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Can anyone please tell me how can I measure the network data. For example, my office wifi is used by me and 5 of my employees. Can I check the amount of data being downloaded from individual PC?

Thank you for your time.

Regards

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that is not you can do with a regular cheap wifi router. However some routers have SNMP - simple network management protocol implemented. You can access such router on a specific port and get some data like statistical usage of bandwith and so on. – mnmnc Dec 22 '12 at 23:34
    
You could do this with iftop if your router would be on Linux. You did not specified what kind of router you have... – mnmnc Dec 22 '12 at 23:40
    
@mnmnc Thank you for your reply. I am using Beetel 450 TC1 ADSL2+ Router. I have installed iftop but it gave me the following error : eth2: You don't have permission to capture on that device. – Mohit Madan Dec 23 '12 at 22:02

Practical would be a Switch/WLAN Device which does Support Netflow.
No a snorkeling tool. Imo neither uncritical in regard to privacy.

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I am using Beetel 450TC1 ADSL 2+ router. This is installed at my office. I googled and I can see that it does support Netflow, but can you please tell me an open source solution to it? – Mohit Madan Dec 23 '12 at 22:06

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