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Cloud computing has transformed the IT industry by providing convenient way of accessing resources, services and applications over the Internet. Cloud computing provides infrastructure, platform, software, and other hybrid models as pay-as-you go based services. Customers pay based on usage of particular utility. There are vulnerabilities in the cloud infrastructure which have been easily exploited by the attackers. The well-known Distributed Denial of Service (DDoS) attack is the most eminent attack in this area of computing. DDoS attacks compromise the services of the cloud servers by overwhelming it with huge volume of normal or incomplete traffic making difficult to respond further to the legitimate clients. In cloud computing, virtual machines are created which run through instances. OpenStack is one such cloud platform, which is Open Source and is mostly deployed as Infrastructure as a service …