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User name cannot be emptyForm ValidationWhen 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.张无忌顿时面红耳赤，在这武当山上都是男弟子，还有不少都还是道士，清心寡欲到了极点，他不想保持童子身也不行啊。Symantec Protection Engine 7. X for Windows网剧《小妖在人间》由北京小龙腾飞影视文化发展有限公司出品，小龙腾飞影视和盛世鸿影(北京)文化传播有限公司联合制作，霍城麦基影业传媒有限公司发行。酷酷的赏金猎人·沙托和谜一般的最强男子·李雅哈。