Direct Routing (DR)
What is Direct Routing?
Direct Routing (DR) is a layer 4 load balancing method that directly routes request packets to backend servers by rewriting the destination MAC address of data frames and retransmitting them.
It offers the best scalability and performance owing to the fact that the server responds directly to the client, not via the load balancer, and the fact that MAC address rewriting has a low overhead.
Manual:For frame of reference, see our admin manual
Blog:Load balancing DR benefits over NAT
Blog:Layer 4 DR and Layer 4 TUN in AWS
Blog:Layer 4 vs Layer 7 load balancing: why we still love DSR but...
Blog:15 years later, we still love DSR
Blog:Direct Routing - How to solve the ARP problem on Windows Server 2016