The Netwatch description is totally false.
quoted from http://www.linux.org/
Netwatch allows a user to monitor an Ethernet segment or PPP line and examine activity on the network. Hostnames are highlighted in colours to indicate activity on the bus network based on time. The monitor includes statistics on transmitted and received packets, transmitted and received bytes, protocol of last packet (TX or RC), last communication partner (IP address) and Logging entire stats to an ASCII file. There is a TOP mode which allows a sorted list of hosts based on IP usage. All info is updated on a per second basis.
and it works under Linux. Not Windows.