Solution for network monitoring

Hello, list!

I need your help in finding solution for network sniffing/monitoring
in large corporate networks. For a long period of time, we used
PacketSentry from PacketMotion company, but since it was bought by
VMware - they closed this product line.

The technical specification of the system must be something like this:
- work with SPAN ports;
- analyze level 7 traffic - web, smtp, smb/cifs, etc. The system must
provide information such as what user did on file server, what files
he opened/copied/edited
- have central managment

Thank you in advanced!

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