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 must not enable Internet Protocol version 4 (IPv4) packet forwarding unless the system is a router.

DISA Rule

SV-282697r1201349_rule

Vulnerability Number

V-282697

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

TOSS-05-000225

Severity

CAT II

CCI(s)

• CCI-000366 - Implement the security configuration settings.

Weight

10

Fix Recommendation

Configure TOSS 5 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 using the following command:

$ sudo sysctl --system

Check Contents

Verify TOSS 5 is not performing IPv4 packet forwarding unless the system is a router using the following command:

$ sudo 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 is missing, this is a finding.

Vulnerability Number

V-282697

Documentable

False

Rule Version

TOSS-05-000225

Severity Override Guidance

Verify TOSS 5 is not performing IPv4 packet forwarding unless the system is a router using the following command:

$ sudo 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 is missing, this is a finding.

Check Content Reference

M

Target Key

5738