SD-WAN supports packet duplication as a method
of error correction and an alternative to Forward Error Correction
(FEC). Packet duplication is helpful for applications that are sensitive
to packet loss or corruption, such as audio, VoIP, and video conferencing.
Packet duplication performs a complete duplication of an application
session from one tunnel to a second tunnel. Packet duplication requires
more resources than FEC and should be used only for critical applications
that have low tolerance for dropped packets.