Firewalld

• Firewall daemon | firewall-cmd is the command line client for firewalld and provides a method to manage the configurations.
• firewall-cmd --list-all (run as sudouser) shows the default firewall rules.

Commands we need to know for firewall-cmd

• firewall-cmd
• --list-all
• --reload
• --add-service=(blank)
• --add-service=(blank) --permanent
• --add-port="port"/"protocol"
  • --add-port=80/tcp (example of http)