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We call a collection of rules that have the same functionality a table, Therefore, we can place rules with different functions in different tables for management, and IPTables has already defined four tables for us, each table corresponds to different functions, and the rules we define cannot escape the scope of these four functions. Therefore, before learning IPTables, we must first understand the function of each table.Netfilter/iptables (hereinafter referred to as iptables) constitute the packet filtering firewall under Linux platform. Like most Linux software, this packet filtering firewall is free of charge. It can replace expensive commercial firewall solutions and complete the functions of packet filtering, packet redirection and network address translation (NAT).七里滩也好，眉城也好，众将士都忙得热火朝天，不仅要安置看押俘虏。Other Conditions for Recognition of Teacher Qualification Certificate淼淼还小，秦大夫说不定会等两年才肯帮她聘人家。沈悯芮云淡风轻笑道，守城的戚将军，可是天下最顶天立地的真男儿。When I think about this matter again, I feel that he is lucky in the real misfortune. He is more deadly than Jiang Yong in the position where he was splashed. However, due to the self-help measures taken and the help of some people, he was lucky enough not to be seriously injured in the end.