Paul Barford

InterTubes: A Study of the US Long-haul Fiber-optic Infrastructure

By: 
Ramakrishnan Durairajan, Paul Barford, Joel Sommers, Walter Willinger
Appears in: 
CCR August 2015

The complexity and enormous costs of installing new longhaul fiber-optic infrastructure has led to a significant amount of infrastructure sharing in previously installed conduits. In this paper, we study the characteristics and implications of infrastructure sharing by analyzing the long-haul fiber-optic network in the US. We start by using fiber maps provided by tier-1 ISPs and major cable providers to construct a map of the long-haul US fiber-optic infrastructure.

Network Discovery from Passive Measurements

By: 
Brian Eriksson, Paul Barford, and Robert Nowak
Appears in: 
CCR October 2008

Understanding the Internet's structure through empirical measurements is important in the development of new topology generators, new protocols, traffic engineering, and troubleshooting, among other things. While prior studies of Internet topology have been based on active (traceroutelike) measurements, passive measurements of packet traffic offer the possibility of a greatly expanded perspective of Internet structure with much lower impact and management overhead. In this paper we describe a methodology for inferring network structure from passive measurements of IP packet traffic.

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