[$] Fedora and fallback DNS servers
One of the under-the-hood changes in the Fedora 33 release was a switch to
systemd-resolved for the handling of DNS queries. This change should
be invisible to most users unless they start using one of the new features
provided by systemd-resolved. Recently, though, the Fedora project changed
its default configuration for that service to eliminate fallback DNS
servers — a change which is indeed visible to some users who have found
themselves without domain-name resolution as a result.