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Measuring ISP Topologies with Rocketfuel Neil Spring Ratul Mahajan David Wetherall

Summary: Measuring ISP Topologies with Rocketfuel
Neil Spring Ratul Mahajan David Wetherall
{nspring,ratul,djw}@cs.washington.edu Computer Science and Engineering
University of Washington
Seattle, WA 98195­2350
To date, realistic ISP topologies have not been accessible to the re­
search community, leaving work that depends on topology on an
uncertain footing. In this paper, we present new Internet mapping
techniques that have enabled us to directly measure router­level ISP
topologies. Our techniques reduce the number of required traces
compared to a brute­force, all­to­all approach by three orders of
magnitude without a significant loss in accuracy. They include the
use of BGP routing tables to focus the measurements, exploiting
properties of IP routing to eliminate redundant measurements, bet­
ter alias resolution, and the use of DNS to divide each map into
POPs and backbone. We collect maps from ten diverse ISPs using
our techniques, and find that our maps are substantially more com­
plete than those of earlier Internet mapping efforts. We also report
on properties of these maps, including the size of POPs, distribu­


Source: Anderson, Richard - Department of Computer Science and Engineering, University of Washington at Seattle
Spring, Neil - Department of Computer Science, University of Maryland at College Park


Collections: Computer Technologies and Information Sciences