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$("form"). Bind (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.　　风一来了就给老铁的班组惹事生非，搞得大家叫苦不迭，师徒二人你来我往的交锋起来。大徒弟，二徒弟都劝说老铁退还了老三风算了，老铁却坚持让他留下来，老铁不信还有练不成钢的铁。剧讲述了因谎言爱情和人生全都错综复杂,甜蜜的家庭故事。