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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.BaiDuInterview.prototype.init = function () {瀛洲界内，诸子百家，唐诗宋词，皆有书灵。在《唐诗三百首》中醒来的书灵顾七绝，骑着《山海经》的神兽驳， 与为了养活自己和一群妹子而努力奋斗的乐五音一起踏上了一条寻找唤醒其他书灵的道路。　　《希瑞与非凡的公主们》讲述了孤儿阿多拉（卡莉罗饰）的故事，有一天她发现了一把魔法神剑，可以让她变身为神秘战士公主希瑞，便脱离了此前生活的邪恶的霍德王国。一路走来，她在反抗军中找到了新的家人，她集结了一群魔法公主，与邪恶力量展开终极斗争。周琉率兵出击，到底是赵文华的命令，还是自作主张。Some related concepts are described here first.六扇门主事曹雄（张铁林 饰）召开武林大会欲统领江湖。各大门派赶赴大会，点苍派师徒一阳子（刘松仁 饰）和徒弟马君武（梁朝伟 饰）亦于其中。师徒两人遇上天龙帮突袭，幸得白云飞（梅艳芳饰）相救。其后白更答应往桃花潭捕捉千年灵龟，以解众掌门之毒。几经辛苦，3人终捕得灵龟，岂料又被蓝小蝶（关芝琳 饰）利用琴音夺走，扬言要白亲自去取回。此时，由于曹雄误传归元秘籍为白云飞所有，于是追杀白云飞的武林行动也展开了。而曹雄学得绝世武功，无人能敌......