[root@ns1 ~]# system-config-network-tui


Type above command and press Enter

Then this screen will appear

Select Device configuration and press Enter

Then this screen will appear

 

Here eth0 refers /etc/sysconfig/network-scripts/ifcfg-eth0
Whatever the edit made in eth0 that will affect to ifcfg-eth0 file

Resource : http://server-worlds.blogspot.com/