We have a LAN with two 2WIRE Internet routers. On this LAN we have about 200 PC's with Windows XP. To give somebody Internet access, we configure with a static IP and use the router IP address like an Internet access gate.

My problem is that I need to monitor and lock advanced users who try to violate my locks. Do you know about some software that can tell me who is using my router to access the Internet? And if so, lock him?