With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cnatAddrBindDirection
cnat Address Bind Direction
1.3.6.1.4.1.9.10.77.1.2.2.1.4
This object represents the direction of the BIND. A BIND may be either uni-directional or bi-directional, same as the orientation of the address map, based on which this bind is formed. The direction of this bind is with reference to the private realm.
Back to CISCO-IETF-NAT-MIB MIB page.
IPHost Network monitor allows you to monitor cnatAddrBindDirection 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.