I'm going to attempt to describe a few networking basics to at least help define the problem you are facing. Perhaps you could open a nice fresh beer and bear with me for a moment. Networks are ways for computers to communicate with each other.
Networks are to computers what the telephone system is to people.
There has to be some path to carry messages between them. We're talking wires here, usually. Local, as in right in your own home or office. The WAN can include satellites, fibre optics, and tin cans with strings between them. Most often, the WAN is the public internet, and the LANs at each end are connected to it using Modems or Routers.