Thèse soutenue

La topologie de l'Internet vue par les applications
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Auteur / Autrice : Mohammad Malli
Direction : Chadi BarakatWalid Dabbous
Type : Thèse de doctorat
Discipline(s) : Informatique
Date : Soutenance en 2006
Etablissement(s) : Nice
Ecole(s) doctorale(s) : École doctorale Sciences et technologies de l'information et de la communication (Sophia Antipolis, Alpes-Maritimes)

Résumé

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We introduce in this thesis the notion of CHESS, an application-aware space for enhanced scalable services in overlay networks. In this new space, the proximity is a function of network parameters (e. G. , delay and bandwidth) that decide ion the application performance. We motivate the need for this new notion by showing that the network parameters are slightly correlated. Then, we consider two typical applications : a file transfer running over the TCP protocol, and an interactive audio service. For each application, we first propose a metric that models the application quality by considering the critical network parameters (e. G. , delay, bandwidth, loss rate) affecting the application performance? Then, we evaluate the enhancement of the performance perceived by peers when they choose their neighbours based on the proximity in CHESS instead of the delay-based one determined using the proposed utility functions. Our major contribution is a model for interring the bandwidth among peers in an easy and scalable manner. It consists of estimating the bandwidth among peers using the bandwidth on the direct paths that join them via a set of well defined proxies or relays that we call landmark nodes. Our idea is that an indirect path shares the same tightest link with the direct path or any of the two peers subject to bandwidth interference. We evaluate the impact of the location, number, and distribution of the landmarks on the bandwidth estimation accuracy. We obtain, that the proximity in CHESS, which is determined using our bandwidth estimation model, provides much better quality that obtained using the delay proximity for large field transfer applications. The whole study us supported by extensive measurements carried out over the worldwide experimental network Planetlab.