One of our users has a laptop that she uses at home and the office. Yesterday she couldn't get on the office domain, and she had the wrong IP address (it was in the 192.x.x.x range, so I assume she got this from her DSL router at home). I did ipconfig /release, then ipconfig /renew and she got the right IP address and everything was fine. Then it did it again today; she had not taken the laptop home, she kept it booted up and logged out all night. I did release/renew again and fixed it, but why does it keep getting the wrong IP address for our domain, and why is it not releasing it when she logs on here?