RHEL 9 must configure a DNS processing mode in Network Manager.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| medium | V-257949 | SRG-OS-000480-GPOS-00227 | RHEL-09-252040 | SV-257949r1014841_rule | 2025-02-27 | 2 |
| Description |
|---|
| In order to ensure that DNS resolver settings are respected, a DNS mode in Network Manager must be configured. |
| ℹ️ Check |
|---|
| Verify that RHEL 9 has a DNS mode configured in Network Manager. $ NetworkManager --print-config [main] dns=none If the dns key under main does not exist or is not set to "none" or "default", this is a finding. Note: If RHEL 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). |
| ✔️ Fix |
|---|
| Configure NetworkManager in RHEL 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. $ sudo systemctl reload NetworkManager |