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Top原来如此。So let's explain the rules of iptables in a common way. There was an analogy before, Each "chain" is a "checkpoint", Every message passing through this "level" must match the rules on this level. If there is a match, The message is processed correspondingly, For example, you and I are like two "messages" at the moment. Both of you and I are going to enter the customs at this moment. But the duke has a life, Only the imposing person can enter the customs, Those who do not meet this requirement are not allowed to enter the customs. So the soldiers guarding the customs followed the "rules" formulated by the duke. I began to look at you and me. In the end, you entered the customs smoothly, and I was rejected. Because you met the standard of "dignity", you were "released", while I did not meet the standard, so I was not released. In fact, "dignity" is a kind of "matching condition", "release" is a kind of "action", and "matching condition" and "action" form the rules.To verify SYN? Cookies, first subtract the acknowledge number in the received ACK message segment by 1 to regenerate the SYN? Cookies. The calculation of these truncated hash bit authentication values is based on the IP address, port number, sequence number minus 1, and the value in the password pool corresponding to the index number in the cookie. If the calculated values are the same as those in the cookie, the TCB initializes and starts establishing the connection. The encoded MSS upper bound is used to set an MSS value that does not exceed a reasonable size of the original value. MSS is usually implemented by 3 bits, which correspond to 8 MSS values calculated by MTU (Maximum Transmission Unit) and Ethernet header of general link.李跛子见到苏角，回应道：没事，我出来一趟，一会就回去。故事发生在1985年的上海，面临去北京大学报道，孙雨欣（剧雪 饰）的母亲突然因车祸撒手人寰，留下了三个未成年的弟妹，而这三个孩子都是母亲当狱警时收养的犯人的后代。雨欣放弃了上大学的念头，靠打工抚养三个没有血缘关系的弟妹，中间她还有一段短暂的婚姻。十年后，弟妹陆续长大成人，而雨欣也在考虑要不要嫁给一直帮助自己始终未婚的中学同学大暑（董勇 饰）。当年和她一同考取北京大学的田风（王同辉 饰））如今海外归来，交谈中得知雨欣多年来的不易，他帮助雨欣将“亲情树”系列服饰推向市场。雨欣原本想在新闻发布会上与大暑举行婚礼，不料节外生枝，发生了谁都想不到的一幕......