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Proxy to TCP port with real IP
(lemmy.world)
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this post was submitted on 17 Jul 2023
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The way I would solve this is by putting nginx or other reverse proxy directly on your instance in the cloud. You can use this to set one of the well known proxy headers and proxies as others have mentioned and have this then proxy to your backend instances over the VPN (even if it’s pointing to an internal nginx instance). Then the access logs on your cloud instance will also contain the actual IP address of the client, setting headers will obviously only work for HTTP traffic, there really isn’t a similar mechanism for TCP/UDP traffic as those are layer 3 and HTTP is layer 4. If you are concerned about it you can always ship the logs to somewhere on prem as well.
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.
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.