Configuring OPNsense Firewall Rules via API for Cross-VLAN Kubernetes
When I needed to add a node from my DMZ to my Kubernetes cluster on the LAN, I discovered OPNsense has a comprehensive REST API that lets you manage firewall rules programmatically. No clicking through the UI - just curl commands that create rules properly tracked in the configuration and included in backups. The Problem My Kubernetes cluster lives on my LAN (192.168.2.0/24), but I wanted to add a machine from my DMZ (192.168.4.0/24). By default, DMZ traffic can’t reach the LAN - that’s the whole point of a DMZ. I needed to punch specific holes for Kubernetes traffic while keeping everything else blocked. ...