.  

--Last edited by mattmac on 2008-06-22 14:09:58 --

You can't ban IP's, but make sure that you only accept new members manually. This can be altered in the Admin panel. When someone new registers, a message appears on the front page of the forum which is only visible to the administrator. You can then look at the details of the new member and check for multinicks. This detects someone using the same computer before they can get into your forum, and you can then ban them immediately.