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

OL 9 must not enable IPv4 packet forwarding unless the system is a router.

DISA Rule

SV-271872r1092328_rule

Vulnerability Number

V-271872

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

OL09-00-006028

Severity

CAT II

CCI(s)

• CCI-000366 - Implement the security configuration settings.

Weight

10

Fix Recommendation

Configure OL 9 to not allow IPv4 packet forwarding 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.ipv4.conf.all.forwarding = 0

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

$ sudo sysctl --system

Check Contents

Verify that OL 9 is not performing IPv4 packet forwarding, unless the system is a router.

Check that IPv4 forwarding is disabled using the following command:

$ sysctl net.ipv4.conf.all.forwarding
net.ipv4.conf.all.forwarding = 0

If the IPv4 forwarding 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-271872

Documentable

False

Rule Version

OL09-00-006028

Severity Override Guidance

Verify that OL 9 is not performing IPv4 packet forwarding, unless the system is a router.

Check that IPv4 forwarding is disabled using the following command:

$ sysctl net.ipv4.conf.all.forwarding
net.ipv4.conf.all.forwarding = 0

If the IPv4 forwarding 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