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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.刘黑子两口子顿时惊住，仿佛不敢相信自己的耳朵。(1) Lazy style千古第一相绝对是所言不虚，即便是现在年纪大了，但是老而弥坚，经验更为丰富。泥鳅舅母被她那狰狞的面色吓得倒退一步，没想到一向和气的刘家小姑子这么厉害。