The use of Peer-to-Peer (P2P) applications is growing dramatically. It concerns applications like Gnutella, Kazaa or eDonkey. These applications sometimes represent as most as 50% of Internet traffic. So, it became important for ISPs to detect these applications. As the TCP port can change, an identification based on TCP gate is not possible. Main goal of this work is to use knowledge about TCP flows on routers (Cisco's NetFlow) to identify P2P users and flows. The paper first presents P2P networks in general and some popular file-sharing systems. It then discusses different techniques to try to measure P2P traffic.
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