Mobile Adhoc networks are gaining popularity because they are easily deployable & use limited resources. They are susceptible to various attacks. Flooding & Black hole attack are more prevalent in MANET. Flooding attack send large volume of fake requests to the network & legitimate users are deprived off the basic services. The black hole attacker node intercept the route & reveals that it has shortest route to the destination. This node selectively drops the packets. This paper proposes a ACO based technique to detect both flooding & Black Hole attacks. Further this paper investigate the impact of mobility speed on different detection techniques viz ACO based (hybrid), Flooding Intrusion Detection System (FIDS) & Sequence no. based technique for black hole detection (CUSUM). The excess deposition of pheromone over the nodes during flooding of RREQ packets is used to defend against flooding attacks and lower limit of pheromone left over destination (when it does not receives packets)has been used to counter black hole attack. This scheme had been simulated in Network Simulator, NS2.35, and has shown improvement over existing FIDS (flooding attack defense scheme) and CUSUM (black hole attack defense scheme).

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