Distributed Denial-of-Service (DDoS) attacks are a variant of Denial-of-Service (DoS) attacks where an attacker or a group of attackers employ multiple machines to carry out a DoS attack simultaneously, therefore increasing its effectiveness and strength. DDoS attacks in the networks needs to be prevented or handled if it occurs, as early as possible and before reaching the victim. Dealing with DDoS attacks is hard due to their properties such as dynamic attack rates, various kinds of targets, big scale of botnet, etc. DDoS attacks are hard to detect and block since the attack traffic is easily confused with legitimate traffic and difficult to trace. DDoS attack becomes more difficult to handle if it occurs in wireless network because of the properties of ad-hoc network such as dynamic topologies, low battery life, multicast routing, frequency of updates or network overhead, scalability, mobile agent based routing, and power aware routing, etc., Therefore, it is better to prevent the distributed denial of service attack rather than allowing it to occur and then taking the necessary steps to handle it. This paper discusses various the attack mechanisms and problems due to DDoS attack, also how MANET can be affected by these attacks. In addition to this, a novel approach is proposed to defense against DDoS attacks in Mobile Ad-hoc Networks. © Research India Publications.