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mle2802
Staff
mle2802
Staff
April 3, 2025

Troubleshooting Tip: Packet duplication on-demand in SD-WAN is not working

  • April 3, 2025
  • 0 replies
  • 586 views
Description This article describes how to troubleshoot when packet is not duplicated when SD-WAN packet duplication is set to 'on-demand'.
Scope FortiGate.
Solution

From the SD-WAN configuration, verify packet duplication is configured according to Duplication on-demand when SLAs in the configured service are matched | FortiGate / FortiOS 7.2.0 | Fortinet Document Library.

 
 

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However, when testing using ICMP protocol, traffic is sent via only 1 VPN tunnel instead of both tunnels configured in SD-WAN.


Screenshot 2025-03-31 174811.png
To trigger packet duplication on-demand, all members must be out of SLA. If one member is out of SLA and the other is in SLA, packet duplication will not trigger if it is configured as on-demand.

 

Screenshot 2025-03-31 175106.png

 
After confirming all members are out of SLA, generate traffic again and confirm packet duplication is triggered.

Screenshot 2025-03-31 175352.png
Screenshot 2025-03-31 175658.png
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