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I've got a fairly basic network - internet router, wireless AP, Switch and a few
computers (my PC, my laptop, housemates laptop). I leave my wireless AP open so that
others can use it if they need to.
The other day I noticed some heavy usage on the router and discovered that someone
was connected and using a considerable bandwidth - some nmapping, arpspoofing and
wiresharking revealed three "unknown" MACs connected to the AP one of which I
believe was downloading a bittorrent.
I've no problem with people using my connection for a bit of browsing or downloading
email but as far as I'm concerned a large, high bandwidth bittorrent is abusing the
privilege so I blocked that MAC for 24 hours. Subsequently it hasn't resumed the
connection.
However I now think I ought to keep a tighter rein on things and want to monitor
usage of the network. Is there any way to keep a log of usage statistics per IP
address on a switched network? Ideally without having to use arpspoof and reroute
all network traffic through my PC.
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