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　　关键时刻，一直在学校附近偷窥学生们举止的神秘男子雫井彗（神木隆之介 饰）出现在小燕面前，他鼓动这个懦弱的女孩拿起语言的武器，用前所未有的说服力凌驾这所等级森严且拜金的学校顶端……New variable name: JAVA_HOMEWhat pattern do you think Hiroshi and Naruto are showing马蹄震拂晓，风卷惊飞鸟，闪亮刀出鞘，酒酒醉带笑，英雄不留名，千里雨中行，搏杀崆峒顶，血染见豪情。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.