About IP

So, i and my friend live in the Russia, and we have Russian IP, but diffrent internet providers a nd diffrent IP. When i'am registred in the CF and game started, I'am doesn't have something errors and problems.But when my friend was entered in the game, we seen message about our region blocking. When he change IP, after 5 minutes we take message about hacker tools detecting. I'm play at Canadian servers, because on our server a lot of non-adecvate schoolers and cheaters. Please, answer me, why he can't play, but I can, every of us have Russian IP.And, second question: can system made block my account from my region IP?
P.S. Sorry by my bad English.

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