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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.人生发生逆转，最后取得成功。1992年的一座大奥兰多小镇上，水上乐园底薪员工克丽丝朵·斯塔布斯 (Krystal Stubbs, 克尔斯滕·邓斯特 饰) 迫于生计加入美国创始人商品公司 (Founders American Merchandise, FAM)，通过坑蒙拐骗在这个层压式推销组织里努力升级——而这场数十亿美元的金字塔骗局正是当初导致克丽丝朵家破人亡的罪魁祸首。这个故事是讲前世今生的 有一个名为Pinkaew的手镯出现 Pinlada是前世女主的名字一天晚上，一直默默无闻的高中生抓住机会改变自己，开始过上精彩生活。然而第二天早上，她发现自己居然成了幽灵…这是在搞什么鬼？！周芷若一直在吃老本，昔日汉水舟中，喂饭之义，赠帕之情，让张无忌对她念念不忘，对她有一种莫名的情愫。罪恶黑名单第九季