12:45PM, Thursday, March 10th 2005.
Gates 104

NetProfiler: Profiling Wide-Area Networks Using Peer Cooperation

Venkata Padmanabhan
Microsoft Research

About the talk:
Our work is motivated by two observations about the state of networks today. Operators have little visibility into the end users' network experience while end users have little information or recourse when they encounter problems. We propose a system called NetProfiler, in which end hosts share their observations of network performance with their peers.  The aggregated information from multiple hosts helps NetProfiler overcome the opacity of the wide-area network and profile the network in interesting ways.
As an initial step, we have conducted a month-long experiment using a diverse collection of 134 client hosts to evaluate the feasibility and effectiveness of a NetProfiler-style approach to network diagnosis. By correlating observations made across the set of client hosts, we present a novel characterization of the nature and extent of end-to-end Internet faults. We conclude with a discussion of some of the key challenges to realizing the NetProfiler system in practice and our ongoing work in this direction.

About the speaker:
Venkat Padmanabhan is a Researcher in the Networking group at Microsoft Research, where he has been since receiving his PhD from UC Berkeley in 1998. His research interests include Internet protocols and applications, network measurement & inference, and wireless networking.  Venkat has been active on the editorial boards and program committees of several networking and mobile computing journals and conferences. He is presently serving as Program Co-Chair for the ACM/USENIX Internet Measurement Conference (IMC) 2005. He also holds affiliate faculty appointments in the CS and EE departments at the University of Washington, where he has taught and served on student thesis committees.  Venkat can be reached on the Web at http://www.research.microsoft.com/~padmanab.