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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.1 ReplayAdd a rule at the end of the specified chain of the specified table. The-A option means that the rule is added at the end of the corresponding chain. When the-t option is omitted, it means that the rule in the filter table is operated by default.两个随从进巷后，不多一会就出来了，回报说人不见了，但他留心问了人家，说是看见两个小乞丐进了济世堂的后院。说话间目光落到周围的shì女仆役身上，显然谈话涉及到一些机密，这些人在场并不合适。顿时，银幕上出现了一些回忆的片段。