BTW, not only did I have to lamboot, but I could not get the cluster to work on eth1 for my life! You can specify which ethernet card to use on the master but not on the compute nodes.
When the master is on eth1 the compute nodes can't find it if they are on eth0. I tried pulling the cables out of the compute nodes to force them to use eth1 but then they got stuck during bootup at the line setting up ipconfig on eth0!
So, don't be surprised when the tech guys come to my door with pitch forks...
Thanx,
AJG