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Now, 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.她想，最好有个盒子，用别的东西装，容易将点心压烂了。阿基巴（藤原龙也）曾经收购了大型收购，引起了世人的骚动，现在作为应用程序的开发，作为主要工作的自由人，过着安静的生活。秋叶原住着的是经营倾斜的人才派遣公司的老板·科乌西罗（杉野遥亮）的办公室。那里是整修旧游戏中心的地方。她聚集了美女，开了聚会和吃饭会，和有钱人和成功的经营者做人脉，使人生一下子逆转，梦想着作为创业者成功。正在发愁的事情，徐家正好巴巴的赶来向自己请罪，很显然他们也很清楚，这才是眼下尹旭最想得到的东西。Alert ('one ');为了生存和梦想，复员回家的铁振国和兄弟铁头、高中一起到北京工地打工。在工地里，一点建筑基础都没有的铁振国忍辱拜师，苦练技艺，在导师马一方的教诲和自己的琢磨下，成长为一名优秀的建筑工人。然而，一次意外事故又让他几乎丧失劳动能力，从事业的高峰跌入人生谷底，所有的梦想都濒临破碎。高中通过考大学重新进入城市，并成为一名建筑设计师，前途光明的他却在名利的诱惑下，一步步走上了不归路，甚至不惜与铁振国为敌。经历情感打击、兄弟反目，铁振国凭借身上那股不服输的劲儿重新回到曾经让他满身伤痛的北京，带领着一群家乡人开始了艰苦卓绝的创业历程，书写了一代建筑铁军的追梦之旅。222. X.X.81