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So let's explain the rules of iptables in a common way. There was an analogy before, Each "chain" is a "checkpoint", Every message passing through this "level" must match the rules on this level. If there is a match, The message is processed correspondingly, For example, you and I are like two "messages" at the moment. Both of you and I are going to enter the customs at this moment. But the duke has a life, Only the imposing person can enter the customs, Those who do not meet this requirement are not allowed to enter the customs. So the soldiers guarding the customs followed the "rules" formulated by the duke. I began to look at you and me. In the end, you entered the customs smoothly, and I was rejected. Because you met the standard of "dignity", you were "released", while I did not meet the standard, so I was not released. In fact, "dignity" is a kind of "matching condition", "release" is a kind of "action", and "matching condition" and "action" form the rules.周杰伦十几年音乐历程总结在温暖与残酷之间游走，在现实与理想间对决。哭泣者心有余温，狂奔者手捧玫瑰，感恩者上下求索——所有人都在寻找自己的对手。This is the key to the development of Shanghai's manufacturing industry.但是我赞同蒲俊和伯洲两位将军的想法，那就是此次要速战速决，现如今我越国不宜陷入持久消耗的作战之中。这时，陈启已经开始为下本书做准备。。。。叔叔壮烈的异世界生活和侄子敬文的新感觉异世界喜剧拉开了帷幕！