Re: [tsvwg] I-D Action: draft-ietf-tsvwg-datagram-plpmtud-14.txt

Tom Jones <tom@erg.abdn.ac.uk> Wed, 12 February 2020 10:09 UTC

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Date: Wed, 12 Feb 2020 10:08:57 +0000
From: Tom Jones <tom@erg.abdn.ac.uk>
To: wes@mti-systems.com, tsvwg@ietf.org
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Subject: Re: [tsvwg] I-D Action: draft-ietf-tsvwg-datagram-plpmtud-14.txt
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On Wed, Feb 12, 2020 at 02:06:23AM -0800, internet-drafts@ietf.org wrote:
> 
> A New Internet-Draft is available from the on-line Internet-Drafts directories.
> This draft is a work item of the Transport Area Working Group WG of the IETF.
> 
>         Title           : Packetization Layer Path MTU Discovery for Datagram Transports
>         Authors         : Godred Fairhurst
>                           Tom Jones
>                           Michael Tuexen
>                           Irene Ruengeler
>                           Timo Voelker
> 	Filename        : draft-ietf-tsvwg-datagram-plpmtud-14.txt
> 	Pages           : 44
> 	Date            : 2020-02-12
> 
> Abstract:
>    This document describes a robust method for Path MTU Discovery
>    (PMTUD) for datagram Packetization Layers (PLs).  It describes an
>    extension to RFC 1191 and RFC 8201, which specifies ICMP-based Path
>    MTU Discovery for IPv4 and IPv6.  The method allows a PL, or a
>    datagram application that uses a PL, to discover whether a network
>    path can support the current size of datagram.  This can be used to
>    detect and reduce the message size when a sender encounters a packet
>    black hole (where packets are discarded).  The method can probe a
>    network path with progressively larger packets to discover whether
>    the maximum packet size can be increased.  This allows a sender to
>    determine an appropriate packet size, providing functionality for
>    datagram transports that is equivalent to the Packetization Layer
>    PMTUD specification for TCP, specified in RFC 4821.
> 
>    The document updates RFC 4821 to specify the method for datagram PLs,
>    and updates RFC 8085 as the method to use in place of RFC 4821 with
>    UDP datagrams.  Section 7.3 of RFC4960 recommends an endpoint apply
>    the techniques in RFC4821 on a per-destination-address basis.
>    RFC4960 is updated to recommend that SCTP uses the method specified
>    in this document instead of the method in RFC4821.
> 
>    The document also provides implementation notes for incorporating
>    Datagram PMTUD into IETF datagram transports or applications that use
>    datagram transports.
> 
>    When published, this specification updates RFC 4821 and RFC 8085.
> 
> 

Hi Wes,

We have posted a new version of the draft that resolves all the working
group last call comments we have received. The authors are in agreement
that this document resolves all the issues we are aware of.

- Tom