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I wrote a small blog about bypassing CGNAT using TLS-passthrough. Cloudflare uses TLS-termination, which means they can see all the data being passed through, which defeats the purpose of privacy.
https://blog.aiquiral.me/bypass-cgnat
Thanks for the nice writeup. Can you explain why you have these rules.
What happens if you remove it ?
I am not sure, actually. Look at the sources, and you'll find the original GitHub link from where I took it. I am not very well versed with
iptables.I am behind CGNAT and I have been trying to set up a WireGuard mesh network to connect my local devices, such as a Raspberry Pi and Proxmox server, as well as my mobile devices, using a VPS as the central point. The goal is to expose locally running applications to the internet without relying on Cloudflare, as they do not allow video streaming and remote access to my local devices. I have looked at many tutorials on this topic, but they often left me confused due to the varying iptables rules and configurations. Some tutorials include specific device names like eth0 in the iptables rules, while others use variables like %i. Additionally, some examples have special rules for SSH access like this one. Apart from that, I am unsure about what additional steps I need to take when I want to run one of the peers as an internet gateway. Despite the confusion, I managed to achieve the basic mesh network setup without implementing any iptables rules for PostUp/Down. Each device in the network receives an IP address within the WireGuard subnet (10.0.0.x) and can ping one another. However, I believe that the iptables rules mentioned in the tutorials would allow accessing other subnets, such as my local LAN, through the WireGuard VPN. I am still uncertain about the exact mechanism behind how these rules work in that context and how to properly configure them for my specific use case, especially considering the CGNAT situation
If you are using the exact rules mentioned in my post, only the ports of your machine will be forwarded, not your entire local network. If you want to forward ports of more than one machine, look at the github link in the sources, it contains a detailed documentation of how to achieve that. Since, I do not know a lot about iptables, I may not be the best person to guide you, in this case. However, feel free to DM me, I'll might be able to help.