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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.若是你姓陈，那可就难说了。She notes: "I like when there is no need to insert on what what I'm doing is right or not." Some people believe that if do a special task is in one's blood-the way eating or sleeping comes naturally-then one should it "; and that perhaps we remind ourselves to" hang on "to some things only to compensate for a lack of genuine interest or love for them.故事发生在麒麟艺术高中内，无数光彩夺目的明星们从这里起步，展开双翼追寻他们的梦想。然而，残酷的现实和巨大的经济压力使得学校的经营几乎瘫痪，老师们纷纷跳槽，前往其他的艺术学校，只有大大咧咧的杨真万（朴振英 饰）留了下来，和校长朱正万（全海孝 饰）一起为了维系学校的荣誉而努力奋斗着。申海星（姜索拉 饰）虽然歌艺平平，却对自己的音乐梦想十分执着。JB（林宰范 饰）的肩上所背负着的，不仅有自己的未来，还有父亲的期望。想要成为戛纳女王的莲（朴智妍 饰），整日里神神叨叨将音乐作为通灵媒介的朴顺童（刘小英 饰），这些善良开朗的年轻人们站在了擂台之上，一场激烈的音乐比赛正式拉开序幕。CA1, …-Only when one has experienced the test of life and death, or seen where will you go's joys and sorrows, and has the courage and confidence to live, can one say frankly: Grandma's!