ICTACT Journal on Communication Technology

S. Rajeswari ¹, Y. Venkataramani ¹

Affiliations
1 Department of Electronics and Communication Engineering, Saranathan College of Engineering, IN

Abstract

In Gossip Sleep Protocol, network performance is enhanced based on energy resource. But energy conservation is achieved with the reduced throughput. In this paper, it has been proposed a new Protocol for Mobile Ad hoc Network to achieve reliability with energy conservation. Based on the probability (p) values, the value of sleep nodes is fixed initially. The probability value can be adaptively adjusted by Remote Activated Switch during the transmission process. The adaptiveness of gossiping probability is determined by the Packet Delivery Ratio. For performance comparison, we have taken Routing overhead, Packet Delivery Ratio, Number of dropped packets and Energy consumption with the increasing number of forwarding nodes. We used UDP based traffic models to analyze the performance of this protocol. We analyzed TCP based traffic models for average end to end delay. We have used the NS-2 simulator.

Keywords

MANET Routing Protocol, Delivery Ratio, Energy Consumption, Reliability.

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S. A. Arunmozhi ¹, Y. Venkataramani ¹

Affiliations
1 Department of Electronics and Communication Engineering, Saranathan College of Engineering, Tamil Nadu, IN

Abstract

Defending against denial-of-service attacks (DoS) in a mobile ad hoc network (MANET) is challenging because of the dynamic network topology. Security primitives must be dynamically adjusted to cope with the network. The Reduction-of-Quality (RoQ) Distributed Denial of Service (DDoS) attack is one which throttles the tcp throughput heavily and reduces the quality-of-service (QoS) to end systems gradually rather than refusing the clients from the services completely. Supporting QoS in MANET is a challenging task, particularly in the presence of malicious users. In this paper, we propose a DoS resilient technique that uses a flow table to detect the attackers. The proposed defense mechanism identifies the attackers based on the congestion bit notification and asks the sending node to reduce the sending rate. Once the attackers are identified, all the packets from those nodes will be blocked. The throughput and delay performance of TCP or UDP flows are very sensitive to such RoQ attacks. Through extensive ns2 network simulations, we demonstrate the achievement of high throughput and low delay for a network under the RoQ attack.

Keywords

MANET, Network Security, Distributed Denial of Service Attack, Reduction of Quality Attack.

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