Xen users - Dec 2005 - subnet crossing multiple machines - a typical use I think, but can''t work

Hi,
As titled, the scenario is:
1. Three machines A (130.x.x.15), B (130.x.x.16), C(130.x.x.17) within a
same subnet running Xen.
2. On each of them, there is one guest domain as configured as below:
left_node : Dom1 on A: eth0 10.15.0.2
central_node: Dom1 on B: eth0 10.15.0.1, eth1 10.16.0.1
right_node: Dom1 on C: eth0 10.16.0.2.

The target is: I hope to point left-node''s gw to eth0 on central node,
and point right-node''s gw to eth1 on central_node; therefore the
central_node acts as a router, through which left-node and right-node
can ping each other.(Furthermore, left, and right node will be replaced
by a cloud.)

I have tried configuring everything on one physical machine by creating
3 domains, and it works. But when across three physical machines, it
fails. (by adding an extra routing entry, "vertically " each internal
IP
address can ping the underlying public IP address.)

I have tried both bridging and routing. I guess it should be a practical
scenario; but I might miss a big point. Do I need to configure NAT or
ipchains? Could anyone point me some direction? Please, any help is very
much appreciated!
Zhan

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