Description

RHEL-5.1 makes it possible for you to put guests in a private network behind dom0 and nat packets to your LAN through dom0. This is the preferred set up for laptops. If you create guests using virt-manager, it defaults the network setup to use natting, unless you explicitly select to bridge the network to xenbrx. The problem is that RHEL-5.1 does not enable ip forwarding by default in the kernel. So if you create guests and bridge them to virbr0, the guest wouldn't be able to communicate to the external networks. This can simply be solved by enabling ip forwarding in Dom0.

• Configuration: /etc/libvirt/qemu/networks/autostart/default.xml

How can I disable the virbr interface?

Remove the symbolic link /etc/libvirt/qemu/networks/autostart/default.xml