Denial of Service and Distributed Denial of Service Attack: Detection and Countermeasures

Denial of Service (DoS) and Distributed Denial of Service (DDoS) attacks are specific attacks that attempt to prevent legitimate users from accessing networks, servers, services or other resources. Windows end-users and Internet routing technology have both become more frequent targets of intruder activity. The impacts of DoS attacks are causing greater collateral damage, and widespread automated propagation itself has become a vehicle for causing denial of service. While DoS attack technology continues to evolve, the circumstances enabling attacks have not significantly changed in recent years. This paper presents various techniques for detection and preventing against various DoS and DDoS attacks. Important features of each attack and defense system countermeasure strategy of each proposed scheme are outlined.