Comment by pmontra

Companies with an IT department, maybe. Companies without IT, not much. People, nope.

I can't see my neighbors opening ports on their switch. What's a switch, to start with. And what happens when they change provider and switch next month?

It's much easier to tell them: I install two boxes. One is the camera (or whatever), the other one is necessary to make the camera work properly, keep it online, don't switch it off.