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Welcome to the world of Networking.
If you use a Cisco router on your network, you can use something called NetFlow to do what you want.
Just do a search in the Orion forum for Netflow & you will find several discussions & products mentioned that can do this for you.
Otherwise you can use a Sniffer to see the traffic on your network in realtime, but you won't be able to view historical sniffer data.
There is a free Sniffer application called Ethereal which is very good for this.