John Levine wrote:
...

I'm guessing that it's intended to mean return the answer if you
already have it.  If so, we should document that.  I see that unbound
makes it an option but normally refuses any RD=0 queries.

it's a diagnostic query, like qtype=ANY, or qtype=NS. answering it should be privileged in some way, since it's an information leak that does not help the rdns operator in any way, but may help an attacker.

--
P Vixie

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