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Detective and NDT Live’n on the edge of Network Performance

Detective NDT is an international web-based performance tool for network experts that provides real-time monitoring, analysis, and troubleshooting of network performance. It offers a simple bi-directional test, compares performance to analytical values, and translates network values into plain text messages. The tool operates on any client with a Java-enabled web browser and can positively state if the sender, receiver, or network is operating properly, provide accurate application tuning information, and suggest changes to improve performance. However, it cannot pinpoint the exact location of network problems or provide information on other server or client performance.

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Detective and NDT Live’n on the edge of Network Performance

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  1. Detective and NDTLive’n on the edge of Network Performance Joint Techs Winter 2006 Bob Riddle/Rich Carlson {bdr|RCarlson}@internet2.edu

  2. Detective Update • http://people.internet2.edu/~bdr/detective/futures.html • Java Applet for “normal users” • International Detective for net-experts • Retire the “old” clients” Why? • Interoperability with international partners • Extensible • Hetergenous platform support

  3. NDT’s Web100 Based Approach • Simple bi-directional test to gather E2E data • Gather multiple data variables from server • Compare measured performance to analytical values • Translate network values into plain text messages • Geared toward campus area network

  4. Web Based Performance tool • Operates on Any client with a Java enabled Web browser • What it can do • Positively state if Sender, Receiver, or Network is operating properly • Provide accurate application tuning info • Suggest changes to improve performance

  5. Web base Performance tool • What it can’t do • Tell you where in the network the problem is • Tell you how other servers perform • Tell you how other clients will perform

  6. Integrating NDT and Detective Local Browser /w Java Internet2 Detective Network Detect “Detective” Monitoring Applet Discovery Analysis Interface Web Service Module Module Measurement Authorize Domain Interface (MDI) Performance Measurement Domain (PMD) Performance Schedule Measurement Controller (PMC) Performance Measurement Point (PMP) Test BWCTL OWAMP TraceRoute NDT Store Database

  7. NDT Tests for: • Bi-directional achieved speed • NAT detection • Bottleneck Link Detection • Duplex Mismatch Detection • Network congestion • Faulty Cables • Path Duplex operating mode

  8. NDT testing shows Duplex Mismatch at one end

  9. Duplex Mismatch Corrected

  10. Availability • Open Source Development project • http://www.sourceforge.net/projects/ndt • Tools available via from • http://e2epi.internet2.edu/ndt/download.html • Contains source code • Email discussion list ndt-users@internet2.edu • Goto http://e2epi.internet2.edu/ndt web site and click • ndt-users – General discussion on NDT tool • ndt-announce – Announcements on new features

  11. NDT servers

  12. NDT Benefits • End-user based view of network • Can identify configuration problems • Can identify performance bottlenecks • Provides some ‘hard evidence’ to users and network administrators to reduce finger pointing • Doesn’t rely on historical data

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