query an external nameserver doubt

[bsfinkel at anl.gov]

On 19.02.09 12:26, Nuno Ribeiro wrote:

>> There is a CNAME Record "www.example.test.com CNAME ts.example.test2.com"
>> in the "example.test.com" zone, which my nameserver is not authoritive. My
>> name server is authoritive for "example.test2.com" zone.
>> 
>> I receive a A query for "www.example.test.com". I send this query to
>> external nameservers and discover the CNAME record target is in my zone.
>> Is this possible?


And Matus UHLAR - fantomas <uhlar at fantomas.sk> replied:
>Yes, it's possible. They will reply with
>
>www.example.test.com CNAME ts.example.test2.com
>
>If they have recursion or query-cache enabled, they may also respond with
>ts.example.test2.com A in answer section and example.test.com NS info in
>authority/additional sections


I am not sure exactly what the OP wanted.  If he wants to be able to
send a query to find all of the DNS CNAME records that point to his
server, there is no way of doing this, as any domain could conceivably
contain such a CNAME record, and he would have to query every name
server.
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Barry S. Finkel
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