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"State Mode"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.燕大侠现在感觉怎么样？好个恶贼。　　这部剧由《美国众神》作者尼尔·盖曼与《碟形世界》作者特里·普拉切特所著的同名幽默奇幻小说改篇（该小说名称是恶搞恐怖电影《凶兆 The Omen》）。 两位作家斩获了二十余次奇幻文学的头等大奖，写《好兆头》却只是为了让对方大笑出声。原著功力可想而知。俞大猷情急之下抽刀便上，擒贼先擒王，这是唯一的也是最后的机会。果然，她接连清除许多细小的木刺，把那伤口重新清理了一遍。