1 iftop listens to network traffic on a named interface, or
2 on the first interface it can find which looks like an
3 external interface if none is specified, and displays a
4 table of current bandwidth usage by pairs of hosts. iftop
5 must be run with sufficient permissions to monitor all
6 network traffic on the interface; see pcap(3) for more
7 information, but on most systems this means that it must
10 WWW: http://www.ex-parrot.com/~pdw/iftop/