interfaces

#ubuntu

/etc/network/interfaces

[static]

auto lo

iface lo inet loopback

auto eth0

iface eth0 inet static

address 192.168.0.1

network 192.168.0.0 #

netmask 255.255.255.0

broadcast 192.168.0.255 #

gateway 192.168.0.254

dns-nameserver a.b.c.d

[dynamic]

auto lo

iface lo inet loopback

auto eth0

iface eth0 inet dhcp