With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cnatStatsGroup
cnat Stats Group
1.3.6.1.4.1.9.10.77.3.2.3
A collection of NAT statistics related objects required to support troubleshooting/monitoring NAT operation.
Back to CISCO-IETF-NAT-MIB MIB page.
IPHost Network monitor allows you to monitor cnatStatsGroup on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco optical switches right now.