A QOS parameter analysis using TCP variants under abnormal behavior of AODV for MANET environment

Abstract

Mobile Ad-hoc networks dynamically form temporary network in infrastructure less manner with decentralized environment, scalable approach and communicate with neighbors through reactive and proactive routing protocol. Due to frequent topology changes, fluctuating link capacity and limited resources there is significant packet loss which may directly degrade QoS parameter. In this article denial of service attack like blackhole and grayhole behavior is considered as security threat and analyzed with reactive routing protocol AODV.Due to reliable nature and congestion control behavior of TCP variants like New Reno which continues under fast recovery until window gets deflated and Vegas which is based on queuing delay based mechanism is considered. QoS parameter can be improved under abnormal behavior using TCP variants is analyze with the help of NS-2 in mobile Adhoc environment.