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Mike,
You can ask if your ISP does static addresses. Mine does, and it is one of the reasons I chose it.
Tell your router to always allocate the same IP to your son's computer - it will do that by MAC address. Then you add the port forwarding rules for the game's ports to his PC. If the game lets you change the ports it uses, you could alter them to something unusual so people port scanning are less likely fo find it.
And any time you open ports through your router you provide a potential for cracker access. Keep every computer's antivirus up to date.
Andrew
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