How to assign a IP address on Ubuntu Server !!!

Assigning IPs to the server running Ubuntu as OS.

Here in the scenario we will consider that the server already has 1 IP address 192.168.1.2 added and with network address 192.168.1.1 and you wish to add 92.168.1.3 to the server

To check the available Ethernet interfaces on the server, you can use the ifconfig command as shown below

ifconfig -a | grep eth

This will give the output as below

eth0 Link encap:Ethernet HWaddr 00:15:c5:4a:16:5a

Now to add the IP temporarly use the command

sudo ifconfig eth0:1 192.168.1.3 up

OR

sudo /sbin/ifconfig eth0:1 192.168.1.3 up

This will add the IP address temporarly to add it permemantly you need to follow the below steps
The ethernet configuration on Ubuntu server is in the configuration file is /etc/network/interfaces

Edit the file

sudo vi /etc/network/interfaces

Append the following configuration:

auto eth0:1
iface eth0:1 inet static
name Ethernet alias LAN card
address 192.168.1.3
netmask 255.255.255.0
broadcast 192.168.1.255
network 192.168.1.0

Save the file and restart system or restart the network:

sudo /etc/init.d/networking restart