School Of Engineering And Technology

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    Prevention of Denial of Service Attack on Dynamic Source Routing VANET Protocol.
    (IJRET, 2015) Rani, Komal; Mittal, Meenakshi
    Vehicular Ad Hoc Network (VANET) is a kind of Wireless Ad hoc Network in which node has high mobility, and thus the topology of the network is highly dynamic. VANET has thepotential to increase road safety, improve traffic efficiency as well as comfort to both drivers and passengers. There are different types of attacks possible on VANET. In this paper, implementation and prevention of DOS attack is done on topology based protocol- Dynamic Source Routing (DSR). The performance of DSR protocol is evaluated under different scenarios using Network Simulator (NS2), Simulation of Urban Mobility (SUMO) simulator and Mobility model generator for Vehicular networks(MOVE). The prevention scheme Queue Limiting Algorithm (QLA) proposed by Sinha & Mishra is implemented to prevent Denial of Service attack. The results show that DSR has high throughput and packet delivery ratio at low density of nodes and the value of these parameters become low at high density of nodes. The prevention scheme is capable to prevent DOS attack.
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    Effect of improved IEEE 802.11 DCF on the performance of manets
    (Central University of Punjab, 2014) Hans, Shifali; Sood, Neha
    Wireless networks have become the most crucial aspect of the today's wireless communication and information exchange. The rapid advancements in the wireless networking technologies have drastically modified our communication and networking world and have led us to the new direction of 'Infrastructure-less networking i.e. Mobile ad hoc Networks'. Mobile ad hoc networks (MANETs) are the wireless infrastructure less networks that do not require any sort of central access point. Nodes in MANETs are connected by the wireless links and they are free to move arbitrarily in any direction. The attractive features of MANETs help to set up a network in emergency situations where the infrastructure is not available or not possible. Even though MANETs have emerged to be attractive, and they hold great promises for our future, but there are several challenges that need to be addressed. The wireless medium is the open shareable; so many-a-times nodes compete among themselves for the medium access, and the conflict arises. In order to resolve the medium contention among nodes there are medium access control techniques. IEEE 802.11 DCF is the de-facto medium access protocol. However there are some problems in IEEE 802.11 DCF which need to be attended for the better MANET performance. The objective of the dissertation work is to study the IEEE 802.11 DCF performance. The performance of 802.11 have been deduced and analysed by running a simulation in NS2 and then have been comparing to the performance of the modified IEEE 802.11 DCF with AODV and DSR routing protocol.