Jethro R Binks wrote:
However, your comments are probably correct in practice because those implementing multiple hostnames -> single IP rarely put in the corresponding multiple PTR records from the in-addr.arpa entry back to each of the hostnames.
I said "in practice" and I meant it (I do know the RFC's in question). I'm not aware of any common application which supports multiple PTR records correctly, even if configured correctly at the DNS level. It can even cause problems with authoritative DNS servers which return records in a random order (like tinydns), where the client library may receive a different in-addr.arpa answer every time it is run.
John
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