Port used in IPSec NAT traversal scenarios on the USG9000

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The initial port used in IKE negotiation is 500. After the NAT traversal capability detection and NAT gateway detection are complete, the UDP port for encapsulating ISAKMP messages is changed to 4500. The subsequent negotiation and data transmission use this port.

Other related questions:
Port used in IPSec NAT traversal scenarios on the USG2000
The initial port used in IKE negotiation is 500. After the NAT traversal capability detection and NAT gateway detection are complete, the UDP port for encapsulating ISAKMP messages is changed to 4500. The subsequent negotiation and data transmission use this port.

Which port is used in IPSec NAT traversal scenarios
The initial port used in IKE negotiation is 500. After the NAT traversal capability detection and NAT gateway detection are complete, the UDP port for encapsulating ISAKMP messages is changed to 4500. The subsequent negotiation and data transmission use this port.

Port used in IPSec NAT traversal scenarios on the USG6000
The initial port used in IKE negotiation is 500. After the NAT traversal capability detection and NAT gateway detection are complete, the UDP port for encapsulating ISAKMP messages is changed to 4500. The subsequent negotiation and data transmission use this port.

Port used in IPSec NAT traversal scenarios on the USG5000
The initial port used in IKE negotiation is 500. After the NAT traversal capability detection and NAT gateway detection are complete, the UDP port for encapsulating ISAKMP messages is changed to 4500. The subsequent negotiation and data transmission use this port.

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.

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