[tram] The way forward for draft-ietf-tram-stun-pmtud

Magnus Westerlund <magnus.westerlund@ericsson.com> Fri, 20 March 2020 10:19 UTC

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From: Magnus Westerlund <magnus.westerlund@ericsson.com>
To: "draft-ietf-tram-stun-pmtud@ietf.org" <draft-ietf-tram-stun-pmtud@ietf.org>, "tram@ietf.org" <tram@ietf.org>
Thread-Topic: The way forward for draft-ietf-tram-stun-pmtud
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Date: Fri, 20 Mar 2020 10:19:46 +0000
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Subject: [tram] The way forward for draft-ietf-tram-stun-pmtud
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TRAM WG,

draft-ietf-tram-stun-pmtud (
https://datatracker.ietf.org/doc/draft-ietf-tram-stun-pmtud/) has take a lot of
time in trying to resolve the IESG comments from the IESG evaluation that
occurred in September 2018. 

Due to the slow progress I took over the document from Spencer Dawkins as
responsible AD and I did my own AD evaluation of it when there was progress in
December. One aspect I wasn't particular happy with was it loose relationship to
any specification on how one uses the defined probing to actually determine the
working path MTU. In the meantime TSVWG has also made progress on its
specification for how to perform PATH MTU discovery for datagram pacektization
layers (https://datatracker.ietf.org/doc/draft-ietf-tsvwg-datagram-plpmtud/).This document is ready for IESG evaluation. 

After discussion with the authors I strongly believe the right way forward for
the STUN PMTUD document is to define itself as a packetization layer using the
TSVWG defined algorithm. On the high level this appears fairly straight forward
and primarily requires clarification on how the drafts current mechanism are
used for probing, and detection of black holes, etc. Due to the nature of this
method of performing probing the requirements and interaction with the
application UDP protocol may need a bit further clarification. I also thing the
WG need to consider if all the different implementation options should remain or
some simplification is need. 

Due to the changes in the document the above will result in I will send the
document back to the WG. I don't see this as resulting in any significant
additional steps as there would still be need for determining WG and IETF
consensus to these changes prior to a new IESG evaluation that anyway would be
needed due to the turn over of IESG members.
 
Cheers

Magnus Westerlund 
TSV AD