How to delete and add network interfaces in Linux

Besides of taking them off, you have to delete, also. the following file:

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

where 0 can be any other number, accordingly.

In order to properly add a network interface, besides of putting it into the slot (virtual or physical), you need to add and edit the same file as above. Example:

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


DEVICE=eth0
BOOTPROTO=none
BROADCAST=192.168.166.255
HWADDR=00:21:F6:00:00:10
IPADDR=192.168.166.12
NETMASK=255.255.255.0
NETWORK=192.168.166.0
ONBOOT=yes
TYPE=Ethernet
GATEWAY=192.168.166.1

After you edit the text, with the right parameters, you can save it and:

/etc/init.d/network/restart

Enjoy!