Thank you. I should have mentioned that it is within a VPN. However, one of the Glassfish instances will be in a sub-domain. I will need to consult with the network administrators since I don't know enough.
Also, what the traffic volume, and what sort of messages are in the traffic, that's being generated between the Glassfish servers? When I make a request to a servlet in the cluster, how is my request routed?
One of the things I'd like know beyond whether it is technically possible is, is Glassfish clustering across a VPN a tested and good configuration, or is it experimental?
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