Utility/Sniffer to track internet traffic/speed of all PCs in local network

Question

It doesn't matter if utility is for Ubuntu or for Windows XP/7, just need to see what pc is using the most traffic in local network.

Probably some spammer etc on that pc.

Need to get rid of that, before calling to my ISP.

Thanks ;)

Answer 1

With a managed switch you can set a port to monitor traffic through the switch. Connect a PC to that port and run something like ntop or etherape on that PC

See How can I monitor internet usage in my network?

Answer 2

Try these first:

• Do you have access to the switch? Just have a look on the switch panel.
• Do you have access to the router? Take a look at the log/adjust loglevels

Mind you packet sniffing can be risky business, and it may or may not be legal for your situation. It is fairly unlikely you would be detected but you need careful firewlling.

To start with I guess you can start from Wireshark http://sourceforge.net/projects/wireshark/files/