IPアドレスを固定にする方法

/etc/network/interfaces を sudo vi で以下のように編集

$ cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
#iface eth0 inet dhcp
iface eth0 inet static
address 192.168.177.181
netmask 255.255.255.0
gateway 192.168.177.1

有効にするためには

sudo /etc/init.d/networking restart

参考にしたページ
http://www.ubuntugeek.com/ubuntu-networking-configuration-using-command-line.html