nslookup sucks. What’s most likely happening is:
· On your initial query, some sort of transient error is occurring while trying to resolve centos.mirror.iweb.ca, e.g. a timeout, a misconfigured server returning SERVFAIL, a delegated server not being authoritative, etc. · nslookup fails that query, then, behind the scenes (and unbeknownst to you) it starts searchlisting, e.g. looking up centos.mirror.iweb.ca.example.com. This results, as one might expect, in an NXDOMAIN · nslookup (mis)reports NXDOMAIN as the result of the overall lookup You can turn on “-debug” to nslookup to see if this is what’s really happening. Or, dump nslookup altogether and use a real DNS troubleshooting tool like “dig”. - Kevin From: bind-users [mailto:bind-users-boun...@lists.isc.org] On Behalf Of Bernard Fay Sent: Wednesday, August 03, 2016 3:32 PM To: bind-users@lists.isc.org Subject: NXDOMAIN but still get it... [ ~]# nslookup centos.mirror.iweb.ca<http://centos.mirror.iweb.ca> Server: 172.21.241.18 Address: 172.21.241.18#53 ** server can't find centos.mirror.iweb.ca<http://centos.mirror.iweb.ca>: NXDOMAIN But ... [ ~]$ nslookup iweb.ca<http://iweb.ca> Server: 172.21.241.18 Address: 172.21.241.18#53 Non-authoritative answer: Name: iweb.ca<http://iweb.ca> Address: 174.142.1.18 [ ~]$ nslookup mirror.iweb.ca<http://mirror.iweb.ca> Server: 172.21.241.18 Address: 172.21.241.18#53 Non-authoritative answer: Name: mirror.iweb.ca<http://mirror.iweb.ca> Address: 192.175.120.177 [ ~]$ nslookup centos.mirror.iweb.ca<http://centos.mirror.iweb.ca> Server: 172.21.241.18 Address: 172.21.241.18#53 Non-authoritative answer: Name: centos.mirror.iweb.ca<http://centos.mirror.iweb.ca> Address: 192.175.120.169 What am I missing? There is definitely something I do not understand.
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