AlmaLinux OS 9 must configure a DNS processing mode set be Network Manager.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| medium | V-269288 | SRG-OS-000480-GPOS-00227 | ALMA-09-023560 | SV-269288r1050170_rule | 2026-02-27 | 1 |
Description
To ensure that DNS resolver settings are respected, a DNS mode in Network Manager must be configured.
ℹ️ Check
Note: If AlmaLinux OS 9 is configured to use a DNS resolver other than Network Manager, the configuration must be documented and approved by the information system security officer (ISSO).
Verify that AlmaLinux OS 9 has a DNS mode configured in Network Manager.
$ NetworkManager --print-config
[main]
dns=none
If the "dns" key in the [main] section does not exist or is not set to "none" or "default", this is a finding.
✔️ Fix
Configure NetworkManager in AlmaLinux OS 9 to use a DNS mode.
In "/etc/NetworkManager/NetworkManager.conf" add the following line in the "[main]" section:
dns = none
NetworkManager must be reloaded for the change to take effect.
$ systemctl reload NetworkManager