Perform the following steps to configure additional network devices for your guest.

Edit your guest configuration file in /etc/xen/YourGuestName replacing YourGuestName with the name of your guest.

The original entry may look like the one below.

vif = [ "mac=00:16:3e:2e:c5:a9,bridge=xenbr0" ]

Add an additional entry to the “vif=” section of the configuration file similar to the one seen below.

vif = [ "mac=00:16:3e:2e:c5:a9,bridge=xenbr0",
    "mac=00:16:3e:2f:d5:a9,bridge=xenbr0" ]

Make sure you generate a unique MAC address for the new interface. You can use the command below.

# echo 'import virtinst.util ; print virtinst.util.randomMAC()' | python

After the guest has been rebooted perform the following step in the guest operating system. Verify the update has been added to your /etc/modules.conf in Red Hat Enterprise Linux 3 or /etc/modprobe.conf in Red Hat Enterprise Linux 4 and Red Hat Enterprise Linux 5. Add a new alias for each new interface you added.

alias eth1 xen-vnif

Now test that each new interface you added make sure it is available inside the guest.

# ifconfig eth1

The command above should display the properties of eth1, repeat the command for eth2 if you added a third interface, and so on.

Now you can configure the new network interfaces using redhat-config-network or Red Hat Enterprise Linux3 or system-config-network on Red Hat Enterprise Linux 4 and Red Hat Enterprise Linux 5.