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

OL 9 must not accept router advertisements on all IPv6 interfaces.

DISA Rule

SV-271877r1092343_rule

Vulnerability Number

V-271877

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

OL09-00-006040

Severity

CAT II

CCI(s)

Weight

10

Fix Recommendation

Configure OL 9 to not accept router advertisements on all IPv6 interfaces unless the system is a router.

Add or edit the following line in a single system configuration file in the "/etc/sysctl.d/" directory:

net.ipv6.conf.all.accept_ra = 0

Load settings from all system configuration files with the following command:

$ sudo sysctl --system

Check Contents

Note: If IPv6 is disabled on the system, this requirement is Not Applicable.

Verify that OL 9 does not accept router advertisements on all IPv6 interfaces, unless the system is a router.

Determine if router advertisements are not accepted by using the following command:

$ sysctl net.ipv6.conf.all.accept_ra
net.ipv6.conf.all.accept_ra = 0

If the "accept_ra" value is not "0" and is not documented with the information system security officer (ISSO) as an operational requirement, this is a finding.

Vulnerability Number

V-271877

Documentable

False

Rule Version

OL09-00-006040

Severity Override Guidance

Note: If IPv6 is disabled on the system, this requirement is Not Applicable.

Verify that OL 9 does not accept router advertisements on all IPv6 interfaces, unless the system is a router.

Determine if router advertisements are not accepted by using the following command:

$ sysctl net.ipv6.conf.all.accept_ra
net.ipv6.conf.all.accept_ra = 0

If the "accept_ra" value is not "0" and is not documented with the information system security officer (ISSO) as an operational requirement, this is a finding.

Check Content Reference

M

Target Key

5680