Wireless mesh network (WMN) is considered as a key technology in today’s networking era. In this, security is determined as a vital constraint. Several approaches have been proposed to provide secure communication in WMN but communication security possibilities always exist and are very hard to maintain. Black hole and gray hole are the two major attacks at the network layer in WMN. RAODV, IDSAODV, and RIDAODV are some security approaches against these attacks. These approaches can immune the communication at a certain rate. We have proposed a cache-based secure AODV routing protocol, i.e., SDAODV in which instead of using the RREQ messages, security is provided by using the last sequence number of each packet. Using this approach, we have improved the network throughput at a certain rate. The performance of the proposed approach is evaluated by showing the throughput graph.