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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.板栗正色对他道：孙大哥，你这就请回吧。Taraji P.Henson主演动作片#骄傲的玛丽#发布预告，演了Cookie、卡姐等厉害角色后，这次Henson直接变女杀手，预告大半时间在光鲜换装、物色武器。当然杀手片的任务总会出错，玛丽碰上了一个小男孩，激发出强悍下的母爱。《伦敦陷落》导演Babak Najafi执导，明年1月12日北美上映。
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