Modeling and simulation of DDoS attack using Omnet++

Distributed Denial of Service (DDoS) attack continues to evolve over the past two decades. Its easy accomplishment, hard tracing and disastrous effects make it a popular choice among the attacker's community. The goal of DDoS attack is to overwhelm the target's resources to such an extent that it becomes incapable to serve the legitimate client. Till date, researchers have proposed many solutions to detect and mitigate DDoS attack, but a very little attention is given to impact analysis of attack. The purpose of this paper is to study the impact of DDoS attack with respect to two parameters: attack intensity and buffer size. In this paper, we model and analyze different DDoS attack scenario using different attack rate and different buffer size of network components. The results in this paper indicate that performance of WebServer degrades with increase in attack intensity and low buffer size.