Ankur Sharma et al. Int. Journal of Engineering Research and Application www.ijera.com ISSN : 2248-9622, Vol. 3, Issue 5, Sep-Oct 2013, pp.676-681 www.ijera.com 676 | Page Experimental Analysis of OLSR Routing Protocol and Performance Evaluation Using NS-2 Simulator Ankur Sharma 1 , Er. Rakesh Kumar 2 1 (Department of Computer Science and Engineering, Sant Baba Bhag Singh Institute of Engineering & Technology-Punjab Technical University, India) 2 (Department of Information Technology, Sant Baba Bhag Singh Institute of Engineering & Technology- Punjab Technical University, India) ABSTRACT Mobile ad hoc networks (MANETs) is a collection of wireless moving nodes which communicate with each other and exchange data without any fixed base station or without the need of any kind of wired backbone network. These design characteristics make routing in wireless network a critical issue as routing protocols adopted in wireless network is completely different from wired network in which a backbone router determines the routing path. In this paper we discussed a OLSR routing protocol for routing path determination as well as we measured the various performance oriented parameters using NS2 simulator. During the research implementations, we also use trace graph, a open source tool for generation of graphs of various statistics such as end to end delay, jitter, throughput etc. This study presents the sequence of steps which highlight the adoption of OLSR routing based on the number of nodes and statistics generated in simulation environment. Keywords – MANET, OLSR, NS2, Throughput, Delay, Packet Delivery Ratio I. INTRODUCTION A Mobile Ad-Hoc Network (MANET) [1] is the network which contains the mobile nodes which send and receive packets from other nodes through a wireless link as there is no dedicated fixed link between wireless nodes. They can communicate each other directly or with the help of a node which is acting a router between wireless nodes. There is no pre-existing infrastructure or dedicated base station in case of wireless network. Due to mobility of nodes, network topology of MANET may change dynamically without turning to any existing centralized administration [2]. Though wireless systems have existed since the 1980’s it is only in recent times that wireless systems have started to make inroads into all aspects of human life. Mobile Ad Hoc Networks (MANETs) are advanced wireless communication networks. Mobile Ad hoc Network is an autonomous system of mobile nodes connected by wireless links. Each node operates as an end system and a router for all other nodes in the network. A mobile Ad hoc Network is a self configuring network of mobile routers connected by wireless links –the union of which forms an arbitrary topology. An Ad hoc network is often defined as an “infrastructure less” network means that a network without the usual routing infrastructure, link fixed routers and routing backbones. [3] 1.1 Properties of MANET Network Wireless ad hoc networks are formed by a group of mobile users or devices spread over a certain geographical area. The user or devices forming network “nodes”. The service area of the ad hoc network is the whole geographical area where nodes are distributed. As mobile ad hoc networks are self organized networks communication in ad-hoc networks can generate data for any other node in the networks. The multi hop support makes communication between nodes outside the direct range of each other possible. 1.2 Some Issues in MANET Network An ad hoc network is a dynamic type of network with similarities and great differences to its parent fixed communication network. The properties of an ad hoc network will define its shortcomings and highlight security challenges [4] [5] [6] [7] [8] [9].An ad hoc networks, is a spontaneous, self created network which cannot rely on a fixed network infrastructure, and by definition does not. A fixed entity structure such as a base station or central administration is crucial for security mechanisms. The trusted third party member who is expected in traditional networks often defines security services; the absence of such a control entity introduces new opportunities for security attacks on the network. The network instead of relying on a central administrator for network and security service, the network relies upon the nodes for these duties in a self-organized manner. Connectivity is a problem in ad hoc networks as networks are created spontaneously and nodes are mobile. Therefore connectivity between the nodes is sporadic. In ad hoc networks nodes may have no prior relationships with other nodes within RESEARCH ARTICLE OPEN ACCESS