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V-271860

CAT II (Medium)

OL 9 must configure a DNS processing mode set be Network Manager.

Rule ID

SV-271860r1092292_rule

STIG

Oracle Linux 9 Security Technical Implementation Guide

Version

V1R5

CCIs

CCI-000366

Discussion

To ensure that DNS resolver settings are respected, a DNS mode in Network Manager must be configured.

Check Content

Verify that OL 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.

Fix Text

Configure NetworkManager in OL 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