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Re: Should a nameserver know about itself?

Jim Reid <Jim.Reid@nominum.com> Thu, 10 May 2001 10:18 UTC

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To: Mark.Andrews@nominum.com
Cc: Bruce Campbell <bruce.campbell@apnic.net>, dnsop@cafax.se
Subject: Re: Should a nameserver know about itself?
In-Reply-To: Message from Mark.Andrews@nominum.com of "Thu, 10 May 2001 11:25:26 +1000." <200105100125.f4A1PQv51440@drugs.dv.isc.org>
Date: Thu, 10 May 2001 00:55:54 -0700
Message-ID: <30735.989481354@shell.nominum.com>
From: Jim Reid <Jim.Reid@nominum.com>
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>>>>> "Mark" == Mark Andrews <Mark.Andrews@nominum.com> writes:

    >> Right.  Now that we've gotten that out of the way, can anyone
    >> suggest a *reliable* test for verifying that a nameserver is
    >> responding ( which is seperate from verifying that a nameserver
    >> is authoritatively serving a given zone )

    Mark> 	Send it a non-recursive query.  A nameserver should
    Mark> always answer even if it is just a header containing
    Mark> refused, servfail or notimp.

Yes, but there is one notorious DNS implementation that doesn't do
that. It fails to return any answer -- not even a referral for . -- if
it's asked for a name that it isn't authoritative for.

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