In addition to the many other routes suggested above, it might be simplest/easiest/whatever to just write a tiny socket program that sits on the firewall/gateway that listens for requests from inside, passes it to the outside and then returns it. You can find an extremely simple one in the Cookbook (socket section).

In reply to Re: Sending a Signal to a computer inside an intranet by BUU
in thread Sending a Signal to a computer inside an intranet by cavalive

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