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Abstract. This paper describes a set of criteria for evaluating defence mechanisms against flooding denial of service (DoS) attacks. Effectiveness and usefulness of a defence mechanism in mitigating a DoS attack depends on many issues which are presented here in the form of a taxonomy. The primary goal of this taxonomy is to help in getting a comprehensive view on both the strengths and weaknesses of a specific defence mechanism. A good defence mechanism should not disturb legitimate traffic when there is no attack, should mitigate the amount of attack traffic well enough, should increase the quality of service (QoS) available to legitimate traffic during an attack, and should use as little resources in this task as possible. In addition, any defence mechanism should be robust against changes in attack characteristics and intentional misuse.

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