Ban user question
 

Besides banning a user by entering the users name in the Ban user area of the admin panel, can I ban a user by another method. I have noticed that some banned users on my forum eventually make it back in with a new user name & email address. When I ban a user it is permanent. I've had one person make it back in two times. Can I do it with an IP address? Where do I find that kind of info on a person. I tried it one time & could not get the ban to work.
Thanks
Greenthing