iftop: iftop 1.0pre4 (display bandwidth usage on an interface)  
iftop:  
iftop: iftop does for network usage what top does for CPU usage.
iftop: It listens to network traffic on a named interface and displays
iftop: a table of current bandwidth usage by pairs of hosts.
iftop: 
iftop: http://www.ex-parrot.com/pdw/iftop/
iftop: 
iftop: 
iftop: 
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