How can I enable or disable an Ethernet interface in Linux?
The ifup and ifdown commands can be used respectively to activate and deactivate a NIC interface. You must have an ifcfg file in the /etc/sysconfig/network-scripts directory for these commands to work.
Here is an example for interface eth0:
To shutdown eth0:
[root@linux etc]# ifdown eth0To enable eth0:
[root@linux etc]# ifup eth0
To make the change permanent, modify the interface config in the /etc/sysconfig/network-scripts directory. It will be named ifcfg-[interface], i.e. ifcfg-eth0 for Ethernet 0.
Open the file in your favorite editor and change:
ONBOOT=yes
to
ONBOOT=no
