I’m connected via a 4G modem. Got this setup about 3 years ago. In the beginning it was enough to look for the public IP (what’s my IP). The modem showed some sort of private ip in the ui. I’m running stuff at home (Homeassistant, Gitea,) and bought a domain and pointed it to my home IP via Cloudflare. After some time I’ve noticed my modem shows the public IP also internally. For about 2 years now it ran flawlessly, the IP changed from time to time, but not really more than once in several weeks. For about a week all stopped working and the modem shows IP 100.xxxx and outside 85.something I guess I’m behind NAT now. Normal port forwarding on the modem is useless now. Is it possible to open the ports via UPNP? I’ve tried via miniupnp from my Ubuntu server, but it just throws an error.

upnpc -a ifconfig enp1s0| grep "inet addr" | cut -d : -f 2 | cut -d " " -f 1 22 22 TCP

Can I use this to somehow open the ports via UPNP on my modem and bypass the blocking? I can’t even OpenVPN to my modem anymore.

EDIT: i also run AdguardHome, that I use as Private DNS on my Android phone

UPDATE: everything except Adguard Home used as Private DND on my Android works! I’ve used this: https://github.com/mochman/Bypass_CGNAT/wiki/Oracle-Cloud-(Automatic-Installer-Script) - free Oracle VPS + automated well described script. Even HTTPS works fine!

  • @Schmeckinger@feddit.deEnglish
    1•1 year ago

    How? You can literally turn IPv4 off on your whole network, or selectively by device. But if you turn off your IPv4 you will get cut off of a good chunk of the internet.

    And the only reason we have unused IPv4’s is because a big part of the internet is behind NAT of some kind like CGNAT.

    • poVoqEnglish
      2•1 year ago

      There is nothing wrong with an organization sharing an single IPv4 internally via NAT, but if your ISP sells you a connection to the internet, this by definition means you get a unique public IP address, otherwise it isn’t an internet connection.

      IPv6 support could be better for sure, but it is still much better than not having an internet connection at all as in the case of a CGNAT.

      • @DoomBot5@lemmy.worldEnglish
        1•1 year ago

        No it doesn’t. It means you have access to the internet through that company’s infrastructure. You still have full access to the internet behind a CGNAT even if you can’t be reached directly from the internet.

        • poVoqEnglish
          1•1 year ago

          An internet connection by definition is two-way. The internet was designed as a network of interconnected computers. A one-way only connection like through a CGNAT is preventing you from doing a lot of things the internet was designed for.

          • @DoomBot5@lemmy.worldEnglish
            1•1 year ago

            You have a 2 way connection as facilitated by the CGNAT gateway that routes responses back to your network.

            • poVoqEnglish
              1•1 year ago

              If you have no unique public IP there are a lot of things you can’t do, so it isn’t a true two way connection.

              • @DoomBot5@lemmy.worldEnglish
                1•1 year ago

                No, it just doesn’t fit in your imagination, but it is a 2 way connection by definition. It’s also everything the ISP promises when they give you an internet connection.

                • poVoqEnglish
                  2•1 year ago

                  Sorry, but you are using a wrong definition of an internet connection. A internet connection has by definition a unique public IP, otherwise it is only a intranet connection. That has nothing to do with my imagination and I can assure you that I would never pay for a CGNAT connection as most of what I do with my internet connection is not possible with that crap.

                  • @DoomBot5@lemmy.worldEnglish
                    1•1 year ago

                    Your definition does not make it the definition. Nobody really cares about your definitions or what you would do with it. People care about the accepted definitions and what is the expectation.

        • poVoqEnglish
          1•1 year ago

          “Usually”? In my experience usually this is not the case. Starlink for example promised to make ipv6 available like that, but AFAIK it is still CGNAT only.

          • @Schmeckinger@feddit.deEnglish
            1•1 year ago

            I can only talk how it is in Germany, where CGNAT with a public IPv6 prefix is the norm and a public IPv4 costs extra money unless you have a legacy contract.