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Finding Torrent Downloader

Our company received a letter from legal firm representing a medial compnay which was forwaed to us by out ISP. It seems someone in out LAN has been downloading copyright protected materials and has exposed our business to copyright infringment liability. Management is very interested in finding the computer/user responsible. What is the best way to do this without having to inspecte more than 70 computers.We use a Netgear RVS318 Router/Firewall
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biztekadmin
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biztekadmin
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Ernie BeekExpertCommented:
You could use wireshark and see who is torrenting. You are sure they used torrents for that?
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biztekadminSystems AdministratorAuthor Commented:
I'm assuming a torrent downloader was used becasue I've had previous expiereince in a smaller environment, where someone left a Vuze instance downloading/seeding all weekend, by Friday of the next week we recieved a warning letter from out ISP. What other services / applications should Ibe looking for? As far as Wireshark, any suggestions on how to configure which network traffic to capture to determine who is downloading. Also will wireshark impact network performance? Thank You.
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Ernie BeekExpertCommented:
This should help you with wireshark: http://wiki.wireshark.org/BitTorrent

Wireshark shouldn't have an impact on performance, it just listens (to everything on the network).

Though torrent are widely used, you might also want to look at (for example) usenet traffic. That uses port 119 by default or port 563 for SSL connections.
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biztekadminSystems AdministratorAuthor Commented:
Thank you really apreciate the help.
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Ernie BeekExpertCommented:
No problem, always glad to help :)
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