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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.静夜中传来一阵狗叫，青木等人又出谷去了。听了一会，才明白他们是何许人，为何要关注张家，仇恨红椒。Green system: bluegrass and turmeric, bluegrass and Phellodendron amurense, kudzu vine高易唯恐生出变故，急忙赶到香溪镇来报讯　　武林群雄並起，魔妖亂舞，黑獄、無始暗界紛紛入世，戰雲界更傾巢而出，各方勢力角逐中原。天佛原鄉內部，又將開啟怎樣的秘密？玉海九輪盤出現，欲界的精神象徵，是否代表著魔佛波旬即將再度武林？武林陷入前所未有的戰局。素還真現在又在哪裡？一頁書又將如何反撲？讲述了一个美国国防部高级研究计划局科学家接受一项致命任务，带领一队精挑细选的三角洲部队士兵进驻一个被战争摧毁的城市，这里游荡着被称为“幽冥”的神秘幽灵，它们无形无色，能在不经意间造成大规模的伤亡。