The proliferation of wireless mobile devices has revolutionized the world, leading to the popularity of the mobile ad hoc networking technology [1]. This emergence of the mobile ad hoc network (MANET) has facilitated the drift from personal computing to ubiquitous computing in our society. Today, mobile devices such as smartphones, laptops, notebooks and tablets are fast becoming an integral part of man’s life and a good number of those in the academia and industry now access the Internet on-the-go, through a wide range of mobile devices. In this paper, we provide our design methodology for the development of a multi-agent intrusion detection system for countering distributed denial of service (DDOS) attacks in mobile ad-hoc networks. Keywords: DDOS, Mult-agent intrusion detection, security, MANET, Attacks.