clojure friendly java library for traversing NAT

I need t开发者_运维百科o be able to establish a connection between two boxes that are both behind NAT? I have a central system that both sides can find each other through. I'm working in Clojure.

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If you are trying to do UDP, take a look at stun4j. Otherwise, I think you may need to roll your own code from scratch.

But it would help a lot if you provided more information about what you were trying to do.