Development & Evaluation of Network Test-beds

1. Development & Evaluation of Network Test-beds -Vinod Kumar Rajasekaran Internet Research Group at Clemson University

2. Overview of today’s presentation • Introduction to Network Simulation • Its significance in the research community • Design issues • Problems • Related projects • My work Internet Research Group at Clemson University

3. Research in Networking • “Internet” drives today’s world • Research in Networking – Top priority • Current needs Vs Future Internet • Methods for Evaluating new network components • Direct testing • Network test-beds Internet Research Group at Clemson University

4. Live Testing • Real code in real environment. • Accurate measurement and experimentation • Problems: • Difficult to conduct test • Scenarios not reproducible • Possible only at the tail end of development Internet Research Group at Clemson University

5. Significance of Simulation • Requires a “thorough” understanding of existing technologies. • Provides infrastructure for developing new designs • Provides an opportunity to predict results on a “future Internet”. • Provides a reproducible scenarios Contd… Internet Research Group at Clemson University

6. Significance of Simulation • Opportunity to explore the range of protocol designs • Cheap and easy to use Internet Research Group at Clemson University

7. Design goals • Research specific model • Scalability • Usability (Visualization tools) • Emulation • Models for the Future Internet Research Group at Clemson University

8. Design issues • Abstraction in simulation • What to abstract? • The Need! • Parallelism Vs abstraction • Issues • Critical parameters Graph Contd… Internet Research Group at Clemson University

9. Design issues • Simulation Scenario • Testing designs individually as well interactively - Imperative • -The input configuration • Network Topology • Traffic Model • Test Generation • Network Dynamics Internet Research Group at Clemson University

10. Difficulties in test-bed creation • Size of the Internet • Heterogeneity • Topology changes • Protocol differences • Traffic generation • Trace driven simulation • Traffic shaping • Congestion levels • Scaling • Growth rate of Internetgraph Internet Research Group at Clemson University

11. Related Projects • VINT • Model Net • Net bed • NIST • …. Internet Research Group at Clemson University

12. Model Net • Done by ISSG, Dept of CS, Duke University • Large-scale network emulator • Cluster-based emulation environment Contd… Internet Research Group at Clemson University

13. Model Net Phases • Create • GML graph • Distillation • GML Pipe • Assignment • Load balancing among cores • Bind • Load balancing VNs • Run Contd… Internet Research Group at Clemson University

14. Model Net • Packet scheduling • Emulation accuracy • Routing Internet Research Group at Clemson University

15. My work • Long term (Thesis ideas) • Use of virtual Linux Servers for networking research • Evaluation of virtual Linux Servers for education • Immediate work • Understanding of related topics • Working with vmware Internet Research Group at Clemson University