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addresses and if your private network numbering doesn't overlap, you
should be okay with appropriate additions to the host and routing
tables. For instance, have one private network as 10.0.1.x and the other
as 10.0.2.x and then just setup routes correctly.

There are efficiency issues with the routing through other boxes to get
to nodes, but that is more or less of a problem based on what you are
actually doing. Some domains have real locality issues, like molecular
dynamics, which going off the local network would wreak havoc on. Also,
depending on what you are doing, filesystems issues may have to be
worked on a bit too, as your filesystems may be setup very local
cluster-centric and access to home directories and such will be
problematic.

	-Dean