This is a continuation of the thread: "Something went wrong with DNS, plz help!"
Now, the issue became clearer, so I decided to start a new thread with more descriptive Subject. In short: the contents of the file /etc/resolv.conf is unpredictably different from one reboot to another. It is either # Generated by net-scripts for interface lo domain mynetwork or # Generated by net-scripts for interface "eth0" nameserver My.First.DNS-Server.IP nameserver My.Second.DNS-Server.IP nameserver 8.8.8.8 I tried to chmod this file to be unwrittable even for root but after a reboot it have been overwritten anyway.
