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In the 2008 issue of Baby Behavior and Development, Professor Michelle Heron and VirginiaSlaughter described their experiment in which boys and girls of different ages classified cars and dolls of various shapes.Captain of men's singing group BIGBANG, G-Dragon Quan Zhilong. (Philippine market)"Highway"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.? Second, create an implementation class: