IPIP/GRE tunnel to filter game server traffic?

Question

linux

Hello, it is necessary to make sure that the traffic from the equipment where the game server is located IP 1.1.1.1 passes through the server where the traffic will be filtered (its IP 2.2.2.2), after filtering, pure traffic (legal) is sent to the game server, read the documentation about GRE/ I didn’t fully understand IPIP, because there you also need to configure the equipment where the game server is located and the servers should be located in one DC on the same subnet, but this is not physically possible.
VDS server with game server is located in Russia and
Dedicated server for traffic filtering is located in France/OVH Sorry
if I didn't put it right

Answer 1

I didn’t fully understand about GRE / IPIP, because there you also need to configure the equipment where the game server is located and the servers should be located in the same DC on the same subnet,

There is equipment that supports the creation of such "appartano" tunnels.
But you can also issue a command like this on both servers:
configure IP addresses and the tunnel is ready, but remember that your ping will increase with this design!
You will have a new network adapter tun0 on each server