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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.怎么样？同意的话，我就把这里租给你。有何不好？这三股倭寇。At the beginning of marriage, it must be beautiful and happy. Only in the process of marriage, both parties constantly hurt it, it will collapse.在山yīn歇息一会，尹旭便带着苏岸等人进入会稽山里面，向着所谓的清溪谷进发，前去寻找那位传说中的铸剑大师诸先生。自称“天下第一恶”的江小鱼自小生活在恶人谷，在十恶李大嘴等人的抚养下，终日好整蛊恶搞，油嘴滑舌，却心地善良、纯真可爱。小鱼儿行走江湖，与英气逼人的花无缺不打不相识。随着接触深入，小鱼儿和花无缺变成一对亦敌亦友的朋友。原来花无缺从小被移花宫主邀月收养，授其武功，宫主为了报复花无缺和小鱼儿的生父江枫，故意将二人分开抚养，待二人长大相互残杀。与此同时，江别鹤、江玉郎两父子正谋划着一场更大的武林阴谋，螳螂捕蝉，黄雀在后，一场事关武林生死存亡的腥风血雨旋即展开。小鱼儿与花无缺终于识破了宫主的阴谋和诡计，携手平息了江湖的恩怨与挑战。