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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."You said 'similar'? Does it mean that in addition to the unknown creatures that attacked you twice before, there are new unknown creatures' participating in the war '?" I asked.2. Expansion in different places faces problems such as store selection and different policies for running schools in different places.郑氏愤愤地说道：就是。This individual refers to the fourth level, and I will talk about it later.犬の穴 浅田美代子 三浦友和I asked Ah Qi, does your husband know that the company is cheating? "She said