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FAQ-Which port is used in IPSec NAT traversal scenarios

Publication Date:  2015-07-01 Views:  323 Downloads:  0
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.

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