When configuring a VPN, you’ll need to know what UDP port is used for IKE traffic from the VPN client to the server. In this post, we’ll explain what that is and how to find out.
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Introduction
The Internet Key Exchange (IKE) is the key management protocol used to set up a security association (SA) in the Internet Protocol Security (IPsec) protocol suite. IKE uses UDP port 500 and is supported by most IPsec-compliant devices, making it one of the most popular protocols for VPNs.
UDP port 500
UDP port 500 is used for IKE traffic from VPN client to server.
UDP port 4500
IKE uses UDP port 4500.
Conclusion
In conclusion, UDP port 500 is used for IKE traffic from VPN client to server.