A mate has made a MAC bridge and is reporting that the MAC address has change in the computers on the secondary network being 3 as well as the computer that has the bridge . I know the MAC address is suppose to change on the computer that the bridge is on but not any other computer. iv done this many times and the only problems that may occur is a domain alteration and only on the computer the bridge is from. What could cause the MAC addresses to change on the three computers. I was thinking a virus as the bridge put the computers online but other than that Iím stumped.