To make your box have a static IP in Ubuntu 12.04 that will never change, it’s quite simple. Let’s start off pulling up the interfaces with this command :
sudo nano /etc/network/interfaces
Go ahead and delete it, and add this :
auto lo eth0 iface lo inet loopback iface eth0 inet static address XXX.XXX.XXX.XXX netmask XXX.XXX.XXX.XXX gateway XXX.XXX.XXX.XXX
Make sure that Address = What you want your IP to be. Netmask = You’re netmask. Gateway = You’re router’s IP.
End with a ctrl+x then hit Y to save and an enter. Next let’s add your name servers. Run this command to edit:
sudo nano /etc/resolv.conf
You will see that it states : # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8) # DO NOT EDIT THIS FILE BY HAND — YOUR CHANGES WILL BE OVERWRITTEN So we have to go edit the static file :
sudo nano /etc/resolvconf/resolv.conf.d/base
Feel free to use these Nameservers as they are from opendns, but make sure you delete everything in the file already (it most likely will be an empty file.
nameserver 208.67.222.222 nameserver 208.67.220.220
End with a ctrl+x then hit Y to save and an enter. Finally let’s restart all the services so that we know everything is set :
sudo /etc/init.d/networking restart