[ILUG] dns problem
pete at yerma.org
Wed Apr 6 12:31:39 IST 2005
On Wed, Apr 06, 2005 at 11:09:54AM +0100, Declan Grady wrote:
> I have a debian woody firewall running caching only nameserver (bind9).
> outside world is on eth1, and local lan on eth0
> I also have a redhat7 mailserver on the eth0 lan.
> Most things seem to be working ok, but ...
> I currently have a load of email (well, not a load, only about 20 or so)
> backed up
> for one destination domain, and mailq tells me ' host name lookup failure'
What MTA is this? I thought mailq only showed what mail was on the
queue waiting to be delivered.
> However, if I go to the firewall, and 'dig' that domain it does resolve ok.
> I dont have dig or nslookup on the mailserver, so cannot do the same
> dig/nslookup there.
I would install dnsutils or whatever the equivalent redhat package is.
> on the mailserver, my /etc/resolv.conf reads :
> nameserver 192.168.x.x
> where 192.168.x.x is the IP of the firewall
> Routing seems ok, and fetchmail works from the mailserver to get my odmr
> email ok. (also using dns to resolve the hostname)
> Incoming mail seems ok .. some dns failures for the same domain name I
> have problems sending to ... possibly an error in the config of that
> domain's dns 'setup' ?
> How do I go about finding what the problem is ?
You can toggle verbose logging with "rndc querylog" , but I've found
restarting bind9 can solve a lot of problems.
It might also help to mention what the domain is, so people can
ascertain whether there are existing mx/a records.
More information about the ILUG