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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.周菡红了脸，嗔怪道：王爷这样就知礼了？命冰儿倒茶来给他喝。谁规定劝夫君就是一个样子了？田夫子捻须的手一顿。刘邦坐直身子，在窗口问道：樊哙，我们现在在哪里？是往哪里走？樊哙驰马来到近前，说道：汉王，现在是在彭城西南方向，往萧县去。李胜男面对男友的求婚,一夜之间带着闺蜜不知所踪,至此3女与6男的追逐游戏感情。忽然问道：王翰林也为家族费心，是不是希望将来位极人臣？王穷摇头道：在下以前疏懒的很，并未立志出仕。绷脸道：你不是才吃的元宵和馄饨？小葱也觉得这个借口不大好，但话已经出口，收不回来了，耍赖道：那碗小的很，元宵在我煮馄饨的时候就消化光了。