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Packet injection attacks are a primary threat to software-defined enterprise networks, for which continuous connectivity and real-time network functioning are two essential requirements. They are a form of denial-of-service attacks, and their main effect is network performance degradation up to total breakdown. In this paper, we show how such an attack can effectively be detected and mitigated at the entrance gateway switch of the software-defined enterprise network without sacrificing the basic functionality and performance of the networks control mechanisms. We describe an effective protection of the network's core controller as well as a significant reduction of rule-space overhead compared to a state-of-the-art technique.

In recent years, the nuclear power plant has received huge attention as it generates vast amounts of power at a lower cost. However, its creation of radioactive wastes is a major environmental concern. Therefore, the nuclear power plant requires a reliable and uninterrupted monitoring system as an essential part of it. Monitoring a nuclear power plant using wireless sensor networks is a convenient and popular practice now. This paper proposes a hybrid approach for monitoring wireless sensor networks in the context of a nuclear power plant in Bangladesh. Our hybrid approach enhances the lifespan of wireless sensor networks reducing power consumption and offering better connectivity of sensors. To do so, it uses both the topology maintenance and topology construction algorithms. We found that the HGETRecRot topology maintenance algorithm enhances the network lifetime compared to other algorithms. This algorithm increases the communication and sensing coverage area but decreases the network performance. We also propose a prediction model, based on linear regression algorithm, that predicts the best combination of topology maintenance and topology construction algorithms.

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