With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
natSessionCurrentIdleTime
nat Session Current Idle Time
1.3.6.1.2.1.123.1.9.1.21
The time since a packet belonging to this session was last detected.
Back to NAT-MIB MIB page.
IPHost Network monitor allows you to monitor natSessionCurrentIdleTime on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.
