STIGQter STIGQter: STIG Summary: Tri-Lab Operating System Stack (TOSS) 5 Security Technical Implementation Guide Version: 1 Release: 1 Benchmark Date: 26 Mar 2026:

TOSS 5 systems using DNS resolution must have at least two name servers configured.

DISA Rule

SV-282678r1201587_rule

Vulnerability Number

V-282678

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

TOSS-05-000204

Severity

CAT II

CCI(s)

Weight

10

Fix Recommendation

Configure TOSS 5 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 the name servers used by the system using 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-282678

Documentable

False

Rule Version

TOSS-05-000204

Severity Override Guidance

Verify the name servers used by the system using 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.

Check Content Reference

M

Target Key

5738