Performance Evaluation of MANET Routing Protocols with Scalability for E-mail Network Delay Using OPNET Modeler

Mobile ad hoc network is a collection of wireless nodes that can dynamically be set up anywhere and anytime to exchange information without using any pre-existing network infrastructure. It is a self organized and self configurable network where the mobile nodes move randomly. In MANET mobile nodes can receive and forward packets as a router and each node operates not only as an end system, but also as a router to forward packets. The nodes are free to move i.e. the nodes are mobile. These nodes change position frequently. So there is no fixed infrastructure, which results in addition and exclusion of any number of nodes from the network for relatively small networks routing protocols may be sufficient. However, in larger networks either hierarchical or geographic routing protocols are needed. In this Thesis three routing protocols AODV (Ad-Hoc On-Demand Distance Vector), OLSR (Optimized Link State Routing Protocol) and DSR (Dynamic Source Routing Protocol) are compared. Most of the previous research on MANET routing protocols have focused on simulation study by varying various parameters, such as network size, pause times etc. The performance of these routing protocols is analyzed with Scalability for E-mail in terms of their Network Delay and their results are shown in graphical forms. The comparison analysis will be carrying out about these protocols and in the last the conclusion will be presented, that which routing protocol is the best one for mobile ad-hoc networks.