2009 IEEE International Advance Computing Conference (IACC 2009) Patiala, India, 6-7 March 2009 Reliable AODV Protocol for Wireless Ad Hoc Networking Ashwin Perti Pradeep Sharma Sr. Lecturer, Associate Professor Department of Information technology, Department of Information Technology, Academy of Business and Engineering Academy of Business and Engineering Sciences, Ghaziabad Sciences, Ghaziabad ashwinperti Dabes.ac.in pksharma26 &,)redif co Abstract- The recent advances in wireless technologies and military, police and rescue agencies; especially in ubiquitous computing have driven an immense disorganized or hostile environments. However, interest in mobile ad hoc networks (MANETs). many challenges, including security and quality However, the performance of MANETs is highly of service (QoS), must be addressed in order for affected by the behaviour of its constituting MANETs to become a reliable and practical mean nodes, which must cooperate in order to provide of communication. Since MANETs rely on its the basic networking functionality. So to remove constituting nodes to provide the necessary the problem of misbehaving node affecting the networking functions; the presence of behavior of MANET, We present a solution that misbehaving nodes paralyzes most network detects and avoids misbehaving nodes, which functions. QoS performance is particularly agree to route packets for other nodes and degraded because of these misbehaving nodes. subsequently drop these packets. Such We propose and implement a solution, which will misbehaviour is of direct effect on Quality of detect and avoid misbehaving nodes under Service (QoS) solutions, namely the QoS goodput different variations of MANET environments. metric. The solution takes a transparent layered Experimentation results show that the RAODV approach and assumes no security constraints. consistently detects and avoids misbehaving The solution was simulated using NS2. nodes in MANETs under various hostility Experiments were done using multiple variations degrees, traffic loads and mobility scenarios. The of mobile ad hoc environments, according to the RAODV improves the QoS goodput (data hostility degree, mobility scenario and traffic delivery ratio) in all hostile environments and load. The experimentation results show that the incurs acceptable routing overhead. Besides the solution consistently detects and avoids lack of infrastructure and central authority, the misbehaving nodes leading to improved goodput pivotal role played by mobile nodes in creating, by up to 25%. organizing and administering of MANETs places Keywords: Misbehaving Nodes, Mobile Ad-Hoc great importance on the quality of the Networks, Quality of Service, Routing participating nodes. The presence of misbehaving I. INTRODUCTION nodes greatly affects the integrity and Mobile ad hoc networks (MANETs) are the performance of the network. The effect is more prolific product of the new "ubiquitous mobile drastic in environments where QoS is of computing" paradigm. Mobile systems use importance. QoS performance is directly affected wireless technology for transparent self-organized by the quality of the nodes participating in the communication. Unlike conventional wireless QoS provisioning process. Current QoS solutions networks, MANETs are self-creating, self- are mostly intended for operation in a safe trusted organizing and self-administering. Mobile nodes environment, they implicitly assume the freely join and leave the network and self- participating nodes to be cooperative and well organize into arbitrary and temporary network behaved [5, 6]. Such an assumption is not valid in topologies, allowing people and devices to most realistic environments. MANETs' flexibility seamlessly and instantly inter-network in areas and lack of central authority allow any node, without any pre-existing communication including malicious and un-cooperative (selfish) infrastructure. Nodes are both hosts and routers: nodes, to easily join the network. Protecting the they transiently associate with peers that are performance of QoS solutions in such within their connectivity range and implicitly environments becomes extremely important. agree to provide the basic network functions. The Incorporating wholesome security solutions unique benefits and flexibility offered by within QoS frameworks rather complicates the MANETs elicited immediate interest among already non-trivial process of QoS provisioning. 978-1-4244-2928-8/09/$25 .00 ( 2009 IEEE 675