That works the same way. Finding Your Public IP, your public IP is the address that you can give your friends so they can connect to the server when it is online, of course they could also find the same. Create a new forwarding setting, on some routers there will be no button and you just enter into boxes. Keep this number safe as you will need it later. Make another custom service with the same settings but with a Starting Port and Ending Port of 27016. The map start Bat Gmod HAS TO be placed in: C:srcdsorangeboxgarrysmodmaps It has to have the file extension.bsp aswell.