[Cialug] DNS Issues

[Stuart Thiessen]

I have been running the SUSE online updates periodically. I had no 
problems until today. All of a sudden, email is holding up in the queue 
and that was the clue that it was not able to use DNS to find the 
servers to pass along the emails.  I did a ping and it pings to our BSD 
firewall with no problem, but it cannot ping any name or ip address 
outside the firewall.  All other computers on that network are working 
just fine to get to the internet. Only this email server is messed up.  
I restarted nscd twice to no avail.  I reset resolv.conf to point to my 
DNS servers instead of theirs, but that didn't work. I tried pointing 
it to the firewall, but that didn't work, then I just left it as it was 
originally (which was working prior to today). I did restart nscd each 
time I changed resolv.conf.

No updates have happened in about a week's time and the problem cropped 
up today. So I don't think it is the result of an update.

Any other suggestions?  What is the log for resolv.conf?

Thanks,

Stuart

On Aug 23, 2005, at 16:04, albus wrote:

> have you done an update? and if so have you checked iptables?
>
> joel
>
>
> ----- Original Message ----- From: "Stuart Thiessen" 
> <sthiessen at passitonservices.org>
> To: "Central Users Group Iowa Linux" <cialug at cialug.org>
> Sent: Tuesday, August 23, 2005 3:57 PM
> Subject: [Cialug] DNS Issues
>
>
>> Ok, I have encountered a very strange issue .... DNS on one server 
>> was working fine using Qwest DNS servers and all of a sudden this 
>> afternoon it stopped working. I checked resolv.conf and compared it 
>> to our firewall server and it is the same. The firewall server is 
>> doing just fine with DNS queries, but not this other server. It 
>> handles email and webmail from behind the firewall.  It can ping the 
>> firewall but it can't ping outside with name or IP.  My next step is 
>> to check the firewall, but no one else behind the firewall is 
>> complaining about being unable to get out.  This is preventing the 
>> email from getting out.
>> Any thoughts?
>> Thanks,
>> Stuart
>> This is SUSE Linux 9.2. I ran the updates recently on it.  I'm a 
>> little confused as to what is going on.
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