Dynamic Avoidance of Illegal Nodes in Gnutella-like Pure P2P Networks

Pure P2P networks like Gnutella do not have a single point of failure. However, it is possible for an illegal (faulty or malicious) node to alter messages it transmits, so as to make the whole network malfunction. This altered message is forwarded by several nodes, thus it is difficult to identify and to eliminate the illegal node. This paper presents a method to avoid the influence of such illegal nodes by adjusting TTL of packets according to the evaluation of neighboring nodes. We show its effects by several simulation experiments.