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Our Core Technology
A collection of relevant papers we wrote in our core technology field.
IP Geo Location

The geographical location of Internet IP addresses is important for academic research, commercial and homeland security applications. While commercial databases claim to have a very high level of accuracy, the correctness of their databases is questionable.

Academic tools, based on delay measurements, were shown to have a large range of error. We pre...

The geographical location of Internet IP addresses is important for academic research, commercial and homeland security applications. Thus, both commercial and academic databases and tools are available for mapping IP addresses to

geographic locations.

Evaluating the accuracy of these mapping services is complex since obtaining diverse large scale gro...

The paper introduces a novel structural approach to automatically generate large scale PoP-level maps of the Internet using a large scale distributed traceroute measurement campaign.

The PoPs are first identified based on their structure, and then are assigned a location using information from multiple sources. Using this approach, we could evaluate...

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AS Type of Relationship

The Internet is a complex network, comprised of thousands of interconnected Autonomous Systems. Considerable research is done in order to infer the undisclosed commercial relationships between ASes.

These relationships, which have been commonly classified to four distinct Type of Relationships (ToRs), dictate the routing policies between ASes. These...

The discovery of Autonomous Systems (ASes) interconnections and the inference of their commercial Type of Relationships (ToR) has been motivated by the need to accurately calculate AS-level paths. An inherent problem in current algorithms is their extensive use of heuristics, causing unbounded errors that are spread over all inferred relationships....

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Distributed Monitoring

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 countr...

—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. Difficul...

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 des...

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...

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...

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 mirro...

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Network Performance Analysis
Network Performance Analysis

Many Internet events exhibit periodical patterns. Such events include the availability of end-hosts, usage of internetwork links for balancing load and cost of transit, traffic shaping during peak hours, etc. Internet monitoring systems that collect huge amount of data can leverage periodicity information for improving resource utilization. However,...

The end-to-end (e2e) stability of Internet routing has been studied for over a decade, focusing on routes and delays. This paper presents a novel technique for uncovering the origins of delay variations by measuring the overlap between delay distribution of probed routes, and how these are affected by route stability.  

         Evaluation is perform...

The diversity of end-to-end (e2e) Internet routes has been studied for over a decade, dating back to Paxson’s seminal work from 1995. This paper presents a measurement study of this issue and systematically evaluate the diversity of the Internet routes, while revisiting some of the conclusions previously made. Two large scale experiments are used fo...

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