Description of problem: In version 2.31 of GLIBC the option "trust-ad" was added and is now being set on new installations. On a default fedora 33 installation, this is the contents of /etc/resolv.conf: [~]$ cat /etc/resolv.conf # This file is managed by man:systemd-resolved(8). Do not edit. # # This is a dynamic resolv.conf file for connecting local clients to the # internal DNS stub resolver of systemd-resolved. This file lists all # configured search domains. # # Run "resolvectl status" to see details about the uplink DNS servers # currently in use. # # Third party programs should typically not access this file directly, but only # through the symlink at /etc/resolv.conf. To manage man:resolv.conf(5) in a # different way, replace this symlink by a static file or a different symlink. # # See man:systemd-resolved.service(8) for details about the supported modes of # operation for /etc/resolv.conf. nameserver 127.0.0.53 options edns0 trust-ad Unfortunately there is no reference to this in man 5 resolv.conf (nor in man 3 resolver, though this appears to be missing upstream as well in the change set - https://gnutoolchain-gerrit.osci.io/r/c/glibc/+/461). The updated man page can be referenced on Michael Kerrisk's site: https://www.man7.org/linux/man-pages/man5/resolv.conf.5.html The lack of this information presents a challenge to users auditing behavioral changes between different hosts running Fedora. Version-Release number of selected component (if applicable): [~]$ rpm -q glibc glibc-2.32-1.fc33.x86_64 [~]$ cat /etc/os-release NAME=Fedora VERSION="33 (Workstation Edition)" ID=fedora VERSION_ID=33 VERSION_CODENAME="" PLATFORM_ID="platform:f33" PRETTY_NAME="Fedora 33 (Workstation Edition)" ANSI_COLOR="0;38;2;60;110;180" LOGO=fedora-logo-icon CPE_NAME="cpe:/o:fedoraproject:fedora:33" HOME_URL="https://fedoraproject.org/" DOCUMENTATION_URL="https://docs.fedoraproject.org/en-US/fedora/f33/system-administrators-guide/" SUPPORT_URL="https://fedoraproject.org/wiki/Communicating_and_getting_help" BUG_REPORT_URL="https://bugzilla.redhat.com/" REDHAT_BUGZILLA_PRODUCT="Fedora" REDHAT_BUGZILLA_PRODUCT_VERSION=33 REDHAT_SUPPORT_PRODUCT="Fedora" REDHAT_SUPPORT_PRODUCT_VERSION=33 PRIVACY_POLICY_URL="https://fedoraproject.org/wiki/Legal:PrivacyPolicy" VARIANT="Workstation Edition" VARIANT_ID=workstation
I submitted a patch to the man-pages project: https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/commit/?id=a3f91ca97b6fe81da1598e4c3c3af9ed199d1338 It's not been long ago, so it's probably not yet in Fedora.
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This is fixed since man-pages 5.10, in Fedora 34 and up.