With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cnatConfDynGlobalPortFrom
cnat Config Dyn Global Port From
1.3.6.1.4.1.9.10.77.1.1.3.1.9
If this conceptual row describes a basic NAT, then the value of this object is '0'. If this conceptual row describes NAPT, then the value of this object specifies the first port number in the range of ports being mapped to. If the translation specifies a single port, then the value of this object is equal to the value of cnatConfDynGlobalPortTo.
Back to CISCO-IETF-NAT-MIB MIB page.
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