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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.年轻的网络设计师陶侃（陆毅扮演）在一次作品比赛中结识了柳翠芸（蒋虹扮演）。两人为一件作品产生争议，互不服输，成了“冤家”。陶侃与好友，香港青年何嘉林（陈浩民扮演）、杨慧敏（叶璇扮演）成立了青春网销公司，立志要在这一新兴行业中有所作为。不料，翠芸工作的欣欣房产公司与青春公司恰在同一幢办公大楼内，陶侃和翠芸，冤家路窄，两人一见面就相互嘲讽……When you change the shutter speed, you also change the way moving objects are recorded on the negative.4. Do not know that the goal is too high,几番对答，大苞谷算是看明白了，这老皇帝性子多疑的很。The six-way model is not given only by the six immortals. The ten-tail column force can also be opened.