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Wormhole attack is one of the most severe threats to ad hoc networks. There have been many researches to overcome the wormhole attack. These researches, however, still have some limitations to handle wormhole attacks properly such as burden of computation, complicated steps before making up a session, and no response method. In this paper, we propose an effective wormhole attack defense method that can properly detect wormhole attacks and respond to them. Each node maintains its neighbors' information. According to the information, each node can identify replayed packet that forwarded by two attackers. We analyze the effectiveness of the proposed method and the efficiency of the approach by using traffic and memory space measure.