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!
Acronyms, initialisms, abbreviations, contractions, and other phrases which expand to something larger, that I’ve seen in this thread:
Fewer Letters More Letters CGNAT Carrier-Grade NAT DNS Domain Name Service/System Git Popular version control system, primarily for code HTTP Hypertext Transfer Protocol, the Web IP Internet Protocol NAT Network Address Translation VPN Virtual Private Network VPS Virtual Private Server (opposed to shared hosting) nginx Popular HTTP server
[Thread #274 for this sub, first seen 11th Nov 2023, 18:30] [FAQ] [Full list] [Contact] [Source code]
Neat bot!
Welcome to the world of Carrier Grade NAT. 100.64.0.0/10 is reserved for this.
If you are lucky, you also have an IPv6 address. The catch is you need IPv6 on the client-side too.
A VPS or similar running wireguard and a proxy might bridge the gap.
It might also be possible to ask your provider for some port forwarding. Probably not, but check anyway.
Good luck!
This is exactly what happened to me, but was able to contact my ISP to drop IPv6 support and get back my ports forwarding to work on my line
N.B. to anyone reading this: ask your isp to “opt out of CG-NAT”. Talking about IPv6 may confuse the staffer you’re talking to, it’s partially related but not the fully picture.
Have you reached out to your ISP to see if they can give you a dynamic public IP? I recently swapped to a new ISP that was using CGNAT but after contacting their support team with my use case, they were happy to set me up with a public IP so I could continue my self-hosting.
You’re already using cloudflare, so check out cloudflare tunnels. You install their software on your server which makes an outbound connection, bypassing the need for open ports or a public IP. Note this only does http traffic.
Another option is tail scale, which won’t make your site public but will let you access it remotely on devices you have their software/app on.
i’ve been on CGNAT and just pointed my domain to my ipv6 address with no issues - every isp should hand out huge v6 subnets dedicated to you.
Since my v6 prefix is not stable, i use ddclient from my homeserver to update my domains AAAA record
Unfortunately IPv6 adoption is not universal. There will be parts of the internet that won’t be able to reach you at a 6-only address.
