Linux Basics - Set A Static IP On Ubuntu

Step 1: Configure the network interface

In this step you will manually configure your network interface by editing the following files using your preferred text editor(nano gedit vi). For the purpose of this example I am using the "nano" editor. You can edit the appropriate file by entering the following command into the terminal:

You can copy and paste directly from this line.

sudo nano /etc/network/interfaces

Enter your root password, once your prefered editor opens the file you can see...

auto lo eth0
iface lo inet loopback
iface eth0 inet dynamic

If you have more than one network card, please be sure to make changes to the correct network interface.

Statically configured network cards will have a section like:

auto lo eth0
iface lo inet loopback
iface eth0 inet static
        address xxx.xxx.xxx.xxx(enter your ip here)
        netmask xxx.xxx.xxx.xxx
        gateway xxx.xxx.xxx.xxx(enter gateway ip here,usually the address of the router)

If you use "nano" editor, type Ctrl+x to save changes.

Save modified buffer (ANSWERING "No" WILL DESTROY CHANGES) ?

<---type p="" y="">
File Name to Write: interfaces

<---enter p="">
Here is an example:
auto lo eth0
iface lo inet loopback
iface eth0 inet static
 address 192.168.1.101
 netmask 255.255.255.0
 gateway 192.168.1.1


Step 2: Configure the DNS servers
Changes in /etc/resolv.conf are required only on Systems with Ubuntu < 14.04, for newer Ubuntu versions the nameservers get configured in the /etc/network/interfaces file.

a) Ubuntu versions < 14.04

In this step you will manually configure your dns configuration file.

sudo nano /etc/resolv.conf

Once your editor opens the file you want to enter the following information...
nameserver xxx.xxx.xxx.xxx(enter your dns server ip)
nameserver xxx.xxx.xxx.xxx(enter your alt dns server ip)
If you use "nano" editor, type Ctrl+x to save changes.

Save modified buffer (ANSWERING "No" WILL DESTROY CHANGES) ?

<---type p="" y="">
File Name to Write: resolv.conf

<---enter p="">
Here is an example:
nameserver 8.8.8.8
nameserver 8.8.4.4
b) Ubuntu versions > 14.04

Open the /etc/network/interfaces file again and add a line dns-nameservers 8.8.8.8 right after the gateway line.

sudo nano /etc/network/interfaces
auto lo eth0
iface lo inet loopback
iface eth0 inet static
        address xxx.xxx.xxx.xxx(enter your ip here)
        netmask xxx.xxx.xxx.xxx
        gateway xxx.xxx.xxx.xxx(enter gateway ip here,usually the address of the router)
        dns-nameservers 8.8.8.8

The nameservers 8.8.8.8 and 8.8.4.4 are provided by Google for public use, so you can use them in your network configuration.

If you use "nano" editor, type Ctrl+x to save changes.

Save modified buffer (ANSWERING "No" WILL DESTROY CHANGES) ?

<---type p="" y="">
File Name to Write: interfaces

<---enter p="">
Step 3: Restart networking
Manually restart your network interface with the new settings.

For Ubuntu < 14.04 use the networking init script:

sudo /etc/init.d/networking restart

This should return a result that looks like the following:

*Reconfiguring network interfaces… [OK]

For Ubuntu versions > 14.04 use systemctl instead:

systemctl restart ifup@eth0

At this point you can check if the settings are correct:

ifconfig

If everything is correct you will get this result.

eth0      Link encap:Ethernet  direcciónHW 00:33:27:46:2v:34
          Direc. inet:192.168.1.101  Difus.:0.0.0.0  Másc:255.255.255.0
 ...

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