ISSN (Online) 2278-1021 ISSN (Print) 2319-5940 International Journal of Advanced Research in Computer and Communication Engineering Vol. 4, Issue 2, February 2015 Copyright to IJARCCE DOI 10.17148/IJARCCE.2015.4299 438 Remote login based traffic Performance Analysis of Reactive Routing Protocols of MANETs using OPNET Gurbhej Singh 1 , Gurjeet Singh 2 Assistant Professor, Department of Computer Science & Engineering, SBSSTC, Ferozepur, India 1,2 Abstract: In MANET routes between nodes changes regularly due mobile nature of all network nodes. It is always challenging task to discover an optimal path. Due to change in network topology some parameters are also effected like network delay, packet drop and throughput etc. There are basically three categories of protocols are reactive, proactive and hybrid. But reactive protocols have wide popularity in this field and provide solution to overcome problems (change in parameters) related to adhoc network. This paper evaluates behaviour of reactive protocols (AODV, DSR) using remote login type traffic in MANET. In this paper some parameters like network delay, total packet drop, network load and throughput are calculated with help of OPNET Modeller 14.5. Keywords: OPNET, MANET, AODV, DSR and Remote login I. INTRODUCTION MANET is mobile Adhoc network[1,5]. MANET is self- organising group of mobile users which interact with each other with the help of wireless network. MANET consists of number of mobile hosts such as laptops, tablets or mobile with radio interface between them. The interface between hosts is not permanent. The route between them is dynamic that means it change the topology every time, while making connection with other nodes. In adhoc network nodes also act as router that transmit and receive data from other nodes in network. Routing between nodes is very critical issue and there is need to evaluate protocol to make a network reliable. In adhoc network there are two basic routing techniques. First one is proactive and second is reactive routing. Proactive routing is based on the formula that routing protocol makes decision to get router, when there is need to transmit packet. In proactive protocol routes of packet changes very quickly before reaches to destination due to change in topology. DSDV and WRP protocol are example of proactive routing. Reactive routing selects route according to the requirement. When there is a packet to transmit, protocol selects routes a suitable route from source to destination nodes and this route remain unchanged before reaching the destination node. AODV, DSR are example or reactive protocol. II. REACTIVE ROUTING PROTOCOLS 2.1 Dynamic source routing protocol (DSR)- DSR is reactive routing protocol.[8,10] This protocol is purely on-demand routing protocol. Every node has cache memory which is used to stored possible paths between source and destination. In DSR node can store more than one route in cache memory. Source node can check and validate route before starting the transmition. DSR updates cache of node by discovering new routes. The new routes are added in cache if there exist a direct path from source to destination node. When source node has data to transmit over the network towards destination then it defines route. The transmitting data will follow same route in network. There is no need of „hello message‟ exchange between nodes so nodes remains in sleep mode and consume very less energy. In DSR small portion of bandwidth is used. In this protocol source node multicast routing request (RREQ). This request includes source identification (SID), destination identification (DID), and unique request sequence number called Request ID (RID). a). Routing Discovery Process in DSR: This mechanism is used to discover path from source to destination. b). Route Maintenance in DSR: This mechanism take cares of connection after transmition start. Maintenance checks lost of packet and error in data etc 2.2 Adhoc On-demand Vector Routing protocol (AODV)- AODV is also a reactive protocol. AODV use control message to discover route from source to destination before starting transmition. In AODV source node sends request message to all its neighbours. This process is followed until destination is reached or time expired. If destination reached then destination node make reply to source node. In this process route discovered and route is used to transmit data.[7,9] III. SIMULATION SETUP In this paper our motivation is to analyze behaviour of reactive routing protocols (AODV, DSR).For evalution of AODV and DSR OPNET 14.5 Simulator[6,10] is used. The network area is taken 2000m*2000m. The mobile nodes are spread over this area of interest or network area. The numbers of mobile nodes are different for two cases. In first case numbers of mobile nodes are 25 and 50 for second case. The time for simulation is taken as 600 seconds and traffic used to simulation is remote login. Remote login application and profile is configured in this paper. The network is wireless LAN for mobile nodes having a data rate of 11Mbps and random waypoint mobility model used in this simulation. DES‟s (global discrete event statistics) are collected on both protocols