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The major turmoils in the Arab world since the beginning of 2011 were largely driven by social networks and are often referred to as the “Arab Spring.” One of the methods used by rulers to mitigate the unrest is “shutting down” the Internet in their country. In this article we describe active measurements conducted during 2011 of several Arab countries, and analyze the changes in the...

—The topology of the Internet has been extensively studied in recent years, driving a need for increasingly complex measurement infrastructures. These measurements have produced detailed topologies with steadily increasing temporal resolution, but concerns exist about the ability of active measurements to measure the true Internet topology. Difficulties in ensuring the accuracy of ev...

There is a long line of research on measuring the Quality of Service (QoS) path characteristics of the Internet, such as available bandwidth, path capacity, packets reordering, delay and jitter. Most of the measurement techniques are based on active probing using pairs or trains of packets. The packets are either transmitted back-to-back or at a desired spacing (e.g., to achieve a ce...

Today’s Internet maps, which are all collected from a small number of vantage points, are falling short of being accurate. We suggest here a paradigm shift for this task. DIMES is a distributed measurement infrastructure for the Internet that is based on the deployment of thousands of light weight measurement agents around the globe. We describe the rationale behind DIMES deployment,...

Distance estimation is important to many Internet applications. It can aid a World Wide Web client when selecting among several potential candidate servers, or among candidate peer-to-peer servers. It can also aid in building efficient overlay or peer-to-peer networks that dynamically react to change in the underlying Internet. One of the approaches to distance (i.e., time delay) est...

There is an increasing need to quickly and efficiently learn network distances, in terms of metrics such as latency or bandwidth, between Internet hosts. For example, Internet content providers often place data and server mirrors throughout the Internet to improve access latency for clients, and it is necessary to direct clients to the nearest mirrors based on some distance metric in...

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