Citation :
If you are looking to use your Windows XP box as a router, one of the first things you will need to do is enable IP forwarding. Previously, NT and 2000 provided a checkbox in your network settings GUI to easily turn routing on, but with XP it's no longer an easy-to-toggle checkbox. But, given the following registry edit, you'll be on your way to routing packets from one network to another. Set this key to one to enable routing, or zero to disable (disabled is the default):
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\IPEnableRouter
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