I'm worry, that you are not able to do a user monitoring on this kind of device. A SNMP gives you information about interface utilisation, but no user regarding information... Could you use any netflow capable switch before/after PIX? It is the first solution. But you lost information about real source user due to NAT. The another one solution is to use two switches (or a transparent netflow probes), the first one on ISP side and the second one in your internal network...
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