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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.一条小街，三位七旬老人，他们讲的是传统；三个刚走出校门的大学生空降到对面，他们讲的是挑战和突破。“对台戏”的戏台就坚实地砸在这条小街上。情战、商战、谍战、宫战的炮竹捻儿就此点燃……且看一群老、一群少就此开撕，演绎了这个美食与传承的江湖。与家人挥泪惜别后，他第一时间奔赴杭州，首先要明确态度，一切事宜决策、一切人事调配，唯赵文华马首是瞻。戚继光瞬间又回想起了那最古老的恐惧，那是猴子第一次……骡车后面，沈悯芮平躺着，看着蒙蒙亮的天空，她的心比天空还要蒙。自幼，李火星就喜欢看港片。一日，年幼的他偶然看到了李铁牛带上一帮人气势汹汹地离开家里，那画面一瞬间与电影中重合，李火星从此猜测老爸是本地大佬，虽然他的父亲只是去杀猪而已。