STIGQter: STIG Summary: Oracle Linux 9 Security Technical Implementation Guide Version: 1 Release: 6 Benchmark Date: 01 Jul 2026:

OL 9 systems using Domain Name Servers (DNS) resolution must have at least two name servers configured.

DISA Rule

SV-271861r1092295_rule

Vulnerability Number

V-271861

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

OL09-00-006003

Severity

CAT II

CCI(s)

CCI-000366 - Implement the security configuration settings.

Weight

Fix Recommendation

Configure the operating system to use two or more name servers for DNS resolution based on the DNS mode of the system.

If the NetworkManager DNS mode is set to "none", then add the following lines to "/etc/resolv.conf":

nameserver [name server 1]
nameserver [name server 2]

Replace [name server 1] and [name server 2] with the IPs of two different DNS resolvers.

If the NetworkManager DNS mode is set to "default" then add two DNS servers to a NetworkManager connection. Using the following commands:

$ sudo nmcli connection modify [connection name] ipv4.dns [name server 1]
$ sudo nmcli connection modify [connection name] ipv4.dns [name server 2]

Replace [name server 1] and [name server 2] with the IPs of two different DNS resolvers. Replace [connection name] with a valid NetworkManager connection name on the system. Replace ipv4 with ipv6 if IPv6 DNS servers are used.

Check Contents

Verify that OL 9 configures name servers used by the system with the following command:

$ grep nameserver /etc/resolv.conf
nameserver 192.168.1.2
nameserver 192.168.1.3

If less than two lines are returned that are not commented out, this is a finding.

Vulnerability Number

V-271861

Documentable

False

Rule Version

OL09-00-006003

Severity Override Guidance

Check Content Reference

Target Key

5680