How to get real client ip when using lxd to forward port 80

[simos (Simos Xenitellis)]

@stgraber

There is a protocol that exists for sending the client address in such cases and is supported by nginx, haproxy and a few others. We could in theory add support for that as an option that can be turned on in the proxy, but it’d need the receiving end to be aware of it.

That should be the proxy protocol (also in the second link that @roka wrote earlier),
http://www.haproxy.org/download/1.8/doc/proxy-protocol.txt (implementations in Section 3 or https://www.haproxy.com/blog/haproxy/proxy-protocol/).

There are two versions, 1 (textual) and 2 (binary).
Here is a Go implementation of both versions, GitHub - pires/go-proxyproto: A Go library implementation of the PROXY protocol, versions 1 and 2. (Apache License 2.0).