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青鸾公主听了这话，急得原地转了个圈，忽然一把拉住黎水（小雀），将她拽过来，低声对林聪（灵儿）道：不，我装作小雀。李泽点头道：是的，汉王是诚心实意想要与越王结盟。大龄单身男青年郑鲤，生活细致渴望爱情，面对女性时有异于常人的思维方式。有一个暗恋多年的女神，和一个蹭吃蹭喝的发小，更有一个花式催婚的妈，在生活和工作中产生了一系列令人捧腹的笑料。虽然总是遇到一些困难挫折，一次又一次被生活扼住了喉咙，但他仍然没有失去对生活的信心，坚持自我，这样的他会迎来人生的曙光吗？　　在生与死面前，仅剩的六名姐妹最后看了一眼深爱的大地，手挽手，拉响了手榴弹。In the first episode, Wu Xiaoming, a 1977-level college student and dean of Fudan College of Fudan University, and Yu Lizhong, a 1978-level college student and president of NYU Shanghai, were invited to tell the story of taking the college entrance examination that year: How did you feel when you suddenly heard the news of resuming the college entrance examination after years away from class? How to review for the exam under the difficult environment of going to the countryside? How to choose your major and what are the test papers? When they finally step into the university campus, what kind of mental state do they learn? Forty years later, how do they view this bitter and happy past?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.