Design and Development of Proactive Models for Mitigating Denial-of-Service and Distributed Denial-of-Service Attacks

Denial-of-Service (DoS) attacks, orchestrated by a single host or multiple hosts in a coordinated manner, have become an increasingly frequent disturbance in today's Internet. Generally, attackers launch Distributed Denial-of-Service (DDoS) attacks by directing a massive number of attack sources to send useless traffic to the victim. The victim's services are disrupted when its host or network resources are occupied by the attack traffic. The threat of DDoS attacks has become even more severe as attackers can compromise a huge number of computers using vulnerabilities in popular operating systems. This paper deals with proactive models for mitigating DoS and DDoS attacks.