Research Of Flooding Attack And Prevention In Ad Hoc Network

Mobile Ad hoc Networks are the collection of wireless computer, communicating among themselves over possible multi-hop paths, without the help of any infrastructure, such as base stations or access points. Nodes in mobile Ad hoc network collaboratively contribute to routing functionality by forwarding packets for each other to allow nodes to communicate beyond direct wireless transmission range, hence practically all nodes may act as both hosts and routers. Mobile Ad hoc networks require no centralized administration or fixed network infrastructure and can be quickly and inexpensively setup as needed. They can thus be used in scenarios where no infrastructure exists, such as military applications, emergent operations, personal electronic device networking, and civilian applications like an ad-hoc meeting or an ad-hoc classroom.With more and more application, security for mobile Ad hoc networks becomes increasingly important. Such as routing protocol, conserving energy, network security. To secure mobile Ad hoc networks, my dissertation will explore the security technologies in mobile Ad hoc networks, including security architecture, DoS attack model.Firstly, A dynamic Ad hoc network security model to solve the limitations of classic dynamic network security model is proposed. This security model makes use of all kinds of security components to construct a four-layer defense architecture whose Availability can protect the network. In order to one kind of new DoS attack model to lay the rationale.Secondly, Mobile Ad hoc networks will often be deployed in environments where the nodes of the networks are unattended and have little or no physical protection against tampering. The nodes of mobile Ad hoc networks are thus susceptible to compromise .The networks are particularly vulnerable to denial of service(DoS)attacks launched through compromised nodes or intruders. In this paper, we present a new DoS attack and its defense in Ad hoc networks. The new DoS attack, called Ad hoc Flooding Attack(AHFA),can result in denial of service when used against on-demand routing protocols for mobile Ad hoc networks, such as AODV,DSR. The intruder broadcasts mass Route Request packets to exhaust the communication bandwidth and node resource so that the valid communication can not be kept. After analyzed Ad hoc Flooding Attack we develop Flooding Attack Prevention(FAP),a generic defense against the Ad hoc Flooding Attack in mobile Ad hoc networks. When the intruder broadcasts exceeding packets of Route Request, the immediate neighbors of the intruder record the rate of Route Request. Once the threshold is exceeded, nodes deny any future request packets from the intruder.Finally, In order to study Ad hoc Flooding to attack the influence which produces to the network performance, simultaneously confirms the defensive measure the actual function effect, The results of our implementation show FAP can prevent the Ad hoc Flooding attack efficiently.