Abstract

A website DDoS is executed by flooding one or more of the site's web servers with so many requests that it becomes unavailable for normal use. If an innocent user makes normal page requests during a DDoS attack, the requests may fail completely, or the pages may download so slowly as to make the website unusable. DDoS attacks typically take advantage of several computers which simultaneously launch hundreds of thousands of requests at the target website. the attackers are most likely going to use non-commercial computers as attack platforms, because they are usually easier to break. To solve the problems, several defense mechanisms against DDoS attacks have been proposed in the literature. However it is not easy for a security manager to select solutions suited for his service environments. Under the respect, this is intended to classify DDoS defense systems based on the functional design method. Also various experimental results of DDoS defense systems by using our proposed classification of defense systems and performance metrics.

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