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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.残酷的真相像刀子一样一次次割裂着李家瑜脆弱的心，最终将家瑜逼上了复仇之路，家瑜以“智慧和正义”为武器，向前夫和闺蜜展开了一场激烈的抗争……几位性格迥异又都青春洋溢的刚刚入学的高一新生，在一系列蠢萌事件中度过了真实又搞笑的的高一生活，并在其中认识到了自身努力的必要性。5 成人考试然而，在镁光灯下风光无限、叱咤行业十年的莫向晚却正困于不上即下的职场牢笼。她亲手培育的艺人、亲手提拔她的老板、协作多年的同事、在假意真情之间奉来迎往的合作方、甚至她倾心相爱的男人和真心相待的朋友，都是她在欲望都市里最熟悉的陌生人。小草在一张矮椅上铺了张棉垫子，扶姑娘坐了上去，一边回答二舅奶奶的殷切询问。以后，天启就是我偶像，他无论说什么，我一定都相信。