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Automatic Discovery (Rendezvous) Not working with two separate subnets on Head Node

We have set up an Xserve Head Node with 8 Xserve compute nodes. The Head node connects to the other Compute nodes in the compute cluster via the 2nd ethernet port (en1) and a fanned ethernet switch - this forms a local 10.0.0.x subnet.

The 1st ethernet port (en0) of the Head node is used to connect to the outside world.

The XGrid Controller is being run on the Head node. The Rendezvous logic in XGrid does not appear to be finding the other compute nodes on the local 10.0.0.x subnet. I assume this is because the Head Node is only looking on the en0 port to the network outside, and not on the en1 port to the cluster subnet. Is this something that can be patched easily in XGrid?

If the XGrid Controller is run on a compute node which only sees the local subnet 10.0.0.x then the XGrid auto discovery works. However, this compute node is not directly visible to the outside world, so submitting jobs is more involved.

Yours, Rick Gaitskell
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