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他怎么敢放火——放火就暴露他自己了。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.在叙利亚，一名年轻女子在长达五年的时间里与爱情、战争和母性作斗争。贩毒集团首脑“玫瑰”为报复干探龙志强，十五年前侦破其逾亿元交易，对龙狠下毒手灭门，龙幸逃过大难，且深信女儿仍在生，背后实被玫掳走洗脑及训练成美艳杀手“小凤”。小凤后来成为“玫”集团中的顶级杀手，武艺高强，每次均能完成任务，玫更因此借助这群精英将犯罪集团扩大，任务遍及世界各地。龙更意料不及成为自己女儿的目标……不过他知道周姑娘的心思，不敢贸然决定，还想看看你的表现再说。"Mice belong to rodents. It is indeed their natural nature to be good at digging holes and drilling the ground, but how efficient is it to use this skill to avoid fire on the spot?" I still couldn't believe it, so I continued to ask.