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All printed boards must be marked with the printed board number, the company logo, the design date and the manufacturer's production date (marked by year and week).云浩轻轻点点头：是的，还有人来。For the new retail, Osaka Weaving House "all in" has also maintained its consistent caution. This brand, which is good at offline, said when looking online, "We cannot forget offline thinking and ways."赵耘急忙道：皇上莫要难过。The front of the package is marked with a large "GL" logo, the abbreviation of GEAR LAB.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.爱上了瘾 -- 群星