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To correct an iframe problem before giving an example, someone will write it directly on a third-party page. As follows:《远古入侵：新世界》是加拿大与英国合拍的《远古入侵》（Primeval）衍生剧（Primeval: New World），二者除了基础设定相同之外，故事情节完全不同。小葱摇头道：我照顾娘。看看外面天色不早了，秦枫便向永平帝告辞。无视混乱的二阶堂持续暴走的由奈。二阶堂为了提出分手的事情，尝试了好几次，但一直被卷入由奈的步调中，夜越来越深。究竟二阶堂能平安地和由奈分手吗…！？《暗中第一季》由Corinne Kingsbury执笔，讲述一个充满缺点﹑无礼的盲女是她那贩毒朋友被杀时的唯一「目击者」，而警方不理会她的证供后，她决定与导盲犬Pretzel去试图找出真凶。期间女主仍然得应付自己的感情生活，以及那份由保护欲过盛父母提供的导盲犬学校工作。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.