[DNSOP] draft-ietf-dnsop-refuse-any - why not NOTIMP?

Ray Bellis <ray@bellis.me.uk> Mon, 07 August 2017 11:14 UTC

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From: Ray Bellis <ray@bellis.me.uk>
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Date: Mon, 7 Aug 2017 12:14:23 +0100
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Subject: [DNSOP] draft-ietf-dnsop-refuse-any - why not NOTIMP?
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Having looked at this a few months ago when one of our partners was
(briefly) returning NOTIMP for ANY queries, I find myself wondering why
this isn't discussed in the draft?

The draft does talk about *new* RCODEs, but not existing ones.

My reading of RFC 1035 is that it would be a perfectly appropriate
response from a server that doesn't support ANY.

Unfortunately the retry semantics of DNS are not well specified and
therefore implementation differences may occur.  If as a result NOTIMP
is really not usable then IMHO this should also be documented.