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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[–] tal@lemmy.today 5 points 2 years ago* (last edited 2 years ago) (1 children)

I dunno. The IPv4 address space is getting pretty tight, and aside from rejiggering existing inefficient allocations, there's not a lot you can do beyond NAT.

In the US, we had it pretty good for a long time, because we had a rather disproportionate chunk of the IPv4 address space -- Ford, MIT, and Apple alone each had their own Class A netblock, about half a percent of the IPv4 address space each, for example.

But things have steadily gotten tighter as more and more of the world uses the Internet more and more.

https://whatismyipaddress.com/ipv6-ready

As expected, the ISPs are no longer receiving new allotments or allocations of public IPv4 addresses from the American Registry for Internet Numbers (ARIN). Some have managed to continue to provide new IPv4 addresses by reallocating some of the addresses they had been assigned in the past but perhaps had never passed on to customers. This buys them a little more time while they scramble to roll out and support IPv6 addresses.

Like, there's real scarcity of the resource. It doesn't require the scarcity to be artificially-induced.

My ISP used to let one get a /29 IPv4 block for residential users, though they stopped that years ago. Always have had a way to get publicly-facing IPv6 addresses, though.

End of the day, the real fix is to get the world on IPv6.

[–] nik282000@lemmy.ca 1 points 2 years ago

IPv6.

Not even offered in my area 🤡