P4P Node Selection Algorithm Based On Comprehensive Priority

With the rapid development of the Internet,P2 P network has been deep into many aspects of the Internet life.Netizens like to use it for communication and sharing resources.Growth of scale of P2 P network brought about an increase of the amount of P2 P traffic is amazing.P2 P brings convenience,but it also make the network provider feel headache.The main problem lies in the "equivalence" of the P2 P network switching mode.Because the P2 P network is mapped to the overlay network and selects peers on the overlay network,it ignores the distance of the actual geographical position of peers.It cause the neighbors which the peer select often appear in the far distance.Under this situation, P2 P network will consume a large amount of network bandwidth,make The whole network overload,reduce network efficiency,increase the maintenance cost of network provider.P4 P means proactive network provider participation for P2 P.The network provider offers an interface that can be aware of the net work topology.and p2 p applications can use this interface to optimize their node select algorithm.the purpose of the P4 P is In order to improve network efficiency, reduce operating costs, enhance the user's perception.1.Based on the study of P4 P system,this paper put forward DPI-based P4 P architecture.An IP address information database is designed for providing data support to node selection algorithm. The DPI system collects information such as the administrative division of IP addresses for maintaining the IP address information database.2.Based on the consideration of ISP on operation cost and traffic localization,a comprehensive priority based node selection strategy is proposed.The strategy use the information in the IP address information database to compute a priority values for every IP address from the IP_List that App Tracker searched.App Tracker selects the nodes as a list according to the priority value for the request node.Combined with the consideration of ISP resource selection,we designed three node select strategy whatbaed on comprehensive priority:The Same Network Preferred,The Same Country Preferred and The Same Province Preferred.3.A P4 P node selection algorithm based on comprehensive priority is proposed, and the node selection strategy based on comprehensive priority is applied to the algorithm.The algorithm is implemented on the Peersim simulation platform.Through the comparison and verification, this algorithm is more efficient than the original BT protocol in terms of improving local traffic and limiting the traffic between different ISP.