Acknowledgments

Vern Paxson made his 1995 data set available to us. Arvind Arasu, B. R. Badrinath, Mary Baker, Paul Barford, John Byers, Imrich Chlamtac, Mike Dahlin, Kevin Jeffay, Craig Labovitz, Paul Leyland, Karthik Mahesh, Vijay Parthasarathy, Jerry Prince, Amin Vahdat, Srinivasan Venkatachary, Geoff Voelker, Marcel Waldvogel, and David Wood helped us obtain access to a geographically distributed set of measurement hosts. Vern Paxson and the anonymous USENIX reviewers provided useful comments on an earlier version of this paper. We would like to thank them all.