I've most likely seen this in guides, that you just do what you're supposed to do, just not forwarding the ports if you have a modem. With a modem, I can't really forward any ports seeing as there's no menu for that in the modem. But, I wanted to see if it was possible to get my private server online on my laptop, and here's what I find quite difficult about it. The IP I get from both my laptop (The one I'm hosting the private server on atm) and the stationary is pretty much the same. I took some screenshots.
Laptop:
Stationary:
So I was wondering if anyone had any idea of how I then can put my server online?
PS: My modem is 4 ported, so that's how I run 2 computers at the same time.