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
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Neat bot!
Yo this bot is super helpful
Oh I love this idea for a bot! Well done!
Good 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.
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.
Yup, my gemini capsule is suffering from it. :(
I tried that and couldn’t make it work. My server was unable to receive any http requests. Then I tried doing some tweaking in my ISP router configuration but with no success. So far cloudflare tunnel was the only solution I found
port forwarding in your router properly set up?
Yeah I set it up to forward 80:80 and 443:443 but it didn’t seem to have any effect. Does port forward work on ipv6 the same way it does on ipv4?
in m limited sample size of one avm fritz.box, yes. What ivp6 address did you use to try and connect? a device typically has multiple - i.e. dont use fd00::, fe80::
I’d need to check it out, it’s been a while. But I tried pretty much all addresses that are printed out with “ip address” command on linux
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’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.
Been using Tailscale behind CG-NAT for years. It works wonderfully and very rarely needs to route through the DERP infrastructure - it’s almost always a P2P connection.
This page says (at the very bottom):
Tailscale can route its packets peer-to-peer over IPv4 or IPv6, with and without NAT, multi-layer NAT, or CGNAT in the path.
Yeah, you’re absolutely correct. I misread that thinking OP would have the CG NAT endpoint and taikscsle on the same physical device, which, I still think, would be a problem: you’d have two interfaces for 100.64.0.0/10. But if CG NAT terminates on the modem and you run taikscale on devices connected to it them there’s surely no issue at all.
I run it on my router which has the CG-NAT IP address.
Whilst you’re right that it could clash, it’s very unlikely (a 1 in 4194302 chance), I imagine Tailscale would detect the clash and change IPs though I could be wrong as it never happened to me (and probably never will - though in all fairness it will eventually happen to someone).
I went looking into how that works, and, apparently, tailscale adds individual node routes (in table 52). So yeah, you have very low chances of getting into trouble even if you have an interface with 100.64/10.
I haven’t had any issues running Tailscale and cloudflared on the same machines
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.
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.
Oracle is awesome in this one specific way. They suck in all other ways but this is really good.
@skookumasfrig @cmnybo the free tier is limited to 10 Mbps which is kinda slow. It can be a bottleneck
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.
Mine says 0.5gbit
Unless they’re willing to give you your own IP (dynamic, or maybe static for a fee), that’s a good reason for replacing your ISP imo.
You say that as if most don’t hold a monopoly in their available regions. At least in America, you typically have the choice of one, maybe more if you’re in a largeish city, and I suppose you have the option of a 5G hub but that’s terrible for running services.
