v1sh4l Use "PEERDNS=no". This option will prevent /etc/resolv.conf from being modified by a DHCP server. So instead of using DHCP-provided DNS, you can specify any arbitrary DNS servers you want to use in /etc/resolv.conf.
The configuration file for your network interface (e.g., eth0) looks like the following.
$ sudo vi /etc/sysconfig/network-scripts/ifcfg-eth0
Then, add static DNS to /etc/resolv.conf
$ sudo vi /etc/resolv.conf