iptables是针对Linux防火墙 netfilter的管理配置工具。在进行iptables防火墙设置前，必须打开系统内核的IP转发功能，使系统成为路由器。-iptables is the firewall for Linux netfilter configuration management tool. Before making iptables firewall settings, you must open the system kernel' s IP forwarding function, the system is a router.