Hi DNSOP,

John Todd, Puneet Sood, and myself have just posted a new draft [1] with a very 
simple premise: if you're sending queries to a resolver just to see if you get 
a response, query "probe.resolver.arpa".  This name is (proposed to be) 
guaranteed NXDOMAIN, and the purpose of the query is unambiguous to someone 
inspecting the resolver logs.

This is an extremely straightforward proposal, but there are a few questions:

* Is this a Special Use Domain Name (as the -00 draft claims)?
* Should this draft go to DNSOP or ADD?
* Should we extend this concept to authoritative servers?
* Name bikeshed.

We welcome your input.

--Ben Schwartz

[1] https://datatracker.ietf.org/doc/draft-sst-dnsop-probe-name/

P.S.  We wrote this before some recent discussion about names guaranteed not to 
exist, which may be evidence that this could be useful.

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