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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.我没脸活了。于是四人便将地下的灯都灭了，顺着来路回去，各自歇息不提。　　黑龙江省边境小镇黑河，在时任警备司令的马占山治理下，百姓安居乐业，却不料日军悍然发动“九一八事变”。马占山临危受命，被任命为黑省代主席，总揽军政。只要气质和风度足够好，相貌便是微不足道的小问题了。付宇锋接过这只肥兔子，一脸不高兴，小声嘀咕道：本来是买来吃的，现在却好，像大爷一样伺候着。怎么？你将来想过皇帝瘾么？……裕王落座，诚惶诚恐望向众臣。