The IDS for Securing MANET from Packet Dropping Attack Ghanshyam Rathore Computer Science & Engg. Dept. Indore Institute of Science and Technology Indore,India Prof. Ranjeet Osari Computer Science & Engg. Dept. Indore Institute of Science and Technology Indore,India Abstract—This work analyzes the effect of packet dropping attack through malicious nodes which is probable attacks in ad hoc networks. In this attack, a malevolent node or malicious node impersonates a target node by sending a spoofed route reply packet to a source node which initiates a route discovery. MANET may be unprotected against attacks by the malicious nodes. One of these attacks is the packet dropping Attack against network integrity absorbing all data packets in the network. Since the data packets do not reach the destination by that due to this attack, data loss will occur. The damage will be serious if malicious node in a network working as an attacker node absorbs all data packets delivered through them. In this paper we proposed a simple IDS Algorithm against dropping attack and measure the network performance after applying IDS. We simulated dropping attacks in network simulator 2 (ns- 2) and measured the packet loss in the presence of attacker and in presence of Intrusion Detection System against malicious attack. proposed solution improved the 80% network performance in the presence of a packer dropping attacker. Keywords:- Packet Dropping Attack, IDS, Routing, AODV, Security I. INTRODUCTION The wireless medium has become the newest trend in today's world for data communication. MANET also uses wireless medium for data communication. A Mobile Ad hoc Network (MANET) is the system of infrastructure less or wireless mobile nodes that dynamically constructed in arbitrary and temporary network topologies [1, 2]. Mobile ad hoc networks (MANET) are collection of wireless networks, which consists of huge number of mobile nodes. Nodes in Mobile Ad hoc networks (MANET) can connect and leave the network dynamically. The mobility and scalability of MANET which does not require any fixed network infrastructure, makes it popular for different applications. So, it is very useful for emergency situation like military operation or disaster management [3,4]. By definition, MANET is a collection of mobile nodes equipped with the both wireless transmitter and a receiver which communicate with each other via bidirectional link directly or indirectly. MANET is an autonomous, self configuring network. This network can be deployed anywhere with ease without no support on any fixed infrastructure. There is infrastructure less and centralized administration in this type of networks. Nodes are constant from first to last wireless interface. The dynamic nature of such type of networks makes it highly strung to various link attacks. The essential requirements for a secured wireless networking are secure protocols which certify the discretion, availability, validity, truth of network [5,6]. Many existing safety solutions for wire oriented networks are inefficacious and inefficient for Mobile ad hoc networks (MANET) environment. An ad hoc network is the co-operative environment of a system of mobile nodes which does not required an obstruction of any centralized system. An ad-hoc network is the temporarily established and created network, which is managed and operated by participating nodes. A mobile S sender S node forming a temporary connection in through intermediate nodes to destination D. The node C is out of range to next node due to that the link from that is not possible. Figure1 Ad hoc network Mobile ad hoc network (MANET) is a group or set of mobile nodes which can contact to each other by using multi- hop wireless links. Mobile ad hoc network does not require any centralized management system and fixed network topology of nodes. Mobile ad hoc network is spontaneous, infrastructure or topology less and self organized network. MANET has wide area use because of their self establishment, self creation and self maintenance. Mobile ad hoc network (MANET) is an important part for communication for mobile system. Mobile system or nodes or device in the mobile ad hoc network has a freedom for entry or exit from the network. Mobility reflects the frequently change of network topology. Mobile nodes in the mobile ad hoc network which has the same communication range are said to be the neighboring nodes and neighboring nodes can contact directly to each other. Mobile nodes in MANET can communicate to each other by passing the data and control packets from one node to another node, which are in the same wireless range. Trusted and co-operative behavior of mobile nodes helps in the communication of mobile nodes in the MANET. The mobile Vol. 5 Issue 03, March-2016 International Journal of Engineering Research & Technology (IJERT) ISSN: 2278-0181 http://www.ijert.org IJERTV5IS030853 (This work is licensed under a Creative Commons Attribution 4.0 International License.) Published by : 549