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Some recent systems basically default to 1024 bytes of backlog size, but many servers on the network configure it to 128 bytes or less. Usually, the time threshold for retransmitting SYN-ACK is 5 seconds, which is twice the normal successful reception time. The default timeout time is 3 seconds, and the time from the first SYN-ACK to its TCB being recovered is 189 seconds.香荽也道：花生，你不是和玉米天天吵着要跟我去铺子么，这也算经济学问了。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.雪儿便是他要找的人，可雪儿原本是现代人，每天生活在繁华的都市，下班后会上爱奇艺网站观看网剧，像其他20多岁的女白领一样，想找一个30岁的如意郎君、热爱生活，热爱运动，热爱她40岁的妈妈、50岁的爸爸。她不想嫁给武天祥。武天祥有时甜宠她，有时像霸道总裁，惊险刺激幽默搞笑，还对她虐心虐肺。两个人该怎么相处呢？雪儿又该怎么回到现代？武天祥狠了心非要娶到雪儿……不过还好，老鼠吃大象，倭人虽不买杨长帆的账，却对王翠翘很是敬畏。Sets the default policy (default action) for the specified chain of the specified table, not adding rules.　　凭借黄埔的背景以及过硬的素质，梁一路擢升，成为了我党安插在国民党内部一颗重要的棋子。与此同时，军统方面对南京的地下党展开拉网式搜捕，梁的真实身份也受到了怀疑……