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Home > Success Center > Netflow Traffic Analyzer (NTA) > NTA - Knowledgebase Articles > Cisco IPSEC VPN tunnels do not show Netflow data

Cisco IPSEC VPN tunnels do not show Netflow data

Created by Joseph Esquitin, last modified by MindTouch on Jun 23, 2016

Views: 2,006 Votes: 0 Revisions: 4

Overview

This article provides brief information and steps to resolve the following error;

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Cisco devices are configured with logical IPSEC VPN tunnel interfaces, and Netflow is enabled on these interfaces. Drilling these interfaces show the error. 

Note: This does not apply to Cisco ASA VPN tunnels

 

Environment

  • All NTA versions
  • Cisco IOS versions that support IPSEC VPN tunnels

 

Cause 

The issue is caused by a configuration on the device.  When collecting Netflow from IPSEC tunnels, Flexible Netflow is required.

 

Resolution

This configuration does not apply to Cisco ASA firewalls

  1. Verify device is using Flexible Netflow configuration. 
    Note: If standard Netflow configuration is used,  reconfigure the device to use Flexible Netflow.
  2. Enable the VPN tunnel interfaces to use Flexible Netflow.

 

 

 

 

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