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RHEL-09-252040 - RHEL 9 must configure a DNS processing mode in Network Manager.
Information
To ensure that DNS resolver settings are respected, a DNS mode in Network Manager must be configured. The following are common DNS values in NetworkManager.conf [main]:- default: NetworkManager will update /etc/resolv.conf to reflect the nameservers provided by currently active connections.
- none: NetworkManager will not modify /etc/resolv.conf. Used when DNS is managed manually or by another service.
- systemd-resolved: Uses systemd-resolved to manage DNS.
- dnsmasq: Enables the internal dnsmasq plugin.
Solution
Configure NetworkManager in RHEL 9 to use a DNS mode.In "/etc/NetworkManager/NetworkManager.conf", add the following line in the "[main]" section:
dns = <dns processing mode>
Where <dns processing mode> is default, none, or systemd-resolved.
NetworkManager must be reloaded for the change to take effect.
$ sudo systemctl reload NetworkManager
See Also
https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_RHEL_9_V2R9_STIG.zip
Item Details
Audit Name: DISA Red Hat Enterprise Linux 9 STIG v2r9
Category: CONFIGURATION MANAGEMENT
References: 800-53|CM-6b., CAT|II, CCI|CCI-000366, Rule-ID|SV-257949r1134947_rule, STIG-ID|RHEL-09-252040, Vuln-ID|V-257949
Plugin: Unix
Control ID: 07a189bf35362330d8f650070037ab675b87871639b35db32ae5742cc9cd623a