == extension header based features killed in deployments.
>>
>> Indeed. And add to that that the EH structure itself seems to be rather
>> unfriendly with some popular hardware architectures. (unless with "not
>> sufficiently prescriptive RFCs" you are meaning to set the maximum EH-header
>> chain length to some sane value that folks might agree to comply with).
> 
> I think we might want to start with a draft collecting what we think to
> kow about the problem and figure out if we can structure it accordingl
> to make sense out of it to make progress that is not just incrementally fixing
> one single bit.

We already did that: 
https://tools.ietf.org/html/draft-gont-v6ops-ipv6-ehs-packet-drops

Thanks,
-- 
Fernando Gont
SI6 Networks
e-mail: fgont@si6networks.com
PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492

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