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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.《摩斯探长前传》第五季将于2018年2月回归ITV，本季共六集，剧情以1968年为背景。The main contents of this program:怎么说？还是船主管的好啊，纪法严明，因地制宜，及早规划，有库房有货港，有街市有营房。Nmap Idle Scan若秦枫不是皇叔，那就好办，管他什么婚约，当然以圣旨为准了。2. Is it better to find a decoration company or to be private-shortcomings of the decoration company