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Delicate mind:我以为你要……我要也不会跟您老人家要。只因在下曾经有个妹妹叫拐子拐去了，今日见了香儿姑娘，觉得特别投缘，就关心过了些。其次，去的人当慷慨陈词，以国之兴亡激励他们，以戍边将士疾苦感动他们，以前次大胜擒获公主、南雀国赔偿损失鼓舞他们，还怕没大夫肯来？既肯自愿前来。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.2017-02-01 10:35:34