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You can use the flight simulator function in Google Earth to fly around the earth. It allows you to use a mouse or other controller to control the simulated plane.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.There are also such ~网络版是搜狐云剪辑用户将《谎言游戏》中的关键剧情片段截取出来的精华集合，每集时长大概在15分钟左右，大家再也不用担心没有时间看喜欢的剧啦！He has another characteristic, that is, his loud voice. Every time class was over, he was shouting, even the teacher's office could hear him. In the future, when the school radio is bad, please ask Lin Nian to talk about it. The whole world can hear it!