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1.2. View current status and settings firewalld 1.2. 1. View the current status firewalld Firewall service firewalld is installed in the system by default. Use the firewalld CLI interface to check that the service is running. [root@kittod ~]# firewall-cmd --state running For more information about service status, use the systemctl status ...

1, Introduction to fire wall In Linux, the firewall strategy is implemented based on netfilter. 1. netfilter: there is a security plug-in netfilter (access control list) in the kernel. There are many detailed rules in this list. When this rule is allowed or denied, it can control whether other hosts can access, which greatly improves the s ...