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

"Eggert, Lars" <lars@netapp.com> Thu, 09 February 2017 08:22 UTC

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From: "Eggert, Lars" <lars@netapp.com>
To: "otroan@employees.org" <otroan@employees.org>
Subject: Re: Last Call: <draft-ietf-6man-rfc1981bis-04.txt> (Path MTU Discovery for IP version 6) to Internet Standard
Thread-Topic: Last Call: <draft-ietf-6man-rfc1981bis-04.txt> (Path MTU Discovery for IP version 6) to Internet Standard
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Date: Thu, 09 Feb 2017 08:21:48 +0000
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On 2017-2-9, at 8:39, otroan@employees.org wrote:
> 
> "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. This is one significant
> example of how PMTUD is broken on the Internet."

Like it.

Might be worthwhile to point at PLPMTUD as something that works, if the app/service meets its requirements.

Lars

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