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The existing protocols for the Internet connectivity of mobile ad hoc networks suffer from high overhead since they often rely on flooding in mobility management and/or route discovery. In our approach, mobility management of mobile nodes is achieved in the construction process of tree topology and also contributes to building topology information for a routing protocol, resolving the inherent problem of the excessive control overhead in link state routing protocols. The activities of the routing protocol help updating the topology information. In this way, mobility management and routing protocol collaborate to increase convergence speed of topology and reduce control overhead. In addition, a message aggregation technique is used to reduce the congestion of mobile nodes near the Internet Gateway that process much more control messages. Simulation results show that the proposed method far outperforms …