Package darkstat

Network traffic analyzer

http://unix4lyfe.org/darkstat/

darkstat is a network traffic analyzer. It's basically a packet sniffer
which runs as a background process on a cable/DSL router and gathers
all sorts of useless but interesting statistics.

System Administration (Section 8)
darkstat
darkstat is a packet sniffer that runs as a background process, gathers all sorts of statistics about network usage, and serves them over HTTP. All settings are...