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ISP put me behind NAT (lemmy.world)

submitted 1 year ago* (last edited 1 year ago) by [email protected] to c/[email protected]

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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!

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[–] [email protected] 35 points 1 year ago (8 children)

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.

[–] [email protected] 2 points 1 year ago (7 children)

I’m actually not sure you can easily get tailscale up and running om such as a setup as it uses the same cgnat ip range.

[–] [email protected] 2 points 1 year ago (1 children)

I haven't had any issues running Tailscale and cloudflared on the same machines

[–] [email protected] 1 points 1 year ago

Sorry, I meant the OPs modem.

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