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The RFFE specification provides an integrated, flexible solutionNow, 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.求一下三江票和收藏。板栗见他们争个没完，这样下去也不是个事，只得上前道：天尊地卑，男尊女卑，这是没错的。山野烂漫，梨花盛开，爱人携手，共赏繁华……即便‘公关这个词并不怎么好听，也不像是什么特别好的职业，但徐风依旧不愿跳槽。这一期的《倚天》，她已经看了三遍。