[DNSOP] Martin Duke's Discuss on draft-ietf-dnsop-avoid-fragmentation-16: (with DISCUSS and COMMENT)

[Martin Duke via Datatracker <[e-mail]>]

Martin Duke has entered the following ballot position for
draft-ietf-dnsop-avoid-fragmentation-16: Discuss

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DISCUSS:
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1) I'm unclear about Sec 4, R11 and Appendix B. When configured for minimal
response, are responses to ALL requesters reduced in size, or only to those
requesters that indicate a small MTU?

As DNS becomes a more important vehicle for various discovery protocols (e.g.
ECH), I would hate for responders to globally invoke a policy that makes it
hard to deploy those protocols. But I'm happy to discuss this.

2) In section 3.2, R8, please add RFC 8961 as a normative reference for how to
set the timeout (e.g. "UDP requestors MUST observe [RFC8961] in setting their
timeout.")


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COMMENT:
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Thanks to Mirja Kuhlewind for the TSVART review, and to the authors for
responding.

(1) I support Rob's DISCUSS (and Paul's comment) about SHOULD/MAY. "do it
unless the OS makes it impossible" is a typical use of SHOULD.

(2) Section 3.1, R1 says that responders SHOULD omit the fragment header. Under
what circumstances would it be reasonable to keep it?