Forward error correction (FEC) is a method
of correcting certain data transmission errors that occur over noisy
communication lines, thereby improving data reliability without
requiring retransmission. FEC is helpful for applications that are
sensitive to packet loss or corruption, such as audio, VoIP, and
video conferencing. With FEC, the receiving firewall can recover
lost or corrupted packets by employing parity bits that the sending
encoder embeds in an application flow. Repairing the flow avoids
the need for SD-WAN data to fail over to another path or for TCP
to resend packets. FEC can also help with UDP applications by recovering
the lost or corrupt packets, since UDP does not retransmit packets.
Create an Error Correction Profile,
which specifies the packet loss threshold, the packet loss correction
ratio, and the recovery duration that the profile applies to applications
in the SD-WAN policy rule.