Is it possible to spoof your internal IP address on a network so that the machine you're making connections with thinks that you're someone else? Combining this with a MAC address spoof, you could basically impose as another computer on the network, allowing you to do all kinds of things without the other machine knowing any wiser. I realize that with tools like Nmap, you can actually use a flag to spoof your IP address when scanning another machine (which is seriously useful), but is there a way to do it for your whole machine and not just for the use of Nmap?
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What you're probably looking for is ARP Spoofing.
Oh FYI, to assign a static IP on a UNIX variant (OSX/*BSD/Linux) you type:
Fuck knows how you do it on Windows. Check Google for some (RSI inducing) guides.