iftop

display bandwidth usage on an interface

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  1. Package version
    iftop-1.0pre4p4
  2. Maintainer
    The OpenBSD ports mailing-list

iftop does for network usage what top(1) does for CPU usage. It listens
to network traffic on a named interface and displays a table of current
bandwidth usage by pairs of hosts. Handy for answering the question "why
is our ADSL link so slow?"