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先生，果如你所料，魏军有动作了，已经在悄悄的准备撤军了。Memory shutdown!失去母亲的淑美和淑然两姐妹，和父亲住在一幢偏僻的郊外别墅里，过着一种古怪的生活。别墅孤零零地矗立在野外，非常冷清，每到夜晚，四周就一片漆黑，还不时传来恐怖的声音，令人胆战心惊。自从母亲离开后，淑美和淑然的性格就变得非常忧郁，姐妹俩也超乎寻常的亲密。System.out.println ("cpu startup! ");23Now, 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.Learning thinking and learning methods are very important, resulting in three situations of confusion and poor harvest: short contact thought comprehensive, incomplete mastery eager to overthrow, insufficient comprehension and rhetoric, and the most important thing in learning is to keep a large period of time and practice deliberately patiently and modestly.