Ubuntu ifconfig eth0

This is guide on how to use ifconfig to manage the first Ethernet card called eth0 in Ubuntu server. Ifconfig is used to configure the kernel-resident network interfaces. You can see my previous post on how to setup Ubuntu ifconfig static ip for more information.

The ethernet card is called eth in Ubuntu. Eth0 is Ethernet card 1, Eth1 is Ethernet card 2, Eth2 is Ethernet card 3, and so on.

In this article, I am going to show how I normally use ifconfig command to manage eth0 with ifconfig command.

Example 1 - Use ifconfig to bring up ethernet card:

luzar@ubuntu:~$ sudo ifconfig eth0 192.168.1.5 up 

The example above shows how to bring up the first ethernet card, eth0.

Example 2 - Use ifconfig to bring down ethernet card:

luzar@ubuntu:~$ sudo ifconfig eth0 192.168.1.5 down 

The example above shows how to bring down the first ethernet card, eth0.