Need Source code or atleast how to implement Controlling IP spoofing through inter domain packet filters?

now i am doing my final year project. as am doing it internally i dont know clearly what to do and how to do it. if anyone got the sourcecode for this project pls do forward to my mail id. atleast post alink where the source code is available. thanks in advanceNeed Source code or atleast how to implement Controlling IP spoofing through inter domain packet filters?try using nmap