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Internet Captivity and De-peeringMartin A. Brown, Clint Hepner, and Alin Popescu, Renesys CorporationPresentation Date: January 27, 2009, 3:00 PM - 3:30 PMRoom: La Fiesta Theater Abstract: De-peering events are bad, but when the combatants involved are transit-free networks, they can be catastrophic to captive customers. Such events break the promise of One Internet by preventing single-homed prefixes in each of the de-peered parties' transit cones from exchanging traffic with each other. A recent de-peering event illustrated the perfect storm scenario: two transit-free networks--Sprint (AS 1239) and Cogent (AS 174)--de-peered, partitioning the Internet in the process. We will present an analysis of this particular event: timeline, geographic scope, winners and losers. This event emphasizes the risk of being dependent (transitively single-homed) on a single AS for Internet connectivity. We will take a look at some of the biggest networks and quantify the exposure of their transitive customers to Internet partition events. Martin A. Brown Biography: Martin has been working with IP networking under Linux for more than ten years. As part of the Renesys development team, he works in BGP data analysis. His expertise involves OSS development in systems integration and infrastructure particularly in networking contexts. Former work has involved network security, firewalls, virtual private networks, quality of service and managing and scaling distributed systems. He holds an M.A. in German from the University of Wisconsin, Madison. Clint Hepner Biography: Clint Hepner is a member of the engineering team at Renesys, where he focuses on Interent mapping and event detection. He graduated from Dartmouth College in 2005 with a M.S. in Computer Science. Alin Popescu Biography: Alin Popescu is a member of the engineering team at Renesys. His specialties include implementing statistical and learning algorithms and developing system architectures for BGP data analysis. Before joining Renesys, Alin earned a Ph.D. in Computer Science from Dartmouth College. Archived Files: NANOG45 Abstracts
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