How do I disable or enable a network interface


The command that disables and enables interfaces is ifconfig.  To get status
of an interface run "ifconfig <interface>".

        # ifconfig ie0
        ie0: flags=c43<UP,BROADCAST,RUNNING,MULTICAST,MULTI_BCAST>
                inet 129.134.49.23 netmask ffffff00 broadcast 129.134.49.255

ifconfig show ie0 is UP with an IP address of 129.134.49.23 and broadcast
address of 129.134.49.255.

To disable a network interface run "ifconfig <interface> down".

        # ifconfig ie0 down
        # ifconfig ie0
        ie0: flags=c42<BROADCAST,RUNNING,MULTICAST,MULTI_BCAST>
                inet 129.134.49.23 netmask ffffff00 broadcast 129.134.49.255

To re-enable the interface run "ifconfig <interface> up".

        # ifconfig ie0 up
        # ifconfig ie0 
        ie0: flags=c43<UP,BROADCAST,RUNNING,MULTICAST,MULTI_BCAST>
                inet 129.134.49.23 netmask ffffff00 broadcast 129.134.49.255


For more information see ifconfig(1).