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Knowledge Base

FAQ-Which port is used in IPSec NAT traversal scenarios

Publication Date:  2015-07-01  |   Views:  775  |   Downloads:  0  |   Document ID:  EKB1000081293

Contents

Issue Description

Which port is used in IPSec NAT traversal scenarios?

Solution

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.