Activating and De-Activating your NIC

Commands for starting and stopping TCP/IP network services on an interface:

* Activate: /sbin/ifup eth0
(Also: ifconfig eth0 up - Note: Even if no IP address is assigned you can listen.)
* De-Activate: /sbin/ifdown eth0
(Also: ifconfig eth0 down)

These scripts use the scripts and NIC config
files in /etc/sysconfig/network-scripts/