# Re: URN to URC scenario

Ruediger Volk (rv@deins.Informatik.Uni-Dortmund.DE)
Mon, 28 Feb 1994 15:32:05 +0100

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    To: Martin Hamilton <M.T.Hamilton@lut.ac.uk>

    Subject: Re: URN to URC scenario

    In-Reply-To: Your message of "Mon, 28 Feb 1994 12:21:05 GMT."

                 <199402281221.MAA18549@lust.mrrl.lut.ac.uk>

    Date: Mon, 28 Feb 1994 15:32:05 +0100

    Message-Id: <14805.762445925@deins.Informatik.Uni-Dortmund.DE>

    From: Ruediger Volk <rv@deins.Informatik.Uni-Dortmund.DE>

Martin Hamilton said:
> There is provision for this in MX (mail exchanger) records - you
> can create wildcards which match everything in a particular domain.
> Some bright spark has registered one for the entire .gb domain, so
> we get things like this...
>
> :-).gb. 360000 MX 10 sun2.mhs-relay.ac.uk.
> :-).gb. 360000 MX 11 sun.mhs-relay.ac.uk.
>
> I don't believe current TXT RR implementations include anything like
> this, but would prefer to see the client strip off a domain component,
> viz. bloggs.path.net.urn.int -> path.net.urn.int.
the wildcard specification is a generic feature of DNS, it's not restricted
to any particular RR type (it seems only for SOA it cannot be used, though
on several other types it would extremely stupid).
However wildcards are most often used on MX - unfortunately in most cases
the wildcard MX' provide semantics not intended by the DNS most domain
administrators. Unless reading the RFCs VERY carefully everybody is
surprised about how they really work.

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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