iftop 1.0 Pre4 Description:
iftop is an open source and totally free command-line software designed to display network traffic usage on your Linux-based operating system. It does exactly what the top utility does for CPU usage under any GNU/Linux operating system. This program is usually used by system administrators or end-users who want to see why their network connection is so slow. It works by listening to the network traffic on a specified interface and displays real-time bandwidth usage information, listed in a table sorted by pairs of hosts. Various command-line options are available for iftop, which can be viewed at a glance by running the ‘iftop --help’ command in the terminal emulator. Its options are organized in three main categories: General options, Sorting orders and options that are only available in combination with the -t option.