With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
natInterfaceDiscards
nat Interface Discards
1.3.6.1.2.1.123.1.3.1.5
Number of packets that had to be rejected/dropped due to a lack of resources for this interface. Discontinuities in the value of this counter can occur at reinitialization of the management system and at other times as indicated by the value of ifCounterDiscontinuityTime on the relevant interface.
Back to NAT-MIB MIB page.
IPHost Network monitor allows you to monitor natInterfaceDiscards on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.
