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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.之所以现在要替假玉米诊治，那是因为你们觉得他身上有阴谋，想要揭开这个阴谋，你心里就希望替他诊治，觉得是为他好。调酒师（山本晃司）听他们的故事并为他们制作鸡尾酒。你倒不如好好干点正事，挣些家当财物，只怕往后还能遂心也不一定。二战结束后，数百位纳粹分子逃至西班牙躲藏。到了1960年代，某位大屠杀幸存者加入特务行列，要向这些纳粹讨回公道。这件事彻底惹恼了何永强，也让全会稽的人都看到了他的手段，黑道的地痞流氓，白道的官府两路齐发，既有不讲理的捣乱砸店，又有执法的官府一天三检，最后轻松找到了理由封了这家布店。With a monthly salary of 3,000, is customer service too busy to think about whether you like to play or not?