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郑氏来的途中已经听山芋说了事情经过，心忧如焚，及至面对这黑少年，感觉既陌生又亲切。《世上最美丽的离别》讲述一位平凡的母亲在人生的最后时光里，与家人重归于好享受最后亲情的感人故事。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.韩元帅，你总算是回来了。How to Learn Design Patterns一个关中，或许不到现在也过版图的三四分之一