CentOS7. How to set up forwarding of UDP traffic from one server to another?

Question

CentOS

There are two servers. Both run the same service that communicates with clients via the UDP protocol. Moreover, the transfer principle is such that after sending a portion of data, the client waits for confirmation from the server (that the data has been successfully processed). So the task is as follows: we configure clients so that they send data to SRV1, but not directly to the service, but to a certain relay, which in turn duplicates the data to the local service and to the UDP port of the same service on another server (SRV2). But it is important that the response sent to the client is the one that came with SRV1, and the response from SRV2 is simply ignored.

Answer 1

UDP does not guarantee delivery. If you're waiting for a delivery confirmation, then it's TCP.
What is this data? What's the software?
On the move, I can offer the Port mirroring function