!rant
...
.UseKestrel(options =>
{
options.Listen(new IPAddress(new byte[]{ 192, 168, 178, 20 }), 5000);
})
...
Look at this easy piece of code(that I added) from an Asp.NET Core 2 template project(MVC). I needed only to add this piece of code to WebHost.CreateDefaultBuilder() (in the Program.cs) to be able to setup a working WebServer which will listen and answer on that IP(local network machine IP) and port, then I opened that port from my modem on this local IP, then used DynDNS with noip.com, tested out on my smartphone with 4G connection and it does work!
This is the EASIEST web project setup and test that I've ever tried and that let me showcase something from my machine to the entire world! :')
Great job Microsoft; can't wait to try the cross-platform of this open standard.