Re: [tsvwg] New Version Notification for draft-daiya-tsvwg-udp-options-protocol-number-00.txt

"C. M. Heard" <heard@pobox.com> Wed, 12 July 2023 17:51 UTC

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From: "C. M. Heard" <heard@pobox.com>
Date: Wed, 12 Jul 2023 10:50:48 -0700
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To: Daiya Yuyama <daiya@sfc.wide.ad.jp>, Gorry Fairhurst <gorry@erg.abdn.ac.uk>
Cc: Hirochika Asai <panda@wide.ad.jp>, TSVWG <tsvwg@ietf.org>
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Subject: Re: [tsvwg] New Version Notification for draft-daiya-tsvwg-udp-options-protocol-number-00.txt
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On Wed, Jul 12, 2023 at 8:42 AM Gorry Fairhurst wrote:
> On 11/07/2023 18:47, Daiya Yuyama wrote:
> > We have submitted a draft that defines the protocol number option in
> > UDP options. The protocol number option specifies the protocol
> > immediately following the UDP header.
[ ... ]
> Thanks Daiya for this submission. This draft sounds like it could be
> helpful in some cases.

The intent of this option is to supplement the UDP destination port
in identifying an upper layer protocol, but I question how useful this
can actually be, given (a) that no UDP implementation is required to
process or understand UDP options at all. and (b) implementations that
do support UDP options are not required to implement any options
beyond those listed in Section 8 of draft-ietf-tsvwg-udp-options as
must-support options. Based on those considerations, it seems to me
that the UDP destination port will have to be relied upon in any case,
making it unclear what benefit the protocol number option would have.

I could be persuaded otherwise if presented with a concrete use case
where the protocol number options would actually help, even though there
is no general assurance that the receiving endpoint will understand it.

Mike Heard