Netflow is not supported in CiscoPIX but syslog is. If you want to analyze the traffic that is going through firewall, you can use firewall log analyzers.
Some of the most extensive NetFlow (NSEL) support for the ASA is found in Scrutinizer. It can break down the flows by template, category, etc. It can also report on denied flows and provide the ACLs seeing the most matches.
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