An alternative with simpler networking is to to rig up a little Web server on your home OpenWrt router, listening on the WAN interface. When the URL is requested (with authentication of some kind), it runs `etherwake` with the hardcoded MAC address and the hardcoded interface (e.g., `eth1.1`).<p>Then your UI to wake up your machine, from anywhere in the world, would be to access that URL via a Web browser or `curl` script.<p>For accessing the machine once it's awakened, probably you have a single TCP port forward configured on the router, forwarded to the port on the machine for SSH or whatever service is exposed. No other networking config.<p>(You could alternatively code a small "wake-on-demand" program that runs on the router, and initially listens on the port that will be forwarded to the service of the machine, but is resilient against port-scanning (maybe in a service-specific way to validate requests before waking machine), and reliable in setting and unsetting the port forward in the router when the machine is up and down.)