Please explain the options for Red Hat's default firewall
Okay, in Red Hat 8.0, I got to System Settings -> Security Settings, enter root password and a dialog pops up listing my options for security level configuration. I notice that My Security Level is set to high and I have "use default firewall rules" selected rather than "Customize"
The thing is, I don't know what security level "High" does differently than "medium" and since I don't know what the options are that are available if and when I choose "Customize" I'm restricted to using the default firewall rules.
Can somebody please explain to me what security measures are in place with my current settings, or give me a link or something to someplace that can tell me? Thanks