NAT and NetFlow

Document ID : KB000022906
Last Modified Date : 14/02/2018
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Issue/Problem/Symptoms:

On a router running Network Address Translation (NAT), NFA does not show private addresses on an Interface. It only shows the translated public IP address.

Environment:

NFA and Cisco NetFlow.

Cause:

NAT and NetFlow configuration.

Resolution/Workaround:

NFA is designed to report based on what it receives from the NetFlow Packets. Upgrading the router to Cisco's release of NetFlow Egress on IOS 12.3(11)T provides post-NAT NetFlow statistics, giving accurate NetFlow data for NAT traffic.

Additional Information:

Cisco IOS NetFlow