If you’re wondering what UDP port is used for IKE traffic from VPN clients to servers, you’re in the right place. Keep reading to find out.
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Introduction
IKE uses UDP port 500 for phase 1 traffic and UDP port 4500 for phase 2 traffic. IKEv2 uses UDP port 500 for both phase 1 and phase 2 traffic.
UDP Port Number
The UDP port number used for IKE traffic from VPN Client to Server is 500.
IKE Traffic
UDP port 500 is used for IKE traffic.
VPN Client
UDP 500 is the default port used by IKE (Internet Key Exchange) for VPN traffic from a VPN client to server.
Server
IKE uses UDP port 500 for ISAKMP phase 1 traffic from VPN Client to Server and IPSecNAT-T traffic from VPN Client to Server.
Conclusion
IKE traffic uses UDP port 500.