Wireless Communication

S. Sowmya ¹, J. Immanuel John Raja ², J. M. Lifna Prema ²

Affiliations
1 Karunya University, Coimbatore-641114, IN
2 Karunya University, Coimbatore, IN

Abstract

A prerequisite for a widespread and successful deployment of ad-hoc networking technology is its ability to provide easy access to the Internet. In this paper, we review the existing solutions to interconnect MANETs with the Internet, but find them lacking in robustness and flexibility. Many methods undergoes with the problem of indirection (i.e., a way to enforce routing through a certain gateway on the path toward a destination in the Internet) and gateway tracking. We analyze the above problems and suggest a solution that provides robust and flexible Internet connectivity. This paper overcomes the problem by using a forwarding strategy, tunneling and also provides dynamically adjusting service which improves MANET flexibility. Simulations show that, when used in combination with AODV routing, our solution provides up to 25% delivery ratio improvement.

Keywords

AODV, MANET, Gateway, Tunneling.

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J. Jeba Veera Singh , A. Alfred Raja Melvin , J. Immanuel John Raja ¹

Affiliations
1 Department of Computer Science and Engineering, Karunya University, IN

Abstract

Mobile ad-hoc networks (MANETs) will be formed where a fixed network is not possible to be maintained. MANETs are infrastructure less and will be having mobile nodes. Security in mobile ad hoc networks is difficult to achieve, because of the dynamic topologies, limited resources, the absence of a certification authority and the lack of a centralized monitoring point [1]. MANETs are vulnerable to many kinds of attacks. Most of the attacks are routing protocol attacks. The routing protocol attacks will be carried out by forming holes in the network. The holes in the network can drop, tamper or fabricate the traffic in the network. The holes or the malicious nodes should be detected and detached as early as possible. The detection mechanism should also guarantee higher detection rate and lesser traffic. In this paper we propose a robust technique to detect the holes in the MANET which uses reactive routing protocol.

Keywords

MANET, Sinkhole Nodes, Routing Attacks, Bogus RREQ, Cross-Over Error Rate.

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J. M. Lifna Prema ¹, J. Immanuel John Raja ¹, S. Sowmya ¹

Affiliations
1 Karunya University, Coimbatore 641114, IN

Abstract

The dynamic and cooperative nature of ad hoc networks presents considerable challenges in securing and detecting attacks in these networks. A security attack, called the wormhole attack, has been introduced in the context of ad-hoc networks. During the attack, a malicious node captures packets from one location in the network, and tunnels them to another malicious node at a distant point. Wormhole nodes can grab the route from the source node to the destination node, then it drop, or sniff the packets. A wormhole attack poses various threats and it is difficult to prevent. Many techniques have been evolved to detect wormhole attack. This paper presents a survey of various techniques used to detect wormhole attacks. Based on the metrics like packet loss rate, Throughput and Detection rate a comparative study is also done.

Keywords

Mobile Ad hoc Network, Wormhole Attack.

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