Ubuntu Static IP

setup static IP address under Ubuntu

Ubuntu Linux stores all network configuration option in /etc/network/interfaces configuration file. You need to open this file using a text editor such as vi or gedit.

Open terminal (command line)

Type the following command:
#sudo vi /etc/network/interfaces
OR
sudo gedit /etc/network/interfaces
Make the changes as follows:

auto eth0
iface eth0 inet static
address 192.168.1.100
netmask 255.255.255.0
broadcast 192.168.1.255
gateway 192.168.1.254

Save and close the file. Restart networking:
$ sudo /etc/init.d/networking restart