1 / 19

Comparing the Accuracy of Network Simulators for Packet-Level Analysis using a Network Testbed

Comparing the Accuracy of Network Simulators for Packet-Level Analysis using a Network Testbed. Chaudhry Usman Ali UNB, Fredericton. TESTING SIMULATOR ACCURACY. Measure real network traffic. Compare real network traffic with the simulator results. METHODS OF SIMULATION.

neo
Download Presentation

Comparing the Accuracy of Network Simulators for Packet-Level Analysis using a Network Testbed

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Comparing the Accuracy of Network Simulators for Packet-Level Analysis using a Network Testbed Chaudhry Usman Ali UNB, Fredericton

  2. TESTING SIMULATOR ACCURACY • Measure real network traffic. • Compare real network traffic with the simulator results.

  3. METHODS OF SIMULATION NS-2 and OPNET use a hybrid approach.

  4. SIMULATION TOOLS • OPNET MODELLER • NS-2 Finite State Machine + Analytical Model. 400 special purpose modelling functions. Not open source. Model parameters can be altered. Numerous models of Internet protocols. NAM network animator. Animations and graphs. Custom applications and protocols can be created.

  5. NETWORK TESTBED

  6. NETWORK REPRESENTATION

  7. EXPERIMENTS

  8. PARAMETER TUNING

  9. TRAFFIC SCENARIOS

  10. RESULTS

  11. Sudden drop

  12. Conclusions • Pure CBR type traffic. (NS-2 performed better). • In one scenario OPNET performed “better”. • FTP Experiments • NS-2FTP simulation model only indicated general transfer rate rather than replicating the actual network flow. • OPNET performed closely to the testbed results. • Simulation speed was fast in both simulators. • Thelearning curve was different and steep at times. • NS-2: “script” generated. • OPNET:User Interface.

  13. Conclusions Contd.. • In FTP session, simulators did not model the dynamic behaviour of FTP in standard form. • FTPadapts its output to prevailing network conditions. • NS-2 and OPNET did not always mimic this performance. • However, OPNET performed better.

  14. Future Work • Establishing a scheme to model HTTP in the simulators and the testbed.

  15. REFERENCE • G. Flores-Lucio, M. Paredes-Farrera, E. Jammeh, M. Fleury, and M. Reed, OPNET-Modeler and NS-2: "Comparing the Accuracy of Network Simulators for Packet-Level Analysis using a Network Testbed". 3rd WEAS Int. Conf. on Simulation, Modelling and Optimization (ICOSMO 2003), Crete, vol. 2, pp. 700-707, 2003.

More Related