How to port forward on a Mac?
<p>I'm running OS X Sierra and I'm connected to an Apple AirPort Time Capsule. I cannot, for the life of me, find how to properly port forward the stupid computer. I have a good amount of programming experience, but know hardly anything of networking. I have a functional Node Express server that I can run and access through <code>localhost</code> on my machine, but I want to open it to some friends. I recall when port forwarding for a Minecraft server a long time ago on Windows, and had a Linksys router, all I had to do was type in the router's local IPv4 in the browser and port forward using Linksys controls. I have my server listening on port <code>8080</code>, what to do to make it available at an external IP address? Internet basics were briefly explained to me recently, but an additional explanation of how local networks work and how they interact with other networks would be greatly appreciated!</p>