Routing table status influence of Monitoring Kad

Kad is the most popular P2P file sharing system. Monitoring Kad peers´ lookup traffic is an important work for the analysis and optimization of Peer-to-Peer (P2P) network. During the monitoring process, we find that the peer´s status significantly influences the monitoring results. Each lookup action changes the searching peer´s routing table status, and it may break the monitoring process. In this paper, we analyze the changes in the routing table to verify its effect on the monitoring process. If the distance between the target ID and searcher´s Kad ID is in within a certain critical range, previous searches may cause future searches to fail with high probability. We estimate the boundary of this critical range. The experiments performed on eMule shows that such a critical range exist, and that deploying more than 1024 IP addresses cannot help to improve the success rate of the monitoring process.