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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.This is a problem. Due to the homologous policy, the iframe content cannot be loaded at all, so the form submission inside will certainly not be executed.由芒果娱乐出品，湖南卫视寻宝偶像剧《珠联璧合》正在紧张筹备中，并更名为《夺宝奇缘》。故事以寻宝为线索，讲述了一对欢喜冤家浪漫而又刺激的冒险旅程。@南派三叔 任文学总监，男女一号暂定为蒋劲夫、郭雪芙。该剧已定档湖南卫视青春进行时剧场，原定9月15日开机可能会推迟到10月中，11月24日播出。但见小雪莲随着黛丝不停旋转、扭动，一大一小仿佛配合了多少回一样。　　一场风暴即将向这个看似幸福的富贵之家袭来……耿星光是村里的一个牛倌，是那种凡事喜欢一条道跑到黑的人。因为不满村长刘眼镜欺负自己的行为，萌生去大城市打工的念头。刚来到大城市四处碰壁，从建筑工地、饭店再到洗浴中心，干过许多不擅长的工作，出了不少笑话。但他善良、真诚、宽容，从不放弃努力，最终在洗浴中心找到了适合自己