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首页> 外文期刊>American journal of applied sciences >Impact of Malicious Nodes under Different Route Refresh Intervals in Ad Hoc Network | Science Publications
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Impact of Malicious Nodes under Different Route Refresh Intervals in Ad Hoc Network | Science Publications

机译：Ad Hoc网络中不同路由刷新间隔对恶意节点的影响科学出版物

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> Problem statement: Ad hoc networks are formed dynamically by group of mobile devices co operating with each other. Intermediate nodes between source and destination act as routers so that source node can communicate with the destination node even if it is out radio range and thus eliminating the necessity of infrastructure. Co operation of nodes is a very important feature for the successful deployment of Ad hoc networks. The intermediate nodes should not only be involved in the route discovery process but also should be involved in the re transmission of packets as an intermediate between source and destination. Approach: Since nodes have to be co operative for successful deployment of Ad hoc networks, the security mechanisms cannot afforded to be stringent which enables malicious nodes to successfully attack the network. The capability of optimized link state routing protocol has been studied extensively for different types of ad hoc networks and has been proved to behave somewhere in between pro active and reactive routing protocols. Results: In this study we investigate the impact of malicious nodes on the Optimized Link State Routing (OLSR) protocol under different hello intervals which affects the route discovery process and subsequently investigate the degradation of Quality Of Service (QOS). Conclusion: It is observed that the throughput deteriorates when the network is attacked by malicious nodes which selectively retransmit data to some of the destinations. The performance degradation increases as the hello interval time is set beyond 4 sec. Higher hello interval decreases the control packet overheads. It is observed that even with higher hello intervals the network performance is much better than an attack by small group of malicious nodes.
机译： > 问题陈述： Ad hoc网络是由相互协作的一组移动设备动态形成的。源和目标之间的中间节点充当路由器，因此即使源节点不在无线电范围内，源节点也可以与目标节点通信，从而消除了基础架构的必要性。节点的协作是Ad hoc网络成功部署的非常重要的功能。中间节点不仅应参与路由发现过程，而且还应参与数据包的重新传输，作为源和目标之间的中间节点。 方法：由于节点必须成功合作才能成功部署Ad hoc网络，因此无法提供严格的安全机制以使恶意节点能够成功攻击网络。已针对不同类型的ad hoc网络广泛研究了优化的链路状态路由协议的功能，并已证明其性能介于主动和被动路由协议之间。 结果：在本研究中，我们调查了不同问候间隔下恶意节点对优化链路状态路由（OLSR）协议的影响，这会影响路由发现过程，并随后调查服务质量（QOS）的下降）。 结论：可以看出，当网络受到恶意节点的攻击时，吞吐量会下降，这些恶意节点有选择地将数据重新传输到某些目的地。当hello间隔时间设置为超过4秒时，性能下降会增加。较高的问候间隔减少了控制分组的开销。已观察到，即使具有较高的问候间隔，网络性能也比少数恶意节点的攻击要好得多。

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