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iPerf is a point-to-point network tool for active measurements of throughput between two servers in both directions. As we have 2 physical servers we We need to install iPerf tool on all our 2 physical servers with command sudo apt-get install iperf3. We will test the bandwidth speed from the origin servers (iperf iPerf client serverservers) in fact HCoS#1-A, HCoS#1-C and HCoS#2-D to the destination server (iperf iPerf listening server) in fact HCoS#2-B. All these servers are logical servers from iPerf perspective and because of nature of iPerf we need to use different TCP port for testing when we send traffic from iPerf clinets to iPerf server in order to get all results on servers.