second ip after login

I notice that my users get a Second IP address after they login successfully. The IP is coming from the same pool that I give the user when they first connect to my wireless network. How do I prevent them from getting a second IP.

Should I simply remove the pool from user profile in hotspot?

Thanks,
Dave

Remove the pool from the user profile, from the Hotspot server itself, and remove all address references from the user and user profile.