this post was submitted on 11 Nov 2023
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ISP put me behind NAT (lemmy.world)
submitted 2 years ago* (last edited 2 years ago) by kokesh@lemmy.world to c/selfhosted@lemmy.world
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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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[–] cmnybo@discuss.tchncs.de 8 points 2 years ago (2 children)

I use a VPN that I setup on an Oracle free tier VPS when I need to access my stuff over IPv4. I also have IPv6, so I can connect directly when using 5G on my phone.

[–] skookumasfrig@sopuli.xyz 2 points 2 years ago (1 children)

Oracle is awesome in this one specific way. They suck in all other ways but this is really good.

[–] teddy@social.teddycaddy.com -1 points 2 years ago (3 children)

@skookumasfrig @cmnybo the free tier is limited to 10 Mbps which is kinda slow. It can be a bottleneck

[–] Perhyte@lemmy.world 2 points 2 years ago

I believe on the free ARM instances you get 1Gbps per core (I've achieved over 2Gbps on my 4-core instance, which was probably limited by the other side of the connections). What you say may be correct for the AMD instances though.

[–] kokesh@lemmy.world 1 points 2 years ago

Mine says 0.5gbit

[–] skookumasfrig@sopuli.xyz 1 points 2 years ago

Yeah, that's a big limitation.

[–] kokesh@lemmy.world 1 points 2 years ago (1 children)

Can I setup a tunnel from my machine to the VPS and link it's IP to my domain?

[–] cmnybo@discuss.tchncs.de 1 points 2 years ago

Yes, if you setup port forwarding on the VPS and open the port in the firewall.