Setup or Configure your network interface in Centos 5.6

Usually and in most cases your server's network interface name is eth0. And let us assume that eth0 is your network interface name.

And to setup or configure your IP address, Gateway and Netmask run this command.

vi /etc/sysconfig/network-scripts/ifcfg-eth0

You may get a result like this

DEVICE=eth0
BOOTPROTO=none
HWADDR=e0:69:95:50:39:6a
IPADDR=192.168.0.12
NETMASK=255.255.0.0
GATEWAY=192.168.0.1
ONBOOT=yes

Press the Insert key on your keyboard to make any changes on your eth0 config and after changing the correct IP Address, Netmask and Gateway you may press ESC on your keyboard then type :wq then press enter.