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Setting Up a Secure Tunnel Between Two Machines
(lemmy.world)
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this post was submitted on 02 Feb 2024
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Can you elaborate on the IP would not be unique part?
If you can fool the Internet that traffic coming from the VPS has the source IP of your home machine what stops you from assuming another IP to bypass an IP whitelist?
Also if you expect return communication, that would go to your VPS which has faked the IP of your home machine. That technique would be very powerful to create man in the middle attacks, i.e. intercepting traffic intended for someone else and manipulating it without leaving a trace.
IP, by virtue of how the protocol works, needs to be a unique identifier for a machine. There are techniques, like CGNAT, that allows multiple machines to share an IP, but really it works (in simplified terms) like a proxy and thus breaks the direct connection and limits you to specific ports. It's also added on top of the IP protocol and requires specific things and either way it's the endpoint, in your case the VPS, which will be the presenting IP.
That's not what I want accomplish. The clients connecting to machine B should not know that their traffic was handled by machine A. I will use DNATs to accomplish my goal. It is possible because tailscale can do exactly that. Thank you for your input though.
Maybe I am wrong we will see soon. 🙃
Well thats just a normal reverse proxy then. In my setup I use Caddy to send traffic through the NetBird managed wireguard tunnel to my home machine that runs Jellyfin but for any outside observer it look like it's my VPS that is serving Jellyfin.
Jes exactly but without being http/https only and without decrypting the traffic on the vps.
That's why the forwarded for header won't work. It's one layer below.