Port used in IPSec NAT traversal scenarios on the USG5000

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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 USG9000
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 number used by the USG for NAT traversal
The USG firewalls use open port numbers for IPSec NAT traversal. UDP packets with destination port set to 500 or 4500. If no NAT device exists, the port number is set to 500; if the NAT device exists, the port number is set to 4500. IP packets using the AH (port number set to 51) or ESP (port number set to 50).

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