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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.当真是太过执拗了，同时也感叹，赵王歇当真是瞎了狗眼，这样忠诚勇武的将领不好好重用，偏偏要去宠信那些那些小人。1. Support simple broadcast communication. When the state of the object changes, it will automatically notify the subscribed object.First of all, dig Thailand: