Fast and secure data transmission in MANET

A mobile Adhoc network which is an autonomous system where mobile hosts are connected with each other using multihop wireless link. Nodes can change position quite frequently, which mean the mobility of the network. For quick data transmission, we need a routing protocol that adapts to topology changes. For our convenience, we have proposed a fast and secure protocol which is proactive and reactive in nature. In proactive protocol, routing table updates takes place when the topology changes. In routers that use dynamic routing protocols, it is important to have fast convergence because routers could make incorrect forwarding decisions until the network has fully converged. In proactive protocol, when a new node is added in the network it takes some time to converge during that time if we want to send data to destination through that new node immediately, it takes some time to converge and then it will transmit the data. To avoid this problem we are going to use reactive protocol instead of proactive in that time that is until network converge. In proactive protocol structure, we reduced the packet size and contains only limited field. By this, the total bit size gets reduced. We propose this mechanism to avoid waiting time and to transmit data as early as possible. Also we propose a security mechanism for detecting malicious node by using central agent and process algorithm. The proposed work will be simulated in NS2 simulator.