Change Ubuntu Server from DHCP to Static
added by Johan 1/13/13

After installing Ubuntu Server 12.04, it has set your server to use DHCP. You will most likely want to change it to use a static/fixed IP address.

We are going to edit the /etc/network/interfaces file. I use nano, but you can choose a different editor:

1. sudo su
enter your password

2. nano /etc/network/interfaces

For the primary interface, which is usually eth0, you will see these lines:

auto eth0
iface eth0 inet dhcp

As you can see, it’s using DHCP right now. We are going to change dhcp to static, and then there are a number of options that should be added below it.
Obviously you’d customize this to your network.

auto eth0
iface eth0 inet static

3. Save the file

Ctrl-X then Y

4. After saving the above file, restart the network with the following command:

service networking restart

Important: If running inside a virtual machine make SURE to change the interface from NAT to Bridged in the VM settings.