104
submitted 1 year ago* (last edited 1 year ago) by kokesh@lemmy.world to c/selfhosted@lemmy.world

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!

you are viewing a single comment's thread
view the rest of the comments
[-] poVoq@slrpnk.net 4 points 1 year ago

If they sell an "internet connection" then selling one behind a CGNAT is a breach of contract, because it is not a connection to the internet but only a selective forwarding service from within their intranet.

Similar to how the consumer protection agencies fought against fake speed promises and hidden "fair use" volume clauses, CGNAT should also be forbidden to be advertised as "internet".

[-] Schmeckinger@feddit.de 2 points 1 year ago* (last edited 1 year ago)

We have more internet connections than IPv4's they can't just pull new ones out of their ass. Also IPv6 is internet too.

[-] poVoq@slrpnk.net -2 points 1 year ago

This is a myth. There are large swath of IPv4 address spaces totally unused and many ISPs hoard them without actually using them.

An IPv6 only internet connection would also still be miles better than CGNAT connection.

[-] Schmeckinger@feddit.de 1 points 1 year ago* (last edited 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.

[-] poVoq@slrpnk.net 0 points 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.

[-] Schmeckinger@feddit.de 1 points 1 year ago

CGNAT usually only applies to the IPv4. The IPv6 prefix you get is usually public.

[-] poVoq@slrpnk.net 0 points 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.de 1 points 1 year ago* (last edited 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.

[-] Appoxo@lemmy.dbzer0.com 1 points 1 year ago

In addition this also depends on the ISP.

[-] Schmeckinger@feddit.de 1 points 1 year ago

I have experience with Vodafone, Deutsche Glasfaser and Unitymedia and they all did it like this. It also might depend on the state.

[-] Appoxo@lemmy.dbzer0.com 1 points 1 year ago

Kinda expected that.
Vodafone usually does DS-Lite tunnel
Deutsche Glasfaser is a new player so CG-Nat was to be expected.

[-] DoomBot5@lemmy.world 0 points 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.

[-] poVoq@slrpnk.net 0 points 1 year ago* (last edited 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.world 0 points 1 year ago

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

[-] poVoq@slrpnk.net 0 points 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.world 0 points 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.

[-] poVoq@slrpnk.net 1 points 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.world 0 points 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.

[-] poVoq@slrpnk.net 0 points 1 year ago

That's like saying internet is not internet. And I very much expect my internet connection to have a public IP.

[-] DoomBot5@lemmy.world 0 points 1 year ago

No, I'm just saying you're wrong at this point. You just keep proving that to be true with every reply.

[-] poVoq@slrpnk.net 0 points 1 year ago

So I am wrong for saying water is water and not fire?

[-] DoomBot5@lemmy.world 0 points 1 year ago

Except you keep claiming it's fire. It's not fire, so stop calling it such.

[-] poVoq@slrpnk.net 0 points 1 year ago

You are extremly confused, sorry to say. Please look up the difference between "Internet" and "Intranet".

[-] DoomBot5@lemmy.world 0 points 1 year ago

No, I don't think I am. You're just wrong and don't want to admit it. Some self reflection will do you good.

[-] poVoq@slrpnk.net 0 points 1 year ago

There is nothing to admit. You are simply not willing to concede that the original definition of "internet" is still valid and watering that down serves no purpose other that muddling the waters and allowing huge corporations to increase their profits by cheating on their customers.

[-] DoomBot5@lemmy.world 0 points 1 year ago

See above comment for reply then sprinkle a bit of irony for the projection coming from you.

[-] poVoq@slrpnk.net 0 points 1 year ago

Well, if you insist on stanning for multi billion dollar companies that are cheating on their customers then I guess all we can do is to disagree.

[-] DoomBot5@lemmy.world 0 points 1 year ago

No, just disagreeing the bullshit of a clueless internet stranger.

[-] poVoq@slrpnk.net 0 points 1 year ago
[-] DoomBot5@lemmy.world 0 points 1 year ago

Yeah, but you really don't need to be an ass and flaunt it everywhere.

[-] poVoq@slrpnk.net 0 points 1 year ago

You started with the impolite language...

this post was submitted on 11 Nov 2023
104 points (92.6% liked)

Selfhosted

40199 readers
632 users here now

A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.

Rules:

  1. Be civil: we're here to support and learn from one another. Insults won't be tolerated. Flame wars are frowned upon.

  2. No spam posting.

  3. Posts have to be centered around self-hosting. There are other communities for discussing hardware or home computing. If it's not obvious why your post topic revolves around selfhosting, please include details to make it clear.

  4. Don't duplicate the full text of your blog or github here. Just post the link for folks to click.

  5. Submission headline should match the article title (don’t cherry-pick information from the title to fit your agenda).

  6. No trolling.

Resources:

Any issues on the community? Report it using the report flag.

Questions? DM the mods!

founded 1 year ago
MODERATORS