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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.FBI深度卧底组（Deep Cover Operations，简称D.C.O.）特工Martin Odum（Sean Bean）拥有超出常人想象的适应能力——无论执行任何任务，他都能完美地将自己「转化」成不同的人，从而成功混入敌人内部。然而一个神秘的陌生人声称Odum并 不是真正的Odum，令Odum开始质疑自己的真实身份，整个事件变得扑朔迷离。于是，这同时并举的救援游戏就玩成功了。Matching conditions are divided into basic matching conditions and extended matching conditions《幸福保卫战》海报(3张)一天之内一群人围绕古玩发生的一连串啼笑皆非的故事。Then I called the health workers to rescue Zhou Xiaolin, While looking at that thing, After careful identification, Only then did I find that the mouth of this thing is not the kind that ordinary animals open and close up and down. But like a 4-petal 'flower', it has 4 lips, which are arranged centripetally in a way of 2 above and 2 below respectively. When it opens, it also looks like a blooming flower. Its structure is a bit like 'X' in English letters. Moreover, the 4 lips are all densely packed with small fangs, which make people's scalp pins and needles. "Zhao Mingkai said.