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Re: Mirja Kühlewind's Discuss on draft-ietf-6man-rfc2460bis-09: (with DISCUSS and COMMENT)

Bob Hinden <bob.hinden@gmail.com> Thu, 20 April 2017 15:47 UTC

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From: Bob Hinden <bob.hinden@gmail.com>
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Subject: Re: Mirja Kühlewind's Discuss on draft-ietf-6man-rfc2460bis-09: (with DISCUSS and COMMENT)
Date: Thu, 20 Apr 2017 08:47:08 -0700
In-Reply-To: <8d127de1-a1b6-8406-c234-192fcbf01ad4@si6networks.com>
Cc: Bob Hinden <bob.hinden@gmail.com>, Ole Trøan <otroan@employees.org>, "Mirja Kuehlewind (IETF)" <ietf@kuehlewind.net>, draft-ietf-6man-rfc2460bis@ietf.org, IPv6 List <ipv6@ietf.org>, Suresh Krishnan <suresh.krishnan@gmail.com>, IESG <iesg@ietf.org>, 6man-chairs@ietf.org
To: Fernando Gont <fgont@si6networks.com>
References: <149201127005.15808.3277140025315157500.idtracker@ietfa.amsl.com> <248F8BA5-48D6-4933-B45F-7F1B20477C2C@employees.org> <3C06A5F9-19B9-48E1-BB67-57D540E5E38D@kuehlewind.net> <A5628A89-3830-4851-87F1-AE8329597DAE@gmail.com> <58B249A0-2F0B-4AD6-890D-BB0F0594DEE1@kuehlewind.net> <0c7d3a7b-99c9-dbef-d6cc-9a4a94cb9c9f@gmail.com> <4AE56E75-78D4-43EA-8118-8195FD8A3D08@kuehlewind.net> <4fc2ef36-cd17-58f1-8089-a5645f08ad45@gmail.com> <D7EE44C3-04DB-4CFD-836F-2BFA74A35268@employees.org> <90DFC565-B4E7-45E2-BE6A-0B67895E87F8@gmail.com> <CA+MHpBr7aeuyd8h5n6U6Q4jD_gtLCKsPJUgQqQuhgkEE3DGwqg@mail.gmail.com> <D41A10C3-74D4-45EE-8161-C344CB30329A@kuehlewind.net> <5E28EF66-7BE1-4F11-88F3-6D928870A9FE@kuehlewind.net> <616cb74d-cc15-6c26-cb1d-612dfcddd353@gmail.com> <99E119A3-4BEA-4EE4-9DC1-7B434CAAE016@kuehlewind.net> <8EF4BCDA-ADB9-4EF4-A873-95CA67C6D7F3@employees.org> <8d127de1-a1b6-8406-c234-192fcbf01ad4@si6networks.com>
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Fernando,

> On Apr 20, 2017, at 6:01 AM, Fernando Gont <fgont@si6networks.com> wrote:
> 
>> ….
>> 
>> Dropping unknown extension headers in transit networks is relatively
>> rare. With the HBH being an exception, with almost a 40% drop. (Note
>> that there are no HBH option that would make a lot of sense across
>> the Internet, so again chicken and egg.)
> 
> Based on RFC7872 ("Observations on the Dropping of Packets with IPv6
> Extension Headers in the Real World"), your statement is incorrect.
> 
> Transit routers do filter packets with EHs, whether known or unknown.

I think this confirms that the current text which recommends against defining new EH is correct.

Thanks,
Bob

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