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Firewalls

Resources

firewalld

• 4.5. 使用防火墙 - Red Hat Customer Portal
• How To Set Up a Firewall Using FirewallD on CentOS 7 | DigitalOcean
• RHEL7: How to get started with Firewalld. - CertDepot

iptables

• HowTos/Network/IPTables - CentOS Wiki
• How To Migrate from FirewallD to Iptables on CentOS 7 | DigitalOcean