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BNL’s Network diagnostic tool

BNL’s Network diagnostic tool. IPERF was used and combined with different strategies to analyze network bandwidth performance such as: -Test with iperf server inside firewall (where oracle cluster resides) -Test with iperf server outside firewall.

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BNL’s Network diagnostic tool

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  1. BNL’s Network diagnostic tool IPERF was used and combined with different strategies to analyze network bandwidth performance such as: -Test with iperf server inside firewall (where oracle cluster resides) -Test with iperf server outside firewall. -Test with client at CERN to host inside/outside BNL firewall -Test with client inside BNL’s firewall host inside firewall -Test with client at BNL’s bounder firewall host inside firewall. These tests can be deployed for different well known parameters IPERF tool has such: -w, TCP window size (64KB- 8MB) - t, time to transmit (default 10 seconds) -P, number of parallel clients threats. BNL’s simple test to show firewall impact on bandwidth using IPERF

  2. BNL’s elaborated test using IPERF to study firewall’s impact on bandwidth Fig 1. By Dimitrios Katramatos • Single iperf stream with bandwidth throttled at the router. • Test performed the same day same network traffic. • Results showed how the bandwidth is constrained by the firewall.

  3. Web100 based Network Diagnostic Tool (NDT) -Performs 2 TCP throughput tests between the host originator and the NDT server -Data is streamed for 10 seconds from host originator, then a second 10 second test is performed in opposite direction. -A web100 modified Linux kernel captures statistics on TCP data flows. -The Web100 software implements instruments in the Linux TCP/IP stack. -Deals with the problem of host systems that is optimized for low bandwidth environments, and the lack of effective instrumentation and tools to diagnose performance issues. -The NDT tool can diagnose excessive packet loss due to faulty cable. -If the buffer size from the host originator is low the tool reports to increase it. In order to access this tool a web browser and java needs to be installed on the host originator Other publicly accessible NDT servers: * Argonne National Laboratory - IL (USA) * Swiss Education and Research Network (Switzerland) * Rochester Institute of Technology - Rochester NY (USA) * University of Michigan - Flint MI (USA) * University of California - Santa Cruz CA (USA)

  4. BNL’s NDT test

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