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30Now, let's imagine why these "checkpoints" are called "chains" in iptables. As we know, The purpose of a firewall is to match "rules" for passing messages, Then execute the corresponding Action, So, when the message passes through these checkpoints, You must match the rules on this level, However, there may be more than one rule on this level, But there are many rules, When we put these rules in a chain, A "chain" has been formed. Therefore, we imagine each "checkpoint" as shown in the following figure. In this way, it is more appropriate to call them "chain". Each message passing through this "checkpoint" must match all the rules on this "chain". If there are qualified rules, the corresponding actions of the rules will be executed.《猎鹰1949》主要讲述了解放初期，国民党残余势力不甘失败，派遣特务潜伏于刚刚解放的大西南，纠集土匪啸聚山林，伺机而动，我特务营营长燕双鹰（张子健饰），以过人的胆识，超人的智慧和对党绝对的忠诚，巧妙的与敌周旋，潜伏于敌人内部的故事。《猎鹰1949》又被看作钱雁秋执导的电视剧《英雄》的续集。In this section, we will learn about the event module. Event module is mainly used to detect some event operations from other modules. It is generally used as the basis for starting programs and is also a relatively simple module. There are also fewer building blocks. We will introduce them one by one through the following diagrams:个性叛逆的新兵高等入伍后，因不适应部队生活而被分到了位于深山中的修理班，邂逅了身怀绝技的老兵林峰。两人从针锋相对到惺惺相惜，逐渐成为了一对好战友。为了保证边境人民生命财产的安全，部队组织扫雷队清扫残留雷场，两人一起下山为扫雷出力，做出了巨大贡献。随后，二人又加入了勘界扫雷保障小组，率领战友们打通了勘界通道，扫除了新立界碑点周围的雷场，圆满完成了勘界立碑的重要任务。在排雷过程中，林峰为救边境儿童不幸牺牲。高等继承其遗志，刻苦训练，努力工作，成为了一名优秀维和士兵，用汗水和血水谱写了一曲当代中国军人的英雄赞歌。传说远古一段时间，正气衰竭之暗黑期，邪王横行。花错一心灭魔，因此创办神剑山庄广收弟子，更将神剑山庄交弟子无邪处理，改法号无间守住魔道出口。天庭百懂仙见人间苦难，私下人间，化名为大师，开设仙药巷，施医赠药，甚为百姓欢迎及歌颂。某日，大师前往神剑山庄禁地天囚山，欲协助无间感化暗黑邪王，但被邪王元神上身，自此之后，大师性情大变，滥杀无辜，黑白不分。大师在人间之种种行为惊动了天庭，玉帝派观音大士到人间把大师押回天庭……《神医大道公》是以保生大帝的故事为题材创作的大型古装神话喜剧，是第一部展现保生大帝故事的电视剧。本剧是两岸第一部正式合拍的电视剧，两岸正式开放影视合作政策之后。第一部与台湾合作的电视剧，同时这也是台湾主流电视台第一次以预购版权的方式参与两岸电视剧的合作，开创了两岸戏剧合作的新模式。