Port 500

Q: What is port 500?

IPsec VPN key negotiation (IKE / IKEv2) UDP port 500 is used by IKE (Internet Key Exchange) to negotiate IPsec security associations and establish VPN tunnels. IPsec powers site-to-site VPNs (router-to-router) and the L2TP/IPsec and IKEv2 client protocols. It is used by Cisco, Juniper, pfSense, and the built-in VPN client on Windows. Together with UDP 4500 (NAT traversal), these are the two core ports required for IPsec VPN operation.

IKE

IPsec VPN key negotiation (IKE / IKEv2)

Port

500

Protocol

UDP

Service

IKE

Security

Safe

Full name: Internet Key Exchange (IPsec)

What is port 500?

UDP port 500 is used by IKE (Internet Key Exchange) to negotiate IPsec security associations and establish VPN tunnels. IPsec powers site-to-site VPNs (router-to-router) and the L2TP/IPsec and IKEv2 client protocols. It is used by Cisco, Juniper, pfSense, and the built-in VPN client on Windows. Together with UDP 4500 (NAT traversal), these are the two core ports required for IPsec VPN operation.

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