This document discusses detecting sequence number collector problems in black hole attacks in AODV-based mobile ad hoc networks. It begins with background on mobile ad hoc networks (MANETs) and characteristics such as dynamically changing topologies. It then discusses the AODV routing protocol and describes black hole attacks, where a malicious node advertises itself as having the shortest path. The problem is that a malicious node can act as a sequence number collector to obtain numbers from many nodes. The proposed solution classifies nodes into categories based on behavior and isolates malicious nodes from routing and forwarding. Associations between nodes are then used for route selection to increase security while encouraging cooperation.