view Internet connections from/to to an IP address of PC in company network

view Internet connections from/to to an IP address of PC in company network

I wonder any software can help to monitor Internet connection sessions between the router connected to Internet and the PC in the LAN. I means which PC made the Internet connection and what type of connection (such as ftp, down files, VOIP phone calls etc). We run out of Internet connection resource, before I upgrade my Internet bandwidth, I want to identify which PC make the most connections and what type of traffice it is.
 
Raphael

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