Proxy Protocol v2 support

[fcchbjm]

Hi all,

I recently added Proxy Protocol v2 support (for TCP/TLS) in this fork of dnsproxy, mainly to make it easier to run behind a reverse proxy or load balancer while preserving the real client IP.

A simple example setup would be:

Client → Proxy (send-proxy-v2) → dnsproxy

This works well for DoT / DoTCP and allows things like:

• more accurate logging
• client-based filtering / rate limiting behind a proxy

I'm trying to understand how people are actually deploying dnsproxy in the real world, especially in setups involving proxies or L4 load balancers.

A few things I'm curious about:

• Are you running dnsproxy behind a proxy or LB?
• Do you need real client IP, and for what purpose?
• Is anyone experimenting with DNS-over-QUIC (DoQ) behind a proxy?

If you have a setup (even a simple one), I'd love to hear about it.

Thanks!