Analysis of On-Demand Routing Protocols under multiple Black hole Nodes

Mobile Ad hoc Network (MANET) is an infrastructure less wireless network of one or more mobile nodes connected by wireless links. These networks do not rely on physical infrastructure so these are easy to deploy where establishment of infrastructure not possible. Rapid improvement in technology may affect the security concerns of the MANET. These networks are vulnerable to various attacks targeting all layers of the protocol stack. One of the major attacks targeting network layer is black hole attack. In this attack, the malicious nodes drop the data packets or forward the packets to the unknown addresses in the network. Many academicians and researchers analyzed the effect of this black hole attack and enhanced the existing protocols to avoid path through malicious nodes in the network. So it is a challenge for researchers in order to improve or enhance security mechanisms already developed or design new efficient security mechanism. In this work, we analysis the performance of on-demand routing protocols under the presence of multiple black hole nodes. We analyzed performance metrics Delay and Throughput. We used Network Simulator version 2(NS2) to carry out the implementations.