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An 80-page manual, you need at least one year to read, ponder and practice, but you can still only appreciate the surface. Therefore, many old men and horses will read the manual over and over again and practice it over and over again.除了《寻秦记》这个亮瞎人眼的存在外，启明上，其他小说的销售数据也还是挺不错的。尹智莉为参加闺蜜李朵拉的婚礼来到如月别墅，却意外发现新郎林邱墨有着与自己男友张霄一样的脸。新郎与伴娘似乎关系密切，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.