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[–] 1 point 2 years ago (1 child)

You might be on a CG-NAT network which makes port forwarding impossible. Some ISPs will disable it if you ask (or give you an ipv6 IP which isn't affected by the issue).

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  • [–] 1 point 2 years ago (1 child)

    How can I go about learning what any of this means and how to look for it?

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  • [–] 2 points 2 years ago*

    If you go to https://ipinfo.io at home (over wifi or ethernet) and it says your ip is in the 100.64.0.0/10 range, then you are on a CG-NAT network.

    This wikipedia article may be helpful. The short answer is that we are running out of public IPv4 addresses so CG-NAT is used so a bunch of users can essentially share 1 (or a few) public IPs. From the router's perspective, you have a public IP that is actually a private IP in the 100.64.0.0/10 range.

    However, not having a real public IP means you have no way for remote devices to directly access your router, so port forwarding won't work.

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