IP spoofing.....possible? how? to which extent?

Hi everybody!
Thanks for your time in advance. Is IP spoofing possible in JAVA? If so how....can somebody give me a scenario? Also please let me know in detail that can i also hide the IP of my ISP or hosting server(i.e. where the application resides & executes)....
I'll appreciate each & every detail. But i don't want to have answer of 1 or 2 lines please on this forum. If you really want to help me then do it in detail.
Have a nice time.
Attiq.

This URL might help you: http://www.goto.info.waseda.ac.jp/~fujii/jpcap/index.html
It is java wrapper roung standart unix library libcap - it allow programmers to write spoofed packets. Using this library you bypass tcp stack and you are responsible for creating valid ARP, IP ... TCP or UDP headers.
Actually spoofing is just rewriting of ip headers with another - not valid IP. But if you send such packet you will not receive ANY reply - so actually you can't do real communication with spoofed packets.
You may look at some security forums for more details.

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