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the new p0f: 2.0.2 (and 2.0.3-beta) http://lcamtuf.coredump.cx/p0f.shtml P0f v2 is a versatile passive OS fingerprinting tool. P0f can identify the system on: - machines that connect to your box (SYN mode), - machines you connect to (SYN+ACK mode), - machine you cannot connect to (RST+ mode), - machines that talk thru or near your box. そゆもの。