"an idiot who keeps forwarding shit to you" - www.urbandictionary.com
Script which allows you to connect from Internet to your private host in LAN.
- It forwards trafic incoming to PUBLIC_IP:PORT to "localhost interface on PUBLIC_IP:OTHER_PORT" and then from "localhost interface on PUBLIC_IP:OTHER_PORT" to LOCAL_IP:PORT. OTHER_PORT is just a helper.
- Logging via keys is highly recommended.
- Run it e.g. via cron.