Study of the Rewiring Factor in an Unstructured P2P

Social networking sites allow individuals to communicate and share information. Most of P2P systems assume that all peers cooperate for the benefit of the entire network. However, in practice, there is a significant portion of peers that extract resources from the system without contributing in return. Peer-to-peer applications can benefit from human friendship networks (such as e-mail contacts or instant messaging friend lists). However, these networks are not always available. To this end, we study a protocol, called SLACER (Selfish Link-based Adaptation for Cooperation Excluding Rewiring), that allows peer nodes to create their own friendship networks, through random interactions, producing an artificial social network (ASN) where nodes share high trust with their neighbors. To do so, this paper specifically study P2P networks, which constitute the context for the application of the SLACER protocol; an implementation based on the peersim simulator of the rewiring factor W which represents the possibility of rewiring nodes in a peer network; then our main contribution which is the analysis of simulation results obtained on a larger network size with several values of W; finally we do a performance study by comparative study with SLAC (previous version of SLACER).