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It works for a temporary ban, but I am not too sure about permanent bans. It should work though. I am not the founder of the bypass. You must have a wired connection and also bridge the connections of your ps3 and computer together.
1. Make sure that your Xbox & PC are both wired up to the same Modem.
2. Download You must login or register to view this content..
3. Unplug your ethernet cable from your PC.
4. Now, Turn on 'Sniffer and Arp Poisoning' on Cain and Abel.
5. Then, Start up black ops.
6. Now note down the IP address that pops up when the game loads.
7. Specify that IP in the Arp Poisoning section of Cain and Abel.
8. Let it run for a minute, then connect to multiplayer on Black Ops.
9. You will get an error that you are banned.
10. Log in again quickly, and you should be back onto the server.
11. After you are online stop Cain and Abel.
[ame]
https://www.youtube.com/watch?v=uLS9-bCiizY&feature=player_embedded[/ame]
Please don't flame me before trying this out. I have tested this out myself and it worked.