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Ma Jinyu: Firewood, our big firewood.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.阳庄遭回刀门血洗，庄主叶子文遇害，女儿相雨长大后，誓要为父亲报仇，迫得回刀门门主重披战衣，大开杀戒风云变幻，一个平静夜空，几条身影飞掠向双阳庄屋檐瓦顶，就在山庄满庭笑语，觥酬交错庆元念祖弥月之喜中，几柄回旋刀银光闪烁，光芒盘旋闪掠过处，血腥四溅，尸横遍地。双阳庄庄主叶子文及其义弟元人敬拚死护庄，迎战敌人，但来者不善，还没看清楚敌人来路，山庄上下一百多口人已经是死伤不计其数，对方好像誓必对山庄赶尽杀绝，杀个寸草不留！Stay with your horse and try it back.在她脸上亲了一口，简直热泪盈眶。其中一个坟头上趴着一个白影，好似女人侧卧的样子，正对着他们，还微微晃动，似乎没有一点重量，飘来飘去的。