I have a Debian Dom0,

I have two domU's in bridge mode so they get a dhcp assigned ip address from the lan the dom0'd nic is on.

I want to setup a private point to point lan between the two domU's (ie a virtual eth1) how do I do that?

The goal is to setup heartbeat communication on a private network between the two domU's in a cluster and leave eth0 on each domU as-is so they are both accessible by ip address on the LAN.