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We know that IPTables acts according to rules. Let's talk about rules. Rules are actually predefined conditions for network administrators. Rules are generally defined as "if the packet header meets such conditions, this packet will be processed in this way". The rules are stored in the packet filtering table in kernel space, specifying the source address, destination address, transport protocol (such as TCP, UDP, ICMP), service type (such as HTTP, FTP, and SMTP), and so on. When packets match the rule, iptables processes these packets according to the methods defined by the rule, such as accept, reject and drop. The main task of configuring a firewall is to add, modify, and delete these rules.There is another example of students deliberately practicing learning English. Although the methods are different, the results are indeed extremely good.‘我先走了……我会等你……我们生死相依……冷漠如同神魔的邀月来了，江枫再无一丝生机的时候，花月奴含笑说道。Why is feedback so useful for deliberate practice? In the article "Failure is not the Mother of Success, Success is the Mother of Success" by Teacher Wan Weigang, it is stressed that feedback is divided into two types: one is to accuse you of not being able to do it yourself, and this feedback will bring bad effects. 2 refers to the right thing, not that you can't do it, but that what you do can be better promoted through improvement. Effective feedback is that "good is failure" needs to meet three conditions. 1. Timely, if it is wrong, someone will point it out to you immediately. It is not right for people to be right for things. The cost of mistakes is small. This is more like the green light thinking in the learning mentality. To distinguish between "I" and "my view of behavior". I am very good myself, and my behavior and opinions can be changed.Paul与Monica每日在地铁内相遇，二人由互不相识而成为恋人。Anita 虽知Paul与Monica相恋，仍不灰心，时常借机亲近Paul，又向 Paul之父母大献殷勤。另一方面，Monica亦不断受到Ben及新公司同事吴威(陈友饰)苦苦相缠，在种种外来压力困扰之下， 一对恋人时常发生误会，感情起了波折. Monica 苦恼非常，终于决定暂时放下感情重担， 过回从前一个人的生活…