/etc/network/interfaces
#
The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
allow-hotplug eth1
iface eth1 inet static
address 192.168.100.11
netmask 255.255.255.0
network 192.168.100.0
broadcast 192.168.100.255
gateway 192.168.100.1
# dns-* options are implemented by the resolvconf package, if installed
dns-nameservers 192.168.100.1 8.8.8.8
dns-search theprodigy
В гуях оболочку xfce использую,там таких настроек не нашел.