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The above example shows the deletion of a rule with a source address of 192.168. 1.146 and an action of DROP in the INPUT chain in the filter table.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.大都会繁华璀璨，可是一班寄居在社会低层的弱势群体，不单止享受不到繁荣带来的富足和温饱，反而遭到压榨和剥削，幸而，在浊世之中，仍有人挺身而出，为这群可怜人仗义执言，他就是盲侠大律师。这么晚把娃们都叫来，可不是哭死哭活的。为什么他的生活会弄成这样？最简单、最平常的爹娘生养，在他这里成了奢侈，成了一团乱麻。大家好，谢谢大家喜欢《白发魔女传》，也谢谢大家一直对《白发魔女传》的支持。