Walter Willinger

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.

Spatio-Temporal Compressive Sensing and Internet Traffic Matrices

By: 
Yin Zhang, Matthew Roughan, Walter Willinger, and Lili Qiu
Appears in: 
CCR October 2009

Many basic network engineering tasks (e.g., traffic engineering, capacity planning, anomaly detection) rely heavily on the availability and accuracy of traffic matrices. However, in practice it is challenging to reliably measure traffic matrices. Missing values are common. This observation brings us into the realm of compressive sensing, a generic technique for dealing with missing values that exploits the presence of structure and redundancy in many realworld systems.

The Workshop on Internet Topology (WIT) Report

By: 
Dmitri Krioukov, kc claffy, Marina Fomenkov, Fan Chung, Alessandro Vespignani, and Walter Willinger
Appears in: 
CCR January 2007

Internet topology analysis has recently experienced a surge of interest in computer science, physics, and the mathematical sciences. However, researchers from these different disciplines tend to approach the same problem from different angles. As a result, the field of Internet topology analysis and modeling must untangle sets of inconsistent findings, conflicting claims, and contradicting statements.

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