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CW续订《圣女简恩》第四季。曼彻斯特传奇 DJ 在伊维萨岛神秘失踪二十年后，他的遗体终于被人发现，他的妹妹随后回到这座美丽的西班牙岛屿来查清真相。她的调查将其带入了一个惊心动魄的世界，这里有各种各样的夜店，还有谎言和欺骗，这里人人都在行走江湖，她也被迫要正视自己性格中的黑暗面。In addition to solving the port problem of A, the serial number problem also needs to be paid attention to. The serial number corresponds to the sliding window. The fake TCP packet needs to be filled with the serial number. If the value of the serial number is not in the sliding window of B when it is sent to B before A, B will actively discard it. So we need to find the serial number that can fall into the sliding window between AB at that time. This can be solved violently, because the length of a sequence is 32 bits, and the value range is 0-4294967296. If the window size is like 65535 under Windows I caught in the above figure, I only need to divide, and I know that at most I only need to send 65537 (4294967296/65535=65537) packets to have a sequence number fall into the sliding window. The desired value can be calculated quickly by exhaustion on multiple control hosts.Attack-Life风险太大，有时候即便是小心行事依旧是危险重重。This is what we often call the professional model.