Provider Portal for Applications (P4P) is a model aiming to incorporate (peer to peer) P2P applications with Internet Service Providers (ISPs) and improve the performance of the both ISP and the P2P applications. In this study, we have analyzed the relationship between the link trac and the P-distance, which is the core interface of P4P. In addition, the limitation of P4P in dealing with network applications having bottleneck links is illustrated. Furthermore, taking link utility function as the
