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Basic information for such a setup is available on the ROS Wiki. Take a look at setting up multiple machines at http://www.ros.org/wiki/ROS/Tutorials/MultipleMachines. As long as you have persistent connectivity over your network, using one master should work fine.

If you need to run too many nodes across this one master, and notice problems launching new nodes, then you might have to use a multimaster setup. With persistent connectivity, the current multimaster stack should work well enough.