Hi All My gateway IP address of my network card changes all by itself. I set the NICs IP info manually. This is what it looks like IP address : 172.31.1.241 Subnet : 255.255.255.0 Gateway : 172.31.1.254 The gateway IP changes to 172.31.1.252 or it changes to nothing(empty field) all on it own, no intervention. What the hell is going on? The PC is Windows XP SP2 and is connected to a Cisco 3750 switch. Help!