How to make a tunnel with full IP forwarding?

Question

Nginx

Hello comrades. What is the point: there are 2 vdski, one on OVH, the second on hatzner. As you know, the latter has such a protection against DDOSa. How can I redirect all casts from OVH to hatzner (any ports)? Another point, you need to get the real IP address of the user to the hatzner.
All this beauty is needed for game servers.
Thanks in advance to everyone who helps.

Answer 1

Nginx is a web server. For forwarding general purpose traffic, you should use other tools, but at least the same iptables / nftables.