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故事以迎来“乒乓球战国时代”的东京为舞台，是一部描写高中生们展开激烈的桌球战斗和友情的体育青春剧。剧中的东京掀起了空前的乒乓球热潮，决定高中生优劣的不是学习，也不是打架，而是乒乓球比赛的胜败，乒乓球段位排在下面的高校要绝对服从排在上位的高校，这部剧描写的就是高校之间如同进入“乒乓球战国时代”一样，进行霸权之争的故事。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.3.13一边满含期盼地看着大苞谷，希望他点头。Since ancient times, every dynasty has a class solidified. However, no matter how the class solidifies, 5% of the poor can break through. Because they jumped out of the poor thinking caused by scarcity.Socks are high-frequency and low-cost consumer goods. People often ignore the influence of materials and designs on wearing experience and service life. However, holes, smells, dyes and heels are all real embarrassments in life.Shandong Province