Hello welcome to GeeksToGo
My name is Cbarnard. I will try to answer your question for you
This problem you are seeing is not a problem at all.
Every time you connect to the net you are given an IP address "on lease"
Lets use for example you have a wireless router that can handle 50 users
Each user when they connect receive a lease on an IP address, the router assigns the address to them for the specified period of time. When the time runs out when the connect again they are reissued a new address Typically the IP address will start at 192.168.1.1, The next address it issues will be 192.168.1.2 and so on.
I hope this has helped you If you have anymore questions I would love to help you with them.
Edited by cbarnard, 13 April 2009 - 12:21 PM.