I need to monitor the sessions handled by PIX/ASA units running release 7.2. I need statistics like how many SYN packets were sent from clients to servers protected by the PIX/ASA; how many of these SYN received the SYN/ACK; how many sessions reached the established state. I saw that there is the "show counters" command but all these statistics are related with traffic sent to the PIX/ASA itself, not traffic passing through the unit. The upgrade to 8.x is not an option in the moment. SNMP was investigated as an option but there only a few interesting values under the CISCO-FIREWALL-MIB and CISCO-UNIFIED-FIREWALL-MIB.