Bio: Geoffrey Voelker joined the UCSD faculty in June of 2000. With Jacobs School colleagues Stefan Savage and Keith Marzullo, he runs the Reliable-Adaptive Multi-Path (RAMP) network project. He also leads the PAWNs project, a collaboration with Microsoft Research. He is a member of the Adaptive Systems project with colleagues at UCSD and Ericsson Research. He received his Ph.D. from the University of Washington in 2000.  

Research: With the RAMP project, Professor Voelker is developing new analytic techniques for reasoning about Byzantine attacks against the control plane of the routing infrastructure, new multi-path routing protocols that leverage network diversity to mask failures of the data plane, and quantitative network security measurements and analyses of network failure models and attacks. Recently, with colleagues Stefan Savage and David Moore, he developed the 'backscatter analysis' approach to inferring global Denial-of-Service activity. This work was the first quantitative characterization of the prevalence of flooding-style denial-of-service attacks in the Internet. He is now investigating large-scale quarantine systems for mitigating the spread of self-propagating code (worms) in the Internet. Voelker is also developing wireless location systems and location-aware load balancing systems for public-area wireless networks (PAWNs), topology and mobility models for ad-hoc networks, and loss differentiation algorithms for wireless video transport protocols. He also conducts research in Web caching, studying the performance of caching systems, user workloads, and content distribution systems. He is also researching the design of large-scale distributed systems using highly unavailable hosts in the context of peer-to-peer networks.