Quickly see which computers on your LAN segment are eating up your bandwidth and sending out large amounts of ARP and ICMP packets. These computers are probing your network and are most probably infected with viruses such as MBlaster and Welchia. ZNetWatch is a free and simple to use program for MS Windows 2000/XP that will help you identify these computers.

ZNetWatch is a free program that I developed to help our University detect the hundreds of computers that were hit by the MBlaster and Welchia viruses. Start up the program, and (if there are infected computers on your LAN) within seconds, the infected computers will pop up to the top of the list and turn red.