11/02 : Thesis Defense - "Automated system to debug under-performing network flows in wide area networks" - Harika Tandra, Master’s Candidate

Where: 414 Ferris Hall

When: Monday, November 2, 2009 at 12.00 P.M.

What: “Automated system to debug under-performing network flows in wide area networks”

Who: Harika Tandra, Master’s Candidate
Dr. Hairong Qi, Major Professor

Abstract

Locating the cause of performance losses in large high performance Wide Area Networks (WAN) is an extremely challenging problem. This is because WANs comprise of several distributed sub-networks (Autonomous Networks), with their own independent network monitoring systems. Each individual monitoring system has limited or no access to network devices outside its own network. Moreover, conventional network monitoring systems are designed only to provide information about the health of individual network devices, and do not provide sufficient information to monitor end-to-end performance. Thus, adding severe overhead on debugging end-to-end performance issues.

In this thesis, an automated tool is designed that requires no special access to network devices and no software installations on the network devices or end hosts. The system detects performance losses and locates the most likely problem nodes (routers/links) in the network. A key component of this system is the novel hybrid network monitoring/data collection system. The monitoring/data collection sub-system is designed to use best of both active and passive monitoring techniques. Pattern analysis algorithms are then developed to locate the causes of performance loss using the data collected from the monitoring/data collection sub-system.

This system is being tested on the GLORIAD (Global Ring Network for Advanced Application Development) network. One of the future goals is to integrate this system into the GLORIAD’s network monitoring tool set, and to provide end-to-end network monitoring capabilities.