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太太，这只獐子是我射到的哩。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.蒯彻转过身来，沉声说道。Half-connection survival time: refers to the longest survival time of entries in the half-connection queue, that is, the longest time from receiving SYN packet to confirming that this message is invalid. This time value is the sum of the longest waiting time of all retransmission request packets. Sometimes we also call the half connection survival time Timeout time and SYN_RECV survival time.珊瑚听后眼睛亮亮的，对大苞谷道：苞谷哥哥，你就是聪明。故事聚焦一个聋哑家庭中唯一有听觉的高中女孩鲁比,她每天都要帮助父母和哥哥操持渔业生意,在加入高中合唱团后,鲁比对歌唱的热爱打动了合唱团长,团长决定让鲁比在梦想和家族之间做一个选择。