(RedHatLinux provides firewall maintenance for adding system security. Firewalls exist between your computer and the network to determine which resources on your computer remote users on the network have access to. A properly configured firewall can greatly increase your system security.
Choose the appropriate security level for your system.
"Premium"
If you choose "High", your system will not accept connections that are not specified by you (except for the default settings). As long as the following connections are permitted by default:
DNS answer
DHCP—Any network interface that uses DHCP can be configured accordingly.)
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