🌐 Networking

IPsec

A suite of protocols that authenticates and encrypts IP traffic at the network layer, used for site-to-site tunnels between gateways and for many remote-access VPNs. IKE handles the negotiation; ESP carries the protected packets.

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How to Lock Down IKE and IPsec Ports to Known VPN Peers

Site-to-site VPN peers have known addresses, yet most firewalls accept IKE from the whole internet. Here is how to replace implied rules with explicit peer allowlists and verify the change.

intermediate 6 min read

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