This document discusses a technique for detecting and removing multiple black hole attacks in mobile ad hoc networks (MANETs) using sequence number variation in the Ad hoc On-Demand Distance Vector (AODV) routing protocol. The technique modifies the AODV protocol to include a protected field in route request and route reply packets that is used to vary the sequence number, helping identify black hole and gray hole attacks. Simulations using the NS-2 network simulator show that the proposed technique improves performance metrics like packet delivery ratio, throughput, and latency compared to a previous method, enhancing network performance in the presence of attackers.