IP Forwarding on windows OS machine

is it possible to configure windows machine to do IP Forwarding . if yes could someone explain how or point to some material on the interne开发者_JAVA技巧t which explain how to do this .

also if there are some WIN32 API which help with this ?

For windows XP: http://support.microsoft.com/kb/315236

You have not really mentioned a language you would like to use, so I'm just going to point you to a generic way to set up IP Forwarding (which involves editing the registry) right here. You can easily edit the registry in C# (I'll assume you're using it), you can see it right here.

And, for C++/C: you can see this, this and this.