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The probability of understanding is 0% by default, and the damage rate after understanding is 125% by default.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.时值乱世，一个被遗弃的野孩子在森林里由豹子抚养，后经猎户收养。孩子虽渐渐懂得一些人性，但身上挥不去那份兽类的野性，以至于后来不得不在军队中角斗场靠格斗为生，而残酷的逆境恰好造就了日后无人匹敌的勇猛战将，名叫“天涯”。与之相对，大将之女“蝶舞”自小与“天涯”有着不解之缘，这位日后的大美女为了让天涯放弃斩不断的所谓恩义远离尘世，甘愿做他人使用美人计的一颗棋子……Try {板栗见妹妹沉默，也有些惆怅，伏在椅子背上不语。我们现在当务之急的事情是处理好淮南和中原的战事非常識宴会 石黒賢 河原さぶ