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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.左都御史庞家本来不愿插入胡家和张家纷争的。10 yuan birthday banknote只要城内有异动，立即炸开城墙。1937年卢沟桥事变爆发，日本大举入侵中国。中国到了生死存亡的关键时刻，国民党内部的腐败再也掩盖不住了，空军在穷兵黩武的日本面前不堪一击。一个中学女生发现自己喜欢上了另一个女孩，她开始质疑自己的性取向，并选择通过社交媒体来寻找答案。Paravi原创故事《恋爱的男人们》的主人公是8个男性。《恋爱的母亲们》以女性视角展开，而《恋爱的男人们》则以男性视角展开故事。男人为什么失踪，男人为什么喜欢上了结婚的女性，男人为什么和妻子以外的女性有关系……”要注意的是，以男性为主，本篇不会描写“麻烦”的恋爱故事。