Advanced deployment questions usually involve listening addresses, routing, DNS, subnet bypasses, container network modes, and exposed control interfaces. Before deploying on a LAN or in a container, confirm the ports, direct routing for private subnets, and least-privilege access. Test ports and routes one hop at a time. For Docker, also verify the network mode and NET_ADMIN/TUN permissions; save a rollback-ready configuration before changing the gateway.
Map your devices and gateway first
Draw the actual addresses and ports from the client through the container, host, router, and LAN devices. Mark the proxy listeners, firewall, DNS, and private-subnet paths.
- Is the proxy port listening on 0.0.0.0 or the LAN IP?
- Does the firewall allow LAN devices to reach the port?
- Is the LAN subnet being proxied by mistake?
- Does Docker have TUN or NET_ADMIN permissions?
Validate each layer of the path
- Expose only the required ports for LAN sharing, and restrict access to trusted subnets
- Set internal addresses such as the router, this device, printers, and NAS to connect directly
- For a Docker deployment, verify the network mode and permissions first(See TUN FAQ)
- Any externally accessible external-controller must have a secret(See External Controller)
LAN sharing lets other devices use your local proxy port
An incorrect gateway configuration can disrupt every device on the network
Exposing a proxy port or control interface to the public internet is high risk