I meant that the random selection idea would select the port for a cluster of nodes, 
not just a particular node, but it would have to exist at a "cluster" startup level 
not a "node" startup level.

If I utilized ${system property name} replacement in the file, and then passed the 
same port for a multicast configuration to the VM as a system property for every node 
in the cluster, it seems to me it would work.  Currently, we are doing that for the 
cluster partition name, but you are right, I have include that substitution in several 
different places.  The port number would be a single substitution in a single file.

Does the cited example in UDP.java easily map to multicast configurations too, so I 
could test random or hash-selected cluster multicast port numbers for listeners?

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http://www.jboss.org/index.html?module=bb&op=viewtopic&p=3840560#3840560

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