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Document: draft-ietf-dnsop-kskroll-sentinel-??
Reviewer: Jari Arkko
Review Date: 2018-08-29
IETF LC End Date: 2018-09-06
IESG Telechat date: Not scheduled for a telechat

Summary:

This document was easy to read, and I had no issues to raise. I believe the test that it describes is useful and important for the DNSSEC operational processes in the Internet.

I did, however, have one question and one minor issue discussed below, and several editorial observations.

Major issues:

Minor issues:

The document says:

   If the validating resolver has a forwarding configuration, and uses
   the CD bit on all forwarded queries, then this resolver is acting in
   a manner that is identical to a standalone resolver.

What does "using the CD bit" mean? Do you expect the bit to be set or not set? Please clarify the language.

The document says:

   nonV:  A non-security-aware DNS resolver will respond with an A or
      AAAA record response for "root-key-sentinel-is-ta", an A record
      response for "root-key-sentinel-not-ta" and an A or AAAA RRset
      response for the name that returns "bogus" validation status.

I do not understand why an old, non-DNSSEC aware resolver would respond in different ways to the -is-ta and -not-ta queries. But here you say an A record response is returned for -not-ta but A or AAAA RRset response is returned for -is-ta. What am I missing?

Nits/editorial comments: 

Section 3 table lists "A" as responses, while the text talks about "A or RRset response". Perhaps this could be aligned to avoid confusion.

Section 4 title is "Sentinel Tests from Hosts with More than One Configured Resolve". Shouldn't that be "... Resolvers"?

The document did not clearly specify whether the names queried (including the -is-ta and not-ta label) need to exist in the used domain, or if it is enough for the domain itself to exist. Perhaps this could be clarified.