[Last-Call] Dnsdir last call review of draft-ietf-taps-impl-15

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Reviewer: Peter van Dijk
Review result: Ready with Nits

This document is written very clearly. I much appreciate the phrase "This is
not meant to restrict implementations from structuring racing candidates
differently."

In 4.1.1.1, "... send DNS queries for both A (IPv4) and AAAA (IPv6) records
...", this assumes no other address types will exist in the future. RFC8499
uses "address records" to refer to A/AAAA and any future variants implicitly,
pointing out that RFC2181 informally says "(A, AAAA, etc)". I'm not aware of a
more useful formal reference than 8499, so perhaps something like ".. send DNS
queries for address records, which currently means sending A (IPv4) and AAAA
(IPv6) queries ..."?

While ietf-taps-interface mentions SRV records briefly, this document does not.
An SRV record set could cause a single RemoteSpecifier to map to multiple
names. HTTPS and SVCB records can also cause indirection to multiple names (and
even transport indications). I do not think the document should go into detail
on all of these, but, as with address records, perhaps it can mention that DNS
lookups can involve an extra layer of indirection, and provide SRV, HTTPS and
SVCB as current examples.

Typo in 4.1.1.2: "intefaces"

In 4.3.2, "should follow the Happy Eyeballs algorithm described in [RFC8305]."
- should this be a "SHOULD"? (I noticed a few other lowercase "should"s as
well.)

I did not review sections 5, 6, 7 and 8 (other than a cursory check that they
do not mention DNS or name resolving).

In 9.1, ".. resolution answers (A and AAAA queries, for example)" - the queries
are not cached, (part of) their responses is cached. Perhaps ".. resolution
answers (from A and AAAA queries, for example"

No comments on section 10, 11.

Should 12.2 mention DNSSEC? I can very much understand it if you say no :-)


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