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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.对于第二季，让我们一起期待吧，感觉2022年又多了一件值得期待的事！第2季动画中，将刻画升入私立风林学园中学部的主人公茂野大吾的活跃身姿。主视觉图中，除成长后的大吾和佐仓睦子等人的身姿外，还描绘了将在第2季中登场的风林中学棒球部的成员。竟然被自己治下了大家族威胁？尽管这徐家的少爷、小姐并不知道自己的身份，可从另一个侧面就可以看得出来，徐家仗着自己的家世财力，可是嚣张的不是一点了。杨一繁因为工作不能接木木放学，木木很失落。原来当天是杨一繁的生日，木木准备了礼物想给妈妈一个惊喜。南宫悟答应把木木带到杨一繁工作的地方，竟然是一间会所。南宫悟碰到了正在被客人拉扯的杨一繁，杨一繁表示自己只是陪酒，但客人暴力动粗。南宫悟见状上前制止，救下了杨一繁。木木和杨一繁的同事们一起为杨一繁庆祝生日，不料在生日会上，木木突然流鼻血昏倒。医生告知木木得了白血病，除了要准备治疗费用，还需要骨髓配型。