Port forward to an inside web server

This example publishes one internal HTTPS server through one WAN-side IPv4 address and enables hairpin access so LAN clients can use the same public name.

The complete, validated YAML is in examples/example-port-forward-web.yaml.

Topology

Diagram map

No.	Meaning	Main resources
[1]	Public-side address and port that clients connect to.	PortForward/web-https.spec.listen
[2]	Router that renders ingress DNAT and hairpin rules.	PortForward/web-https
[3]	LAN interface where hairpin traffic can arrive.	PortForward/web-https.spec.hairpin.interfaces
[4]	Internal HTTPS backend.	PortForward/web-https.spec.target
[5]	LAN client using the public address or public DNS name.	Hairpin path

What this manages

Area	routerd resources
Ingress DNAT	PortForward/web-https
Hairpin access	PortForward.spec.hairpin
Zones and policy	FirewallZone/wan, FirewallZone/lan, FirewallPolicy/home

Key config

# [1] Public-side listener. Hairpin requires a concrete address here.
- apiVersion: firewall.routerd.net/v1alpha1
  kind: PortForward
  metadata:
    name: web-https
  spec:
    listen:
      interface: wan
      address: 203.0.113.10
      protocol: tcp
      port: 443
    # [4] Internal backend that receives the DNATed connection.
    target:
      address: 192.168.10.20
      port: 443
    # [3] Allow LAN clients to use the same public address.
    hairpin:
      enabled: true
      interfaces:
        - lan

Hairpin mode requires a known listen.address or listen.addressFrom, because LAN-side clients must match the public destination address before DNAT.

Checks

routerd validate --config examples/example-port-forward-web.yaml
routerd apply --config examples/example-port-forward-web.yaml --once --dry-run
routerctl describe PortForward/web-https
nft list table ip routerd_nat

Common edits

• Replace 203.0.113.10 with the actual WAN-side IPv4 address.
• Add DNS outside routerd so the public name resolves to that WAN address.
• Keep only the ports you truly intend to publish.