Changing ip packages (sourse Addr,ports and checksum)

I am trying to write a little NAT service, and i need to change ip packets. (The source address, source port, and the checksum of the packet.)

Where/how do i do it? In winsock.h (mayby il do it in linux... dont know yeat). Is it done in/with Tcp/ip using sockets?

What sould i read or buy?

Pleas healp one whery cold Icelander

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