We've got problems on the Two Wheels forum with a bloke who keeps registering and causing problems. His IP address has been blocked but he works around it. Dunno how.
I must admit I haven't really looked into anonymisers.
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One way that used to work and still can on some BIG Isp is with 2 lines and modems, set up one as a static Ip and when you know what Ip has been banned tell it to take the banned Ip address then dial in with the Get IP from host setting turned on. Bingo you get the next IP address.
Some modems used to be configurable so that they would not negotiate past a certain point unless they had been assigned IP addresses other than the ones stored in a list OR assigned and IP adress in a certain range.
Its how I used to do it when I cared about that kind of stuff..
anoter newer one that Might work is if hes on wireless internet, once you change cells you change if you reset the connection.