حبیب رستمی

In peer-to-peer (P2P) overlay networks, the mechanism of a peer randomly joining and leaving a network, cause a topology mismatch between the overlay and the underlying physical topology. This cause a large volume of redundant traffic in the underlying physical network as well as an extra delay in message delivery in the overlay network. A topology mismatch occurs because overlay networks are not aware of their underlying physical networks. The chord is a P2P overlay protocol used several P2P networks. In this paper, we present a mechanism to enhance efficiency of Chord based P2P network by exploiting the information of the underlying physical network (i.e. TCP/IP). Our mechanism is backed by a theoretical analysis of address space of Chord protocol. Finally, using simulation, we examine the efficiency of proposed mechanisms and show that the mechanism significantly increases efficiency of the Chord protocol