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