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This paper outlines two novel techniques which can be used in the area of IP geolocation. First the authors introduce a detailed path-latency model to be able to determine the overall propagation delays along the network paths more accurately. This knowledge then leads to more precise geographic distance estimation between network routers and measurement nodes. In addition to the application of the detailed path-latency model, they describe a method which utilizes high-precision one-way delay measurements to further increase the accuracy of router geolocation techniques. The precise one-way delay values are used as a "Path-constraint" to limit the overall geographic distance between the measurement nodes.
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