Recently, as the serious damage caused by DDoS attacks increases, the rapid detection of the attack and the proper response mechanisms are urgent. Signature based DDoS detection systems cannot detect new attacks. Current anomaly based detection systems are also unable to detect all kinds of new attacks, because they are designed to restricted applications on limited environments. However, existing security mechanisms do not provide effective defense against these attacks, or the defense capability of some mechanisms is only limited to specific DDoS attacks. It is necessary to analyze the fundamental features of DDoS attacks because these attacks can easily vary the used port/protocol, or operation method. Also lot of research work has been done in detecting the attacks using machine learning techniques. Still what are the relevant features and which technique will be more suitable one for the attack detection is an open question. In this paper, we use the chi-square and Information gain feature selection mechanisms for selecting the important attributes. With the selected attributes, various machine learning models, like Navies Bayes, C4.5, SVM, KNN, K-means and Fuzzy c-means clustering are developed for efficient detection of DDoS attacks. Then our experimental results show that Fuzzy c-means clustering gives better accuracy in identifying the attacks.
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