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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.If conditions permit, it can have corresponding equipment, connect off-site members in real time, conduct video dialogues (such as video conferences), and share on-site data (such as pictures and reports) with off-site personnel.Then dig Malaysia:骂卓一航的帖子依然很多，不过令陈启意外的是，置顶帖中有一个帖子名为《被低估的卓一航》。In recent years, the concept of 10,000 hours has become very popular, but the actual 10,000 hours is not a universal truth. There are many restrictions. Most people do not know that 10,000 hours under "deliberate practice" are only useful. However, there has been a lack of systematic exposition on how to practice deliberately. Many books are relatively simple, and this book focuses on this topic. Deliberate practice is a higher-level learning method, which can make you improve your learning effect and shorten your learning time in a short period of time, and make you go to the road to excellence.* * Please name the name in Latin, Chinese translation from Baidu * *Black line: jiuxiong* …