Selfhosted
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Preserve the source IP you say, why?
The thing is that if you could (without circumventing the standards) do so then that implies that IP isn't actually a unique identifier, which is needs to be. It would also mean circumventing whitelists / blacklists would be trivial (it's not hard by any means but has some specific requirements).
The correct way to do this, even if there might be some hack you could do to get the actual source IP through, is to put the source in a 'X-Forwarded-For' header.
As for ready solutions I use NetBird which has open source clients for Windows, Linux and Android that I use without issues and it's perfectly self-hostable and easy to integrate with your own IDP.
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.
Each time you send a packet over the internet, several routers handle this packet without touching the source and destination IP addresses.
There is nothing stopping him from configuring the VPS in a way that forwards packets from the home server, rewriting the destination IP (and optionally destination port as well) but leaving the source IP intact.
For outgoing packets, the VPS should rewrite the source (homeserver) IP and port and leave the destination intact.
With iptables, this is done with
MASQUERADErules.This is pretty much how any NAT, including ones behind home routers, work.
You then configure the homeserver to use the VPS as a gateway over wireguard, which should achieve the desired result.
Yeah, I was just confused about the direction/flow he was asking for. He clarified and his use case is fully solvable. Just not something I've personally dabbled in since he wants it for non http traffic.