please help not allow the many connections from single user

Hi We has big problem to have many connections from single user in DSL clients A single user can authenticate on the different LNS server to use the internet connection. how can we prevent it? As our users are using the dynamic ip, the ip address is assigned by the LNS not the radius in this case, the ip pool can't be defined in the radius setting. Right? Can you help to give us detail info? thank you so much ____________________________________________________________________________________ Be a better pen pal. Text or chat with friends inside Yahoo! Mail. See how. http://overview.mail.yahoo.com/