15.8. Managing DNS Settings
If the DNS server names are retrieved from DHCP or PPPoE (or retrieved from the ISP), do not add primary, secondary, or tertiary DNS servers.
If the hostname is retrieved dynamically from DHCP or PPPoE (or retrieved from the ISP), do not change it.
Warning
If the hostname is changed and system-config-network is started on the local host, you may not be able to start another X11 application. As such, you may have to re-login to a new desktop session.