Port used in IPSec NAT traversal scenarios on the USG2000

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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:
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 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.

Configuring IPSec NAT traversal on the USG
Run the nat traversal command on the IKE peers at the two sides of the gateway to implement IPSec NAT traversal.

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