Computer ip on DHCP?

So I left a P2P program open and exheeded the college network's daily upload limit.  Now I'm off the net for awhile. I'm guessing if I can change my computer's ip number, then it'll recognize my PC as another and I'm back in business. How do I do it? I've tried:

ipconfig /release
ipconfig /renew

at the command prompt, but no dice. Anything else I need to try?

Also, network settings may or may not be locked out from me... but where do I go to see if it is or isn't?

Uh, yeah, but that's layer 3. It has nothing to do with ethernet. You can use IPv6 all you want, but it won't have any effect on MAC address clashes. Same applies for IPv4. So I don't quite get what you're saying.