Bcrtl

bridge utils

bridge add

brctl addbr our-bridge

bridge show

brctl show
bridge name	bridge id		STP enabled	interfaces
lan		8000.00221524dfd0	no		eth0
our-bridge	8000.000000000000	no

dummy interface

modprobe dummy
ifconfig dummy0 10.11.12.13 netmask 255.255.255.0 up