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When a client accesses a server's web service, The client sends a message to the network card, The tcp/ip stack is part of the kernel, Therefore, the client information is transferred to the web service in user space through the kernel's TCP protocol, At this time, the destination destination of the client message is on the socket (IP: Port) that the web service is listening for. When a web service needs to respond to a client request, The destination destination of the response message sent by the web service is the client, At this time, The IP and port that the web service listens on becomes the origin instead, As we said, Netfilter is the real firewall, It is part of the kernel, Therefore, if we want the firewall to achieve the goal of "fire prevention", You need to set up checkpoints in the kernel. All incoming and outgoing messages have to pass through these checkpoints. After checking, those that meet the release conditions can be released, while those that meet the blocking conditions need to be blocked. As a result, input checkpoints and output checkpoints appear. These checkpoints are not called "checkpoints" but "chains" in iptables.Coconut garden also tried, coconut cake is still called coconut milk jelly, fragrant glutinous smooth, good! Coconut rice and accreted duck taste good,该系列讲述了痞子泽基(埃利亚斯·穆巴里克饰)出狱后混入学校伪装成代课老师的故事。据悉，桑德拉将扮演一个机智的新教练，她将与埃利亚斯·穆巴里克扮演的伪代课老师和问题学生们斗智斗勇。我们闹着玩的，让弟弟学干活。原口元子（武井咲 饰）背负着双亲留下的债务，白天在银行做派遣职员，晚上在银座的俱乐部陪酒。她利工作之便搜集证据，凭借一本写满银行与客户串通用假名户口逃税的证据的黑色皮革手册，勒索1亿8000万日元，变身成为银座俱乐部“卡露内”的妈妈桑。没有任何靠山的她仅凭自己的野心，作为年轻的妈妈桑在黑夜世界里打拼。如“魑魅魍魉”一样的坏人们围绕在她的身边。在各种各样的欲望交织之中，元子孤军奋战。"When this thing first appeared (that kind of dog-like 'living biological weapon'), I thought it was the gunfire that frightened the wild animals in the nearby woods. However, when I thought about it later, I was not right. Although I don't have a high diploma, The highest education received is high school. But before going to the front, In order to better adapt us to the fighting and life in Vietnam, Every backbone and cadre from the vice squad leader to the battalion level has gone through half a month to a month of 'surprise study'. The main content of the study is to catch up on the knowledge related to Vietnam. Among them, it is related to the local tropical rain forest, And what biological part of it takes up at least half of the class hours, What leeches, leeches, all kinds of poisonous snakes and insects, All said, but did not mention that there are social carnivores here, and they will also take the initiative to attack human beings so fiercely. I think if there are, it is impossible not to write in the textbook of "surprise learning", then it is not a natural creature. I was wondering at that time, when they appeared just at the time when the Vietnamese army's attack was frustrated, would it be related to them?