11.3. Bridged networking with libvirt

Bridged networking (also known as physical device sharing) is used to dedicate a physical device to a virtual machine. Bridging is often used for more advanced setups and on servers with multiple network interfaces.
To create a bridge (br0) based on the eth0 interface, execute the following command on the host:
# virsh iface-bridge eth0 br0

Important

NetworkManager does not support bridging. NetworkManager must be disabled to use networking with the network scripts (located in the /etc/sysconfig/network-scripts/ directory).
# chkconfig NetworkManager off
# chkconfig network on
# service NetworkManager stop
# service network start
If you do not want to disable NetworkManager entirely, add "NM_CONTROLLED=no" to the ifcfg-* network script being used for the bridge.