I have a network setup at a church. We are running Windows Server 2003 with a Sonic Wall TZ170 router/firewall which is the DHCP server. All is configured properly and everything runs well until some genius decides to bring in their own router and plug it into the system. The basic problem is that they don't know the difference between a wireless access point which I wouldn't care about and a router. Once someone does this it creates havoc on the system and takes us hours to locate the device. How can I either block another router from going onto the network or at the very least easily detect and determine it's location? The simple answer is to tell everyone not to do such things but that has not worked.