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In the course of practice, Teacher Sun Yimin said more than once, "I hope our practice can make more students pay attention to employment and entrepreneurship. "There are priorities in learning and specializing in technical fields". Everyone's value is often reflected in different aspects. We should find our own way and direction instead of blindly following the principle of postgraduate entrance examination. Industry is also the top priority of the country's development. Investment in industry can also achieve a career! " As a retired old teacher, Mr. Sun, who was supposed to live a leisurely life at home, was still able to stay far away from the "Jianghu", worried about his "monarch" and still chose to devote himself to student work. Such a mind is really admirable!Hot spring eggWe 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.When switching the background, make some changes to the color of the characters. In this program, we used the building blocks of most event modules. Of course, you can also add some background music according to your own needs.三人因为维托的公寓被查出藏有毒品一事，而联系在了一起。慢慢被道出来的是三人不堪回首的过往，残留在现在的却是嘴边的微笑，面对伤痛和不公，惟有笑着活下去，一出温暖的治愈故事微笑含泪绽放。