Monitoring network traffic

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Office 10 computers. Sometimes, the network and the Internet starts to brake terribly. Suspect that someone includes a torrent, or who have a virus clogging the entire channel. You need to put all the program of monitoring network traffic that the results of their work outputs in publicly accessible place and be sure that it shows that this computer program is not launched. For example, someone intentionally knocked her to shake.
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The network is distributed over Wi-fi ADSL router ASUS DSL-N13.
All the computers Win.
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In General, in this case, I would probably put on all of them some sort of firewall as well) will not allow the viruses to batter the network b) will keep statistics on network activity) to some like there is a web face on which you can remotely check the logs if it is running, etc. d) those who give up voluntarily to put bandwidth limits on torrents to go remotely on the firewall and Bloch applications for torrents.
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Stick to your normal perepisyvaemym ASUS ASUS WL-500gpv2 (or Dlink DIR-320), plug in his flash drive and reboot. Configure iptables for traffic accounting, IP the give out computers based on MAC address, configure filter by known mac addresses and the problem with traffic will be resolved. Then experiences perekvalifitsiruetsya into UNIX admins ;)
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alternatively, if the switch is "smart", you can analyze traffic in the peak and determine the problem
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Smart solution — netflow. Supported iron routers and liftovye.
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But why a bike? You can also serority traffic by using switch or if the switch does not support this feature, using the ancient hub on the machine running wireshark and see what and where goes.
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