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Many measurement studies are showing that peer-to-peer (P2P) file sharing applications have evolved to become a major traffic source in the Internet. The ability to quantify their impact on the network is fundamental for network managers, who have to guarantee a satisfactory service level to their customers. We present here a scalable simulation model, which aims at providing useful criteria in the capacity planning of Internet access links for enterprise networks, by considering the important effects of P2P file sharing traffic. Results are reported, along with a measurement study of real traffic traces, which confirms the validity of the model and its findings.