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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 17:43 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: Warren Kumari <warren@kumari.net>, Toerless Eckert <tte@cs.fau.de>
Cc: "6man@ietf.org" <6man@ietf.org>
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From: Fernando Gont <fgont@si6networks.com>
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Date: Mon, 13 Jul 2020 14:43:25 -0300
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On 10/7/20 17:13, Warren Kumari wrote:
> 
> 
> On Fri, Jul 10, 2020 at 2:32 PM Toerless Eckert <tte@cs.fau.de 
> <mailto:tte@cs.fau.de>> 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.
> 
> 
> Ah, that is my cue: 
> https://www.ietf.org/archive/id/draft-taylor-v6ops-fragdrop-02.txt (expired 
> in 2013) and 
> https://tools.ietf.org/html/draft-gont-v6ops-ipv6-ehs-packet-drops-03 (expired 
> in 2016).

Curiously enough, draft-gont-v6ops-ipv6-ehs-packet-drops was kind of 
shot down at the time since it was seen as an invitation for operators 
to drop packets that contain EHs (!) -- which honestly feels a bit like 
shooting the messenger.



> I'm sure that this is once again going to devolve into the standard "But 
> you shouldn't!!!! It kills puppies" vs "I have a network to run; I'm not 
> just going to let anything in" vs "Here is some real world data" thread.

Just a humble minor correction ;-) : I think there's only two real "vs": 
the real world data is essentially in the same camp as "I have a network 
to run", since measurements essentially measure what folks that run 
networks do, as opposed to what folks that publish specs say.

draft-gont-v6ops-ipv6-ehs-packet-drops essentially tried to analyze why 
the numbers in RFC7872 were what they were. Curiously enough, at the 
time when RFC7872 was adopted and published we were requested to strip 
any sort of rationale for the packet drops from RFC7872, which I guess 
helped the idea of some that folks dropping these packets are just 
irrational.

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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