Ken Price wrote: > This line ... > >> ;; SERVER: 4.2.2.1#53(4.2.2.1) > > ... tells you the DNS server which returned the result, which in this > case, is more than likely a caching (recursive) DNS server. If > verbose enough logging is enabled on that caching server, it should > tell you which primary DNS server returned a particular query result. > The "@ns1.myserver" feature in DIG allows you to do that test directly > from your workstation to the primary DNS server(s). Is there any > particular reason this won't work for you? Perhaps if you explained > your problem in more detail, someone on this list could offer > alternative methods of troubleshooting. > > Regards, > Ken > > > > > ----- Message from Rudi at SoftDux.com --------- > Date: Mon, 07 Jul 2008 17:38:22 +0200 > From: Rudi Ahlers <Rudi at SoftDux.com> > Reply-To: CentOS mailing list <centos at centos.org> > Subject: Re: [CentOS] how do I find out which nameserver returns a > DNS query? > To: CentOS mailing list <centos at centos.org> > > > >>>> >>> >> Hi Ken >> >> I thought dig would return it, but it doesn't. >> >> Look at this: >> >> >> dig hfserver1.hostfactor.co.za >> >> ; <<>> DiG 9.3.3rc2 <<>> hfserver1.hostfactor.co.za >> ;; global options: printcmd >> ;; Got answer: >> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 17016 >> ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 >> >> ;; QUESTION SECTION: >> ;hfserver1.hostfactor.co.za. IN A >> >> ;; ANSWER SECTION: >> hfserver1.hostfactor.co.za. 6000 IN A 196.34.136.50 >> >> ;; Query time: 287 msec >> ;; SERVER: 4.2.2.1#53(4.2.2.1) >> ;; WHEN: Mon Jul 7 17:36:45 2008 >> ;; MSG SIZE rcvd: 60 >> >> >> >> I know I can dig @server - but I want to know which is the active >> server that returns a result at the moment >> >> -- Ok, sorry, let me re-phrase. I want to know on my own server, which of my nameservers replied to the DNS query. In this example 4.2.2.1 is our ISP's upstream DNS server, which is configured in /etc/resolv.conf - so it should technically appear there. But, let's say I query host1.myserver.co.za - and myserver.co.za is on another server, and has ns1.myserver.co.za, ns2.myserver.co.za, ns3myserver.co.za & ns4.myserver.co.za So, as far as I know, any one of those can reply (round robbin DNS?), but I would like to know which one replies for this particular dig. Is that possible? I don't want to specify a server to query, I want to find out which of the 4 returns the query. If it's a cached reply, does it mean I won't see it? -- Kind Regards Rudi Ahlers CEO, SoftDux Web: http://www.SoftDux.com Check out my technical blog, http://blog.softdux.com for Linux or other technical stuff, or visit http://www.WebHostingTalk.co.za for Web Hosting stuff