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:[email protected]] On Behalf Of Bernard
Fay
Sent: Wednesday, August 03, 2016 3:32 PM
To: [email protected]
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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