To:
dnsop@cafax.se
From:
bert hubert <ahu@ds9a.nl>
Date:
Thu, 10 May 2001 10:30:03 +0200
In-Reply-To:
<Pine.BSF.4.21.0105100927150.43413-100000@julubu.staff.apnic.net>; from bruce.campbell@apnic.net on Thu, May 10, 2001 at 09:50:26AM +1000
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Sender:
owner-dnsop@cafax.se
Subject:
Re: Should a nameserver know about itself?
On Thu, May 10, 2001 at 09:50:26AM +1000, Bruce Campbell wrote: > 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 ) You could send a query for the SOA of the domain, and see if it answers with the AA flag set: $ dig ds9a.nl soa @outpost.ds9a.nl or to check automatically : $ dig ds9a.nl soa @outpost.ds9a.nl | grep "^\;\; flags" | grep -q " aa " Another check would be to ask for something in that domain that doesn't exist, and see if you get an authoritative NXDOMAIN back. Regards, bert hubert -- http://www.PowerDNS.com Versatile DNS Services Trilab The Technology People 'SYN! .. SYN|ACK! .. ACK!' - the mating call of the internet