this post was submitted on 17 Jul 2023
24 points (92.9% liked)

Selfhosted

40246 readers
972 users here now

A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.

Rules:

  1. Be civil: we're here to support and learn from one another. Insults won't be tolerated. Flame wars are frowned upon.

  2. No spam posting.

  3. Posts have to be centered around self-hosting. There are other communities for discussing hardware or home computing. If it's not obvious why your post topic revolves around selfhosting, please include details to make it clear.

  4. Don't duplicate the full text of your blog or github here. Just post the link for folks to click.

  5. Submission headline should match the article title (don’t cherry-pick information from the title to fit your agenda).

  6. No trolling.

Resources:

Any issues on the community? Report it using the report flag.

Questions? DM the mods!

founded 1 year ago
MODERATORS
ruud@lemmy.world
Loki@lemmy.world
CannaVet@lemmy.world
devve@lemmy.world
HybridSarcasm@lemmy.world
HybridSarcasm@lemmy.hybridsarcasm.xyz
24
Proxy to TCP port with real IP (lemmy.world)
submitted 1 year ago by nickshanks@lemmy.world to c/selfhosted@lemmy.world
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.

you are viewing a single comment's thread
view the rest of the comments
[–] nickshanks@lemmy.world 1 points 1 year ago

I realised I forgot to update this. Thank you to everyone that contributed, I appreciate it. This was a weird use case and barely anyone online has documented it, only a handful of places. Nevertheless, I figured it out.

So basically, you run HAProxy with the send-proxy-v2 protocol. Let’s say I’m forwarding SSH from VPS to home, I’d have the VPS running HAProxy listening on port 22. Then I’d have it forward to home on port 220. Then, on the home server, you run this amazing piece of software called go-mmproxy. Configure that to listen on port 220 and forward to localhost 22. And there you have it.

HAProxy passes the real source IP to go-mmproxy with the proxy protocol, go-mmproxy takes the proxy header and strips it from the request, spoofs the source IP address from localhost to the real source IP contained in the proxy header then makes the request to localhost. And then you also have to configure traffic to go back through localhost so go-mmproxy can pick it up and add the proxy header back to the request, to be sent back to the source.