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  1. Notes/

Direct Server Return

  • server directly responds to the client without the load balancers involvement
  • use when the client request is small, but the servers response is large (UDP, video & audio streaming via RTSP)
  • ARP (Address Resolution Protocol) requests must be ignored by the backend servers. If not, the VIP traffic routing will be bypassed as the backend server establishes a direct two way connection with the client.
  • total output bandwidth is the sum of each backend bandwidth
  • When use this architecture?
    • where response time matters
    • where no intelligence is required
    • when output capacity of the load-balancer could be the bottleneck
  • What is Direct Server Return & Why Does it Matter?
  • layer 4 load balancing Direct Server Return mode