# Re: Possible Cool idea...

Ruediger Volk (rv@deins.informatik.uni-dortmund.de)
Mon, 02 May 1994 16:03:56 +0200

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    To: Martin Hamilton <martin@mrrl.lut.ac.uk>

    Subject: Re: Possible Cool idea...

    In-Reply-To: Your message of "Mon, 02 May 1994 13:28:35 BST."

                 <8hlD7nmSTRk7M3erBz@mrrl.lut.ac.uk>

    Date: Mon, 02 May 1994 16:03:56 +0200

    Message-Id: <6625.767887436@seins.Informatik.Uni-Dortmund.DE>

    From: Ruediger Volk <rv@deins.informatik.uni-dortmund.de>

> We can combine gethostbyname() with a TXT lookup by calling
> res_mkquery() with type T_ANY instead of T_TXT. The result should be
> all of the records associated with the domain name - i.e. the union of
> gethostbyname and a TXT lookup. This hardly increases the network
> traffic at all, and the code to implement it is trivial.
canonical DNS error alert!!!
Query type NAY returns ONLY those RRs for the queried name that the server
happens to know; if the the responding server is NOT authoritative
for the name in general only the SUBset of currently cached RRs under
that name are returned.
Only if you happen to get an authoritative response, you can know that you got
really all RRs; note that with the currently deployed DNS software there
is usually no easy (e.g. single query/response) way to force getting an
authoritative response.

Ruediger

Ruediger Volk
Universitaet Dortmund, Informatik IRB
D-44221 Dortmund, Germany

E-Mail: rv@Informatik.Uni-Dortmund.DE
Phone: +49 231 755 4760 Fax: +49 231 755 2386

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