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MANET is a collection of self organized mobile nodes with dynamic topologies and no fixed infrastructure. DSR is single path routing protocol applied for MANET and gives better performance when routes are not long enough. Its performance depends on different parameters value, like number of nodes and mobile connections. Thus routing efficiency is determined based on two aspects: firstly the time needed to react on a link break and secondly the ability to optimize to a shorter route when one is available. Developing better routing protocol became challenging task due to dynamic topology. Multipath routing is effective in mobile ad-hoc networks since link breakage is less likely to occur. A multipath extension to DSR namely Quality Aware Multipath DSR is proposed. Main interest is to divert the traffic through several node disjoint routes. Here source node maintains up to five paths corresponding to same destination as a result of route discovery procedure. The proposed work is implemented in NS2 and simulation results show that the proposed protocol achieves better packet delivery ratio, throughput and decrease average delay.

Mobile Ad hoc Network (MANET) is a collection of mobile nodes and is autonomous having communication through the insecure wireless links. The nodes in the network dynamically add and join the network. Due to this kind of nature nodes are vulnerable to various kinds of attacks. There are many threats in wireless Mobile Ad hoc Networks. MANETs suffers from intrusion in which a malicious node may or may not participate in route discovery mechanism with an intension to degrade the overall network performance. Intrusion has serious impact on routing and delivery ratio of packets. Many researchers have conducted different techniques to propose different types of detection and prevention schemes. Here various attacks types and a survey of the existing solutions is presented. KeywordsAd hoc Network, MANET, Security, Black hole attack, Gray hole attack, Worm hole attack.