iptables和firewalld的介绍与区别

背景：
在Windos 上连接 CentOS 上的mysql 失败，问题是linux防火墙没有关闭，
但是systemctl stop firewalld后还不是行，运行service iptables stop就可以连接

linux 版本：

[root@localhost wwwroot]# cat /etc/redhat-release
CentOS Linux release 7.8.2003 (Core)

iptables和firewalld的介绍与区别：

https://blog.csdn.net/Bilise/article/details/105372667?spm=1035.2023.3001.6557&utm_medium=distribute.pc_relevant_bbs_down.none-task-blog-2_defaultOPENSEARCH_{Rate-3.nonecase&depth_1-utm_source=distribute.pc_relevant_bbs_down.none-task-blog-2}default_OPENSEARCHRate-3.nonecase

https://blog.csdn.net/lishuan182/article/details/111581728?spm=1035.2023.3001.6557&utm_medium=distribute.pc_relevant_bbs_down.none-task-blog-2_defaultOPENSEARCH_{Rate-1.nonecase&depth_1-utm_source=distribute.pc_relevant_bbs_down.none-task-blog-2}default_OPENSEARCHRate-1.nonecase