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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.顾涧于床前接掌帅印，同时，还有中军帐下三万人马。传说中，太阳系的每一颗星星都有一只守护星龙，它们都生活在星龙圣域里。但太阳系的黑洞无处不在，五百年复活一次的妖兽王，它的出现就像巨大的黑洞一样，笼罩了整个星龙圣域，吞噬阳光，吸取所有星龙的星象力量，一心想要统治整个太阳系，它就是——罗刹•暗无。年轻帅气的小生Tippadai 到苏梅岛旅游，在岛上遇到了回家的Prida。开始时两人如冤家般话不投机半句多。之后接触多了，二人心理渐渐对对方有了化学反应。离开苏梅岛之前，Tippadai留了名片给Prida 。黎章把他们的转变看在眼里，十分满意，又交代了一番，才让他们散去。However, when the industry was fighting "fast", it also encountered embarrassing situations. For example, one year when the Oscar awarded the best picture award, the guests mispronounced it, and the colleagues sent it out in the first place....無実の男 草なぎ剛 タモリ