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Before, I saw a friend say that it would take effect when it was very positive. So the landlord went to test. The results are as follows:In other words, scarcity will capture a person's brain.一瞬间后苍老的身体猛然一阵，手中的拐杖也哐的一声掉在地上。"Good, good, great! I like to hear grandma tell stories best!" As he spoke, he happily cocked his two little feet and went up and down.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.香儿吓坏了，大叫道：秦哥哥，不要去。