International Journal on Recent and Innovation Trends in Computing and Communication ISSN: 2321-8169 Volume: 1 Issue: 9 735 – 739 ____________________________________________________________________________ IJRITCC | September 2013, Available @ http://www.ijritcc.org 735 ____________________________________________________________________________________________ Abstract —The work presented here is a summary of the results obtained when routing protocols viz. AODV, DSR, DYMO were simulated using virtual hosts on a discrete-event simulator: OMNeT++ v4.2.1. The three protocols are run on a simulation setup of 20 nodes without any mobility models. This allows us to focus our attention on solely the MAC properties and related results derived from the three protocols. We describe and compare the three routing protocols on available parameters like contention window, SNIR, routing overhead, radio state and more. We conclude by stating the DYMO emerges as the better protocol of the three examined here. Keywords—MANET, Routing Protocols, OMNeT++, network simulation, AODV, DSR, DYMO. I. INTRODUCTION In our advent into the world of network simulation, we have chosen to taken up a subject, which is in the center of many important developments in the modern world. Wireless communication has seen its boundaries extended with the addition of ad-hoc mode capabilities. It is our intent to contribute, in our own small way, to this growing pool of knowledge. Using a simulation technique allows one to analyze network protocols large scale – subject to available computing power. There are a huge number of simulation tools available. In this case study, we focus on OMNeT++. The paper goes on to describe various aspects regarding routing protocols used in mobile ad-hoc networks. Section 2 describes OMNeT++ in its various features and its relevance with the network simulation space. Section 3 lists out the simulation setup used, and describe the different hardware and software parameters of the simulation workbench. Section 4 and 5 analyze the results obtained, while drawing some conclusions. Finally, the paper end with a look at future steps in the direction and list of works referenced which were helpful in guiding us in our work. II. OMNET++ A. Introduction OMNeT++ is a simulation environment free for academic use. The OMNeT++ engine runs discrete, event-driven simulations of communicating nodes on a wide variety of platforms and is becoming increasingly popular in the field of network simulation. OMNeT++ is an extensible, modular, component-based C++ simulation library and framework, primarily for building network simulators. "Network" is meant in a broader sense that includes wired and wireless communication networks, on- chip networks, queuing networks, and so on. Domain-specific functionality such as support for sensor networks, wireless ad- hoc networks, Internet protocols, performance modeling, photonic networks, etc., is provided by model frameworks, developed as independent projects. OMNeT++ offers an Eclipse-based IDE, a graphical runtime environment, and a host of other tools. There are extensions for real-time simulation, network emulation, alternative programming languages (Java, C#), database integration, SystemC integration, and several other functions. A hierarchy of small represents scenarios in OMNeT++, reusable modules written in C++. OMNeT++ supports behavioral modeling of modules using finite state machines and communication within and between modules is primarily based on message passing, but the foundation in open source software written in C++ also allows for a rapid prototyping approach to module development. Modules’ relationships and communication links are stored as plain-text Network Description (NED) files and can be modeled graphically. Simulations are either run interactively in a graphical environment or are executed as command-line applications. B. INET Framework The INET Framework extension is a set of simulation modules released under the GPL. It provides OMNeT++ modules that represent various layers of the Internet protocol suite, e.g. the TCP, UDP, IPv4, and ARP protocols. The INET Framework A Comparative Study of AODV, DSR, and DYMO routing protocols using OMNeT++ Nitin Kumar 1 , Kunj Vashishtha 2 , Kishore Babu 3 1 Asst. Professor, Department of Electronics, SRM University, NCR Campus, Ghaziabad [U.P] INDIA 2 Student, B.Tech, Department of Electronics, SRM University, NCR Campus, Ghaziabad [U.P] INDIA 3 Student, B.Tech, Department of Electronics, SRM University, NCR Campus, Ghaziabad [U.P] INDIA nitindhama85@gmail.com kunjvas@hotmail.com kishore.babu@gmx.com