If you have any issues with the network telemetry export you can use the built-in TCP dump tool as part of the debugging option on the LoadMaster to validate data is exported towards the collector. To perform a TCP dump using the LoadMaster, follow the steps below:

  1. In the main menu, go to System Configuration > Troubleshooting.
  2. In the TCP dump section, enter the Collector IP address in the Address text box.
  3. Click Start.
  4. Click Stop to stop the TCP dump.
  5. Click Download to download the .pcap file.

Ensure that there is no specific network configuration such as a firewall or access control list that is preventing the data from reaching the export target.

You can also troubleshoot from the Collector side. Log into the Flowmon Collector using SSH and run tcpdump to check if flow data is reaching the Collector interface.

For detailed information related to TCP dump, refer to the Packet Trace Guide Technical Note.