I've this situation: 1 pc running windows xp pro with 2 nics, one connected to the wan, the other connected via a crossover cable to another pc. I want to redirect all incoming trafic from the wan to the "private" pc (the one non directly connected to the one) except for few tcp ports (http, https and so) which traffic will be served directly by the machine with 2 nics. Moreover the "private" machine has to access one, and only one, ip address placed on the wan. How can I do?

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This question belongs on superuser.com - it seems off-topic here. I'll vote for migration. – syneticon-dj Jan 23 at 0:25
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Here is a article showing how to set an XP box up as a router http://www.home-network-help.com/ip-forwarding.html

However this won't automatically forward everything to the client PC.

Been a while since I poked around with XP's firewall and I haven't got an XP box handy to check, but you should be able to use the firewall to restrict access to one IP.

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