Re: Last Call: <draft-ietf-6man-rfc1981bis-04.txt> (Path MTU Discovery for IP version 6) to Internet Standard

otroan@employees.org Tue, 07 February 2017 20:32 UTC

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Subject: Re: Last Call: <draft-ietf-6man-rfc1981bis-04.txt> (Path MTU Discovery for IP version 6) to Internet Standard
Date: Tue, 7 Feb 2017 21:32:33 +0100
In-Reply-To: <a479d81e-42f9-0695-f31a-c494c02de9af@isi.edu>
To: Joe Touch <touch@isi.edu>
References: <148599312602.18643.4886733052828400859.idtracker@ietfa.amsl.com> <1859B1D9-9E42-4D65-98A8-7A326EDDE560@netapp.com> <f8291774-409e-2948-3b29-83dbb09d39d9@si6networks.com> <63eaf82e-b6d5-bff5-4d48-479e80ed4698@gmail.com> <2d36e28c-ee7d-20fc-3fec-54561e520691@si6networks.com> <C0A114C1-5E4A-4B8E-A408-55AF1E30873F@netapp.com> <3A5429F6-0EA6-436A-AF30-E55C9026F456@employees.org> <8cf1fe7d-bdfd-5e81-e61f-55d9ecd5d28a@isi.edu> <7E9AB9E8-3FCB-4475-BEEB-F18CFC4BC752@employees.org> <8076a1ea-182d-9cbe-f954-3e50f0fc53d9@isi.edu> <E11F9A4D-DE9E-4BFD-8D0D-252842719FC5@employees.org> <a479d81e-42f9-0695-f31a-c494c02de9af@isi.edu>
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Joe,

Thanks!

> I appreciate that you want to not point at PLPMTUD because it's not
> widely supported, but **for the same reason** this doc should not hold
> up this solution without pointing out very clearly that it basically
> isn't going to be work.

Would something like this help?
(borrowed from https://en.wikipedia.org/wiki/Path_MTU_Discovery)

"Many network security devices block all ICMP messages for perceived
 security benefits, including the errors that are necessary for the proper
 operation of PMTUD. This can result in connections that complete the
 TCP three-way handshake correctly, but then hang when data is transferred.
 This state is referred to as a black hole connection."


Best regards,
Ole