Linux Administration Cookbook

Adding and removing an IP against an interface

This can be accomplished with the ip address command, but does require root.

In this example, I chose another IP in the 192.168.33.0/24 subnet, which I know isn't in use:

In the real world, it's good practice to ping an IP first, even if you believe it's free to use.

$ sudo ip address add 192.168.33.22/24 dev eth1

Checking our eth1 interface, we can now see the secondary IP:

3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000    link/ether 08:00:27:0d:d9:0c brd ff:ff:ff:ff:ff:ff    inet 192.168.33.10/24 brd 192.168.33.255 scope global noprefixroute eth1       valid_lft forever preferred_lft forever    inet 192.168.33.22/24 scope global secondary eth1 valid_lft ...