Port used in firewall NAT traversal

Ports that shall be enabled when IPSec NAT traversal is used on the USG:
Destination UDP ports 500 and 4500. If no NAT device is deployed, use port 500. If any NAT device is deployed, use port 4500.
Port 51 for IP packets using the AH protocol and port 50 for IP packets using the ESP protocols.

Other related questions:
Firewall NAT traversal
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