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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, 02 February 2017 09:38 UTC

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From: "Eggert, Lars" <lars@netapp.com>
To: "ietf@ietf.org" <ietf@ietf.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, 02 Feb 2017 09:37:16 +0000
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Cc: "tsv-area@ietf.org" <tsv-area@ietf.org>, "otroan@employees.org" <otroan@employees.org>, "draft-ietf-6man-rfc1981bis@ietf.org" <draft-ietf-6man-rfc1981bis@ietf.org>, "ipv6@ietf.org" <ipv6@ietf.org>, "6man-chairs@ietf.org" <6man-chairs@ietf.org>
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Hi,

the last paragraph of the introduction reads:

   An extension to Path MTU Discovery defined in this document can be
   found in [RFC4821].  It defines a method for Packetization Layer Path
   MTU Discovery (PLPMTUD) designed for use over paths where delivery of
   ICMP messages to a host is not assured.

Given that ICMP delivery cannot be assured over the vast majority of paths in the current Internet, should this document make a recommendation to implement RFC4821?

Also, even if ICMP delivery is assured, there are additional complications for UDP, which has been seeing a lot of interest both as a tunneling encapsulation and for applications (e.g., QUIC). Many platforms do not provide UDP-sending applications any information about arriving ICMP messages that were triggered by their transmissions. So even if the path delivers ICMP, the OS makes ICMP-based PMTUD for UDP often impossible. Another reason to recommend 4821?

Lars

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