Nagios checks and DNS queries

[Dirk H. Schulz]

Hi folks,

I have two servers running Nagios, one is 2.3.1 on Debian, the other 3.0.5 
on CentOS. With both I have a peculiar problem:

Both of the servers have 3 different nameserves in /etc/resolv.conf, but 
when the first nameserver fails, then more than half of the service checks 
fail ("plugin timed out"). The failure does not occur just shortly, but 
takes as long as the first nameserver is not running.
This first nameserver in /etc/resolv.conf is not the master nameserver (all 
of them are slaves), so it is not a problem of the slave stopping answering 
when the master fails or any misconfiguration between the nameservers.

This should not be occuring, but it can be reproduced reliably. Now I hope 
that there is some configuration item I overlooked, but googling did not 
deliver any hint.

Any help is appreciated.

Dirk

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