Using BitTorrent for Measuring End-To-End Internet Path Characteristics
نویسنده
چکیده
This report presents BitProbes, a system utilizing participants in peer-to-peer systems as targets for measuring the link characteristics of Internet end hosts. By connecting measurement nodes to popular swarms of the widely used peerto-peer system BitTorrent, it is showed that properties of BitTorrent make users of it well suited as targets for Internet measurements. The design and implementation of a system for large scale end host measurement is presented. The system is capable of measuring the upload capacity and link latency of end hosts as well as recording the path to the host. The report also includes the design of a probing tool that can measure the download capacity of end hosts in what looks like a BitTorrent application level handshake. This tool exploits TCP-packet reordering to disable delayed acknowledgements on remote hosts. An early version of BitProbes is then evaluated on PlanetLab to verify both potential coverage and usability of results. A later version is currently running at 8 dedicated machines in a server cluster at the University of Washington, covering roughly half a million end-hosts per week. The measurements are stored in a database accessible by the iPlane, a system developed at the University of Washington that provides predictions about Internet path performance. With the addition of end-host measurements, the iPlane is able to predict the properties of the link between two arbitrary end hosts. Mäta egenskaper hos Internetanslutningar genom att utnyttja BitTorrent
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