how can I monitor in my network ?which system using how many bandwidth and downloading etc....

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closed as not a real question by Ward, rkthkr, John Gardeniers, Massimo, splattne Apr 19 '10 at 10:51

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3 Answers

you can use for instance bandwidthd or ntop. both can be installed 'in-line' - at the linux router - or can listen to traffic mirrored by a managed switch.

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It all depends on architecture of your network

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depending on your gear try SFLOW.

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