首先掌握firewalld的区域和服务概念，再使用iptables管理数据包过滤规则，最后永久应用规则并测试连接。If you're new to Linux firewall configuration, learn how to use firewalld and iptables: 1. Understand the basics of zones and services in firewalld. 2. Use iptables to manage packet filtering rules. 3. Apply rules permanently and test conn
ectivity.