Thread:Project:Support desk/Banning a troll who changes his IP address/reply

First off, if you have problems with vandals who keep coming back I'd recommend installing the checkuser extension. That allows you to view a user's IPs, and which accounts are linked to an IP.

Vandals and trolls who come back with different IP addresses can do so with relative ease, through two major ways. The first is rotating through IPs in a "range", which can be done a variety of different ways. These are easy to deal with since you can block a range of IPs (see here, and use a rangeblock calculator found here). The second way is the use of an open proxy, which is a lot harder to stop since there are a lot of them out there and they are not usually part of a range. In cases of very bad vandalism with proxies, you could disable anonymous editing and account creation temporarily.