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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.在上世纪八十年代的南部军事行动中，侦察班长胡小军（马跃 饰）身负重伤不省人事，如果不是护士范春晓（徐筠 饰）心思缜密，他险些被放弃治疗，胡小军醒转过来，可还是失去了右臂。胡小军自感成为废人，脾气日益暴躁，但范春晓始终任劳任怨的给予他照顾，胡小军爱上了这位善良的姑娘，可在他进入军校进修之前向范春晓表白之际，收到的却是后者的婉拒。胡小军为了不使在战场上搭救自己的两位战友白白牺牲，矢志献身一线岗位，拒绝了回原籍担任高级干部的安排，用一只左臂完成了军校的学习任务，被分配到武警部队担任连指导员，再度和当年的战友合作，开始了自己在和平年代的再度拼搏……Mangle table: the function of dismantling messages, making modifications and re-encapsulating; Iptable_mangleTaekwondo杨长帆看着老婆，明明一代娇俏小美人儿，穿的却是农家姑娘的衣裳，完全没有地主婆该有的姿态，浑身上下连个首饰都没有，受苦了啊，受苦了。(12.06 update)娘，坐这来。