Last Call Review of draft-ietf-dprive-unilateral-probing-12
review-ietf-dprive-unilateral-probing-12-artart-lc-gondwana-2023-09-07-00

I am the ARTART reviewer for this document.  Apologies for the delay in sending
my review.

I found it very well written and easy to follow.  It's clear why this guidance
is being written, and it's clear to me how to implement it.

My only concern is that it does fall back very easily to cleartext, for a long
damping period.  As a protocol implementer myself, I would generally expect to
retry something one or two more times over the course of a few minutes before
giving up entirely for 24h, since the server at the other end may have just
been restarting and either dropped an existing connection or rejected a SYN
packet, but be ready a moment later.  I'd be happy with a limit of something
like 5 tries over 2 minutes (one every 30 seconds) before giving up.

Thanks again for this document, and I look forward to my DNS being slightly
safer in future.