摘要：A mobile ad hoc network (MANET) is a self-created self-organized and self-administering set of nodes connectedvia wireless links without the aid of any fixed infrastructure or centralized administrator.Protecting the network layer frommalicious attacks is an important and challenging issue in bothwired and wireless networks and the issue becomes even morechallenging in the case of MANET. In this paper we propose a solution of umpiring system (US) that provides security forrouting and data forwarding operations.Umpiring system consist of three models, are single umpiring system (SUS), doubleumpiring system (DUS), and triple umpiring system (TUS).In our system each node in the path from source to destination hasdual roles to perform: packet forwarding and umpiring.US does not apply any cryptographic techniques on the routing andpacket forwarding message. In the umpiring role, each node in the path closely monitors the behavior of its succeeding nodeand if any misbehavior is noticed immediately flags off the guilty node. For demonstration, wehave implemented the umpiringsystem by modifying the popular AODV protocol
