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小葱听见公婆都来了，慌忙也叫道：娘。胡钧听不到她的回答和响应，不安地问：林兄弟，你不喜欢这地方？林聪见他期待地看着自己，忙掩饰地强笑道：这个……将来的事，谁能说得清呢，谁知会有什么变化？不自觉地，她眼前浮现泥鳅清秀的面庞和李敬文实诚的笑脸。2018-03-02 16:42:24顾涧看不下去了，带着黎章等人上前问究竟。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.Little Charlie pouted and nodded.