Configure Static IP In Ubuntu Server

1. open the /etc/network/interfaces file.
2. auto eth0
   iface eth0 inet static
   address 192.168.1.100
   netmask 255.255.255.0
   network 192.168.1.0
   broadcast 192.168.1.255
   gateway 192.168.1.1
3. sudo /etc/init.d/networking restart
4. Add DNS in /etc/resource