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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.…,只听高易续道：徐家虽然一直为归附，却表现出了足够的诚意，一直和我们保持着良好关系。由樱井翔主演的《只是先出生的我》，讲述了杰出的商社精英鸣海凉介被派往一家经营不善的私立高中担任校长，重建学校的奋斗故事。　　故事要追溯到数年前，那名中年男子经历了失业、离婚，与一条狗展开了没有目的地的旅途，然而，这场旅途很快就走向了终点……灰豆儿是几千年以前孙悟空捣毁妖精洞的时候藏在石头缝里的一个小精灵。几千年以后，他从石头缝里爬出来了。看到自己的先辈们干了那么多的坏事，灰豆儿决心改邪归正、脱胎换骨，做个好孩子。出洞以后，小灰豆儿和猪八戒的尾巴胖胖成了好朋友，俩人齐心协力，不怕困难和挫折，在天宫和人间做了很多的好事，但却反被误解为“坏精灵”。灰豆儿想不通，胖胖鼓励他：只要坚持做好事，总有一天，大家会理解的。于是，一连串的故事发生了……/sniff (inhale)/beg (beg)