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Proxy to TCP port with real IP (lemmy.world)

submitted 1 year ago by [email protected] to c/[email protected]

33 comments fedilink hide all child comments

Simple question, difficult solution. I can't work it out. I have a server at home with a site-to-site VPN to a server in the cloud. The server in the cloud has a public IP.

I want people to access server in the cloud and it should forward traffic through the VPN. I have tried this and it works. I've tried with nginx streams, frp and also HAProxy. They all work, but, in the server at home logs I can only see that people are connecting from the site-to-site VPN, not their actual source IP.

Is there any solution (program/Docker image) that will take a port, forward it to another host (or maybe another program listening on the host) that then modifies the traffic to contain the real source IP. The whole idea is that in the server logs I want to see people's real IP addresses, not the server in the cloud private VPN IP.

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[–] [email protected] 1 points 1 year ago (1 children)

For TCP/UDP traffic, you'd just move the problem on another box. The application logs would report connections from 127.0.0.1 (the local proxy), and not the client IP.

[–] [email protected] 1 points 1 year ago

Yep you are correct, that’s what I was trying to when I was talking about the logs on the public instance and forwarding them to a central place of that is important information, sorry if it didn’t make sense, I must have been tired haha.

I forgot before, it is also possible use ProxyProtocol for TCP applications but the application will need to understand it for it to show in the application logs. It would also be possible to use this to allow the on-prem instance (nginx->nginx let’s say) to see the true client IP from the public instance, the exact configuration is implementation dependent though.