I am trying to ban someone from my message board (bravenet) but they keep coming back and telling me I can't do anything about it.
Is there a way for me to either ban them without regard to their IP, or at least be able to recognize their posts so that I can ban their new IP address, even if they change names?
Not on a Bravenet board, they are very simplistic. All you can do is quietly delete each post and wait for him to get bored and go back to writing on toilet walls.
There is no way to do what you want on ANY board, not just Bravenet boards.
IP addresses can be changed/spoofed very easily. Anyone using a dialup connection is using a dynamic IP which changes slightly everytime they logon to their web connection.
The solution you are really looking for, is to either not annoy people on your forum, or opt for a board that requires registration with an email address and password and manual approval before a user can post.