IP randomizer

Forums 

does an IP randomizer actually work?
i ask this because i banned this dude from our clan server and yet he still came back. please tell me what can i do to prevent this from happenig again?
~Boba

well, for the people that use dial-up, their ip changes everytime they connect to the internet, which makes it a little difficult to ban, but i have an ip changer, and yes, it does work.