RE: [cobalt-users] Reslove/DNS problem?

["Andy Brown" <andy.brown@xxxxxxxxxxxxx>]

> Hi all,
> We have 2 Raq4i servers, latest updates installed. Everything 
> seems to work 
> fine with one exception - neither server seems to be aware of 
> the other. 
> From server 1, we can ping and traceroute domains on server 2 
> ONLY by using 
> IP's.....same goes for server 2 to server 1. Trying to do so 
> with domain 
> names won't work. Also, email sent from a domain on either 
> server to the 
> other gets bounced and causes NXDOMAIN errors in the logs. 
> We've checked and 
> double-checked zone files, etc, all appears to be okay.
> Any suggestions or tips are greatly appreciated.


Hi Mike,
Something to be aware of with linux nameservers is your Reverse DNS
entry for the IP addresses you are using.
If the IP address does not reverse resolve, then the nameserver will not
function correctly.
Most of the time you just contact your uplink and ask for them to add in
a reverse dns entry for the IP. For example:
Machines ip:  195.58.133.133
Reverse entry: myraq.mydomain.com

So when you do:
Nslookup 195.58.133.133
It should reply with myraq.mydomain.com

This could be your problem here. Now onto a bigger problem, if you're
uplink cannot put in a rDNS entry (which many can't as half of them
don't understand how it works!!!) then you can 'fool' the dns server
into working.
You need to create your own reverse entry for your servers own IP
addresses. By doing this it tricks your nameserver into thinking it can
reverse resolve itself and should start to work.


Hope that solves it for you, if not, or if confused post back!

Andy
andy@xxxxxxxxxxxxxxxxxxxxx
http://ineedlinux.info/