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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.其实每个人都是木偶，只不过很多人看不见牵在自己身上的线罢了……当越国都城正是迁到洪都的时候，洪都城已经一片繁荣。是怕伤了两人之间的感情。故事描述特工处探员Ethan Burke来到乡村小镇Wayward Pines（即本剧剧名）寻找两名神秘失踪的联邦探员。他没有得到想要的答案，反而遇到了更多的问题。这个地方就像有某种魔力一般，Ethan距离真 相越近，就越丧失自我——就连他的性格都变了。他不得不面对可怕的现实：他可能永远无法活着离开这地方。 @TheTaoSong"I think so, But it was too late, I'm sitting here and I'm telling you, It is said in a straight-forward way, But when this happened, Basically between crackles, The company commander's military quality is so strong, Also see in the eye can't help, He saw that the three men could not be saved, I think he is also in a hurry, From behind, he grabbed a three-piece explosive cartridge, Unscrewed the back cover, pulled the lead and held it on his shoulder, just like the javelin thrower in the Olympics. He threw the cartridge sideways, He threw such a heavy thing so far away, It's almost farther than I threw a grenade, Because I don't know how many times the front of the position has been ploughed by artillery, Full of floating soil, It's very soft, So when the explosive cylinder landed, it was finally inserted obliquely on the ground. It was also impartially inserted in the most densely populated position of the group of strange dogs, Then the explosive barrel exploded, which was quite powerful. I felt that it was more powerful than a shell. The width of the whole position was completely covered by 10 meters in front of it. On the spot, the strange dogs that were still biting the body and rushing halfway were all killed. My military cap was blown off by the shock wave. "Wang Zeduan said.长大的龙小云被招为相爷的乘龙快婿，但成亲当晚，相府千金离奇死于小李飞刀之下，龙小云被卷入其中，李寻欢义无反顾，重出江湖，访查真凶，但却仍被小云误解怨恨。在与冷月宫宫主江怜月的争斗中，李寻欢得到关天翔的相助，关甚至不惜为救小云失去武功，李寻欢感激之余，以为知己，两人结为兄弟。尾随而来的却是起伏不定的江湖风波。