Installation guide

Chapter 6. Virtualized guest installation overview

TYPE=Bridge

BOOTPROTO=dhcp

ONBOOT=yes

Warning

The line, TYPE=Bridge, is case-sensitive. It must have uppercase 'B' and lower case

'ridge'.

b. Start the new bridge by restarting the network service. The ifup installation command

can start the individual bridge but it is safer to test the entire network restarts properly.

# service network restart

c. There are no interfaces added to the new bridge yet. Use the brctl show command to view

details about network bridges on the system.

# brctl show

bridge name bridge id STP enabled interfaces

installation 8000.000000000000 no

virbr0 8000.000000000000 yes

The virbr0 bridge is the default bridge used by libvirt for Network Address Translation

(NAT) on the default Ethernet device.

2. Add an interface to the new bridge

Edit the configuration file for the interface. Add the BRIDGE parameter to the configuration file with

the name of the bridge created in the previous steps.

# Intel Corporation Gigabit Network Connection

DEVICE=eth1

BRIDGE=installation

BOOTPROTO=dhcp

HWADDR=00:13:20:F7:6E:8E

ONBOOT=yes

After editing the configuration file, restart networking or reboot.

# service network restart

Verify the interface is attached with the brctl show command:

# brctl show

bridge name bridge id STP enabled interfaces

installation 8000.001320f76e8e no eth1

virbr0 8000.000000000000 yes

3. Security configuration

Configure iptables to allow all traffic to be forwarded across the bridge.

# iptables -I FORWARD -m physdev --physdev-is-bridged -j ACCEPT

# service iptables save