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黎水忙点点头，一点也不害怕，有的只是兴奋。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.古北口有云姓世家历代务矿，所产五金，远近著名，云鹏排行第三，人称云三少，娶美妇柳若水，一对璧人无不羡慕。一日尼姑庵传出命案，一寄居潇湘女竟无疾而终，仵作刁五门检验无着，幸佟林观察入微，由其双足之抽出两尺长金针各一支，针头有剧毒，毒攻心房，遂告不治，涉嫌者乃名医麦青山，盖因古北口能使针以取人性命者，惟麦青山而已In this regard, both enterprises, scientific research institutes and the government are expected at different levels. As far as the government is concerned, Li Qiang has repeatedly said in front of all kinds of enterprises, whether it is the central enterprise Shangfei Company or the private enterprise Xiaomi Group, that Shanghai will strive to provide high-quality services around the needs of enterprises and create a first-class environment for enterprise development. Efforts in this regard include government service measures such as the "One Netcom Office" and the promise of "responding to every request and not disturbing anything".皇上隆恩，命下官任岷州知府。