How to add additional ip into linux - ubuntu

modify /etc/network/interfaces

add the following


auto eth0:0
iface eth0:0 inet static
address xx.xx.xx.xx
gateway xx.xx.xx.xx
netmask xx.xx.xx.xx
network xx.xx.xx.xx
broadcast xx.xx.xx.xx

example,

auto eth0:0

iface eth0:0 inet static

address 192.168.0.100

gateway 192.168.0.1

netmask 255.255.255.0

network 192.168.0.0

broadcast 192.168.0.255

AND, finally restart networking service

/etc/init.d/networking restart