As denial of service (DoS) attacks are becoming more common in the Internet, there is greater need for solutions to overcome these attacks. Defending against DoS/ DDoS attacks can generally be divided into 3 phases: prevention, detection and response. Detection is one of the key steps in defending against DoS/ DDoS attacks. However, with the high variation in the DoS/DDoS attack types, the detection of such attacks becomes problematic. A good detection technique should have short detection time

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... and low false positive rate. This paper presents an introduction to intrusion detection systems (IDS) and survey of different DoS/DDoS detection techniques. The key observation of this survey paper is that a CUSUM-based detection technique has many advantages over other statistical instruments in that it is non-parametric; consequently, it does not require training and is more robust to variations in the attack profile.