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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.The download looks like this:这次，陈启是先发布了《倚天屠龙记》，大家都确确实实的知道小龙女就是女主角。tvN灵异刑侦剧《你是谁(Who Are You)》。讲述了苏怡贤与泽演饰演的刑警通过与物证中留下的灵魂交流破案的故事。苏怡贤饰演因一起意外沉睡6年，醒来后变得拥有特殊能力，能看到死者灵魂的刑警。泽演饰演只相信亲眼看到的事物，因常惹麻烦而被指派给苏怡贤当手下的热血刑警。接档《恋爱操作团》。Return parent;Output: