Routing in Manets

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Routing in MANETs: Proactive vs Reactive
Chigbogu Samuel Nwanjah K1161430
Network Security Coursework Network and Information Security January/February 2012, Abstract – This report aims at presenting an evaluation of Proactive and Reactive routing protocols using some performance statistics as it applies to Mobile Ad hoc NETworks (MANETs). This report also presents an evaluation of these protocols based on the result of the simulations carried out as part of this work. The simulations were done using ViSim (a visual MANET simulator). But first, the concept of MANET is described which includes its modus operandi. The theories behind the routing protocols are also briefly presented. The report is concluded with recommendations based on the analysis of the simulation results. Reactive routing protocols with focus on the particular routing protocols that will be used for the simulation; Section 4 presents the simulation software and a description of the scenario that was simulated; Section 5 presents the analysis of the simulation results; and the conclusion is presented in Section 6.

MANETs are made up of independent nodes that can relate directly with each other through a collaborative communication scheme. MANETs are developed to be deployed in situations or places where there are no communication infrastructures. MANETs can also be deployed at locations with communication infrastructures that have been saturated due to emergency situations. MANETs deployed in such scenarios are termed as emergency MANETs – eMANETs [1]. For a typical MANET communication cycle, the node that needs to send a message must be linked to the recipient either directly or through intermediate nodes. These intermediate nodes act as mobile routers (in a multi-hop pattern) in scenarios where the sending node cannot directly connect to the recipient node. It does not necessarily mean that the role a particular node plays in one communication cycle determines the role it will play in another communication cycle. The roles played by any component node are determined by the need of its peers in the MANET. The dynamic nature of a MANET is characterised by its unpredictability and scalability [2]. It is unpredictable in the sense that, resources in one of its node are lost in the

With the evolution of MANETs, several implementations of proactive and reactive routing protocols have been proposed for use. This is because the existing routing protocols (which were designed for fixed network topologies) were not suitable for the MANET topology. As these protocols are published, they boast of having some promising advantages over the previously existing ones. It is of common knowledge in the research community that one protocol can be preferred over the other depending on the prevalent features of the target MANET. This is the main reason why researchers have proposed various hybrid techniques with the aim of leveraging on the strengths of both kinds of routing protocols. The Hybrid protocols are not described in this report. The remainder of the report is organised as follows: Section 2 presents the concept behind MANETs; Section 3 talks about Proactive and

Routing in MANETs: Proactive vs Reactive

MANET as soon as the node gets down. It is scalable in the sense that the size of the MANET depends on just the addition or withdrawal of a node. The following differences between a MANET architecture and a conventional network architecture will further explain how MANETs work. 1. MANET messages are routed at the topmost layer (application layer) by the component nodes while messages in the Client-Server architecture are routed at the network layer. 2. In the Client-Server architecture, the resources been shared are placed in the server; clients have to connect to the server to make use of these resources. In the MANET architecture, this is not the case since all the nodes...
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