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Take Control of Screen Sharing in Snow Leopard by Glenn Fleishman

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Use Manual Port Mapping

Manual port mapping, also called port forwarding, requires that you enter a fair amount of seemingly arcane information in your router's settings to get a computer on your local network to be receptive to incoming traffic from the greater Internet. With respect to screen sharing, you use port mapping in two cases:

  • For any screen-sharing solution, including Mac OS X's built-in Screen Sharing service and screen sharing over iChat, if your router doesn't support automatic port mapping (as noted in Which Kind of Configuration?, earlier in this section).

  • For screen sharing with a direct connection.

Because all of Apple's services have fixed ports for remote access, if you use manual port mapping, you can run a given service on ...

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