Loadbalancer and IP

Hello everyone,

I use the OVH loadbalancer and baremetal server. Kubernetes is installed on baremetal server.

We put a loadbalancer upstream of our kubernetes nodes. It works on TCP mode on 443 port.
The client's ip is not preserved by the loadbalancer. How can we switch the loadbalancer to passthrough mode to preserve the source ip? or another solution who can preserve initial ip