virtual interface

How would i create virtual interface in linux to configure more than one IP address for a physical interface?
any help wll be appreciated.

the "old" way is to do this:

ifconfig eth0:1 192.168.10.2 netmask 255.255.255.0

The "new" way is with the "rproute" toolset:

ip addr add 192.168.10.2/24 dev eth0

Got it?