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妻子因病过世的小说家小比贺太郎，40岁，是个宠爱女儿的单亲爸爸。因为担心太过天然呆的女儿小樱要去读男女混校的大学，所以决定和女儿一起去读同一所大学同一个系。为了插手监督女儿的大学生活，他也跟著参加了 研究会、社团、聚餐、联谊、派对、文化祭，其实，比任何人都超享受自己的大学生活。In "Qi Pa Shuo", Zhang Quanling once mentioned that,"I... my grandmother is seriously ill at home... I... my only reliance on her... sir"当刘邦带回来淮水岸边的最新消息时，他已经预见到事情不会这么简单。二更求粉。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.