Red Hat ENTERPRISE LINUX 5 - VIRTUALIZATION GUIDE Manual page 159

# service NetworkManager stop
# service network start
Note
Instead of turning off NetworkManager, you can add "NM_CONTROLLED=no" to the
ifcfg-* scripts used in the examples.
Creating network initscripts
Create or edit the following two network configuration files. This step can be repeated (with different
names) for additional network bridges.
Change to the /etc/sysconfig/network-scripts directory:
# cd -/etc/sysconfig/network-scripts
Open the network script for the device you are adding to the bridge. In this example, ifcfg-eth0
defines the physical network interface which is set as part of a bridge:
DEVICE=eth0
# change the hardware address to match the hardware address your NIC uses
HWADDR=00:16:76:D6:C9:45
ONBOOT=yes
BRIDGE=br0
Tip
You can configure the device's Maximum Transfer Unit (MTU) by appending an MTU
variable to the end of the configuration file.
MTU=9000
Create a new network script in the /etc/sysconfig/network-scripts directory called ifcfg-
br0 or similar. The br0 is the name of the bridge, this can be anything as long as the name of the file
is the same as the DEVICE parameter.
DEVICE=br0
TYPE=Bridge
BOOTPROTO=dhcp
ONBOOT=yes
DELAY=0
Warning
The line, TYPE=Bridge, is case-sensitive. It must have uppercase 'B' and lower case
'ridge'.
After configuring, restart networking or reboot.
Bridged networking with libvirt
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