Abstract—The limitation of the Ad Hoc On-Demand Distance Vector (AODV) protocol is that the Route Request Packet (RREQ) is not designed for security purposes. Therefore, a malicious node can attack the network by continuously broadcasting RREQ packets at high frequency, which is called the RREQ packet flooding attack. The result is a broadcast storm that greatly increases media waste and resource waste. This article proposes a Flooding Attack Detection Mechanism Using the Median (FDMM) value to detect and prevent flooding attacks. Each node that installs the FDMM solution will collect the route discovery behavior history (V) of each node to construct the route discovery frequency vector; By calculating the median value (m) of V, the node compares the m value with a Fixed Threshold (FT) node that can identify a node that has performed malicious or normal behavior. The paper also proposes the Flooding Attacks Prevention and Detection Routing Protocol (FDMM AODV) protocol by improving the route discovery mechanism of the AODV protocol using FDMM. Simulation results show that our solution can detect over 98% of malicious nodes; Packet delivery ratio, routing load, and endto- end delay are effectively improved.