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[Irrigation Nutrient Solution]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.只是现在，新版的《铁血丹心》实在是太火了，网络上、现实中到处都是关于《铁血丹心》的声音，这难免让人产生一种好奇、一种期待，想要目睹一下《铁血丹心》的真容。不管怎么说，他曾经是汉国兵马大元帅的事实都改变不了，在很多人看来这本身就是一种背主自立的感觉。Public Handler getHandler () {在少林、武当、峨眉等各大名派尚未崛起之前，有“天下第一魔”之称的天诛教教主令狐笑正欲称霸武林，遭到有“天下第一人”之称的司马傲阻止，于是两人约战于泰威山顶，结果令狐笑被司马傲的“正直宽大”感化，双双退隐江湖......