freebsd-ports/net-mgmt/iftop/pkg-descr

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