/etc/resolv.conf -> servidores dns

/etc/sysconfig/network/network-scripts/ifcfg-eth0 -> Fichero de configuracion de la interfaz
Fichero de ejemplo
# Intel Corporation 82566DM-2 Gigabit Network Connection
DEVICE=eth0
BOOTPROTO=static
HWADDR=00:19:99:7B:88:B8
ONBOOT=yes
TYPE=Ethernet
IPADDR=192.168.1.208
NETMASK=255.255.255.0
NETWORK=192.168.1.0
GATEWAY=192.168.1.150

service networking restart -> Reinicia la red