Another strange dns question (and I have RTFM)

[Kevin Darcy]

Nick Brooks wrote:

>I'm in the process of upgrading my server at home and have migrated from 
>RH 7 to Fedora Core 3.
>
>My machines are:-	
>
>aquanta.sixandseven.net 192.168.1.100 (FC3) (new)
>server.sixandseven.net 192.168.1.100  (RH7) (old)
>
Both machines are on the same IP address? I suspect that's a typo...

>The old machine (server) was working fine: ie
>
>     # dig @192.168.1.1 demon.net
>
>gives the expected reply
>
> From my new server
>
>     # dig demon.net
>
This'll use whatever is configured in your /etc/resolv.conf. Without 
having seen the contents of that file, one can only guess what 
nameserver it is using.

>     # dig @localhost demon.net
>
This of course will query "localhost", which may or may not be the same 
nameserver that was queried in the previous "dig".

>     # dig @aquanta demon.net
>
This will query whatever nameserver is listening on the address to which 
the short name "aquanta" resolves. Don't know what that would be...

>
>all give the same (correct) response BUT
>
>     # dig @192.168.1.100 demon.net
>
>gives
>
>	; <<>> DiG 9.2.4 <<>> @192.168.1.100 demon.net
>	;; global options:  printcmd
>	;; connection timed out; no servers could be reached
>
Looks like your new nameserver can't communicate with Internet 
nameservers, for some reason. Check firewall rules, NAT, etc. Sniff packets.

>The only difference I can see is that the log files show a slight 
>difference when named is started:-
>
>New machine shows:-
>named[27598]: loading configuration from '/etc/named.conf'
>named[27598]: listening on IPv4 interface lo, 127.0.0.1#53
>named[27598]: listening on IPv4 interface eth0, 192.168.1.100#53
>
>Old machine shows:-
>named[7938]: loading configuration from '/etc/named.conf'
>named[7938]: listening on IPv4 interface lo, 127.0.0.1#53
>named[7938]: listening on IPv4 interface eth0, 192.168.1.1#53
>
If the machines have different IP addresses (as opposed to what you 
showed above), then you should expect these log entries to differ 
between the machines.

- Kevin