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A firewall unit of H-HIPS (Hardware- and Host-Based Intrusion Prevention System) is needed for reduction of unauthorized access detecting circuits. Because H-HIPS has been achieved by using FPGA, generated circuits by logic synthesis software operate with low-speed clock signals. For operating with high-speed clock signals, pipelined circuits are required. They cause consumption of LUTs (LookUp Table) and registers and increase of power consumption. In this paper, we propose wave-pipelined operation of the firewall unit without reconstruction of circuits. Wave-pipelined circuits have never been achieved without them. We show the unit by wave-pipelined operation can use clock signals of the frequency twice by the gate-level simulation.