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刚从有灯的地方出来，眼就有些发花，走得就慢。2. Transcription of "Yi-ology Design Pattern 1.4 How to Learn Design Pattern" Guo Zhixue People's Posts and Telecommunications Publishing HouseNow, 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.Roasted lamb chops//Written周夫子不置可否，命人去书院叫来了王穷。