I'm running some tests on a Debian server. The network in which this server is located has two DNS servers (I don't know why and I can't change this). I used to need to point
/etc/resolv.conf to one of these servers and I recently had to change which server I use. Since I changed
/etc/resolv.conf to point to the new server, the configuration keeps changing behind my back every few days (it changes back to the old server).
For all I know, the machine has not rebooted. What should I check to figure out why this happens, and how can I stop it?