few questions on packet sniffer/analyzer

Posted by user37652 on Server Fault See other posts from Server Fault or by user37652
Published on 2010-05-22T03:02:42Z Indexed on 2010/05/22 3:11 UTC
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modem

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packet-analyzer

I have few questions about packet sniffer. I'm using a zyxel p-600 series modem and a hub to distribute the internet connection.

Can I use a packet sniffer here to determine if the user is downloading something?
Can I determine if the user is downloading a file based on the modem alone.(The lights blink faster)
Is there an application that I could use for the modem or the hub to limit or avoid direct downloads.

Details:

OS: Ubuntu 9.10 and Windows 7

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