knowing which system generating more traffic in a lan with internet

[dinakar]

Hi , I wamt to know which system generating more traffic in a lan with internet access.
We have 256 kbps leased line & laesed line line modem , local made router with 100 systems , how to know the most traffic generated / most data downloaded system .

pls help me

[juniper]

depends on the router. with cisco you could use netflow for instance. If you can SPAN the uplink port to a sniffer like Observer it will graph the traffic patterns also. or use a proxy server.