STIGQter: STIG Summary: Tri-Lab Operating System Stack (TOSS) 4 Security Technical Implementation Guide Version: 2 Release: 6 Benchmark Date: 01 Jul 2026:

TOSS must not be performing packet forwarding unless the system is a router.

DISA Rule

SV-252941r991589_rule

Vulnerability Number

V-252941

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

TOSS-04-010390

Severity

CAT II

CCI(s)

CCI-000366 - Implement the security configuration settings.

Weight

Fix Recommendation

Configure TOSS to not allow packet forwarding, unless the system is a router with the following commands:

$ sudo sysctl -w net.ipv4.ip_forward=0

$ sudo sysctl -w net.ipv6.conf.all.forwarding=0

If "0" is not the system's default value then add or update the following lines in the appropriate file under "/etc/sysctl.d":

net.ipv4.ip_forward=0

net.ipv6.conf.all.forwarding=0

Check Contents

Verify TOSS is not performing packet forwarding unless the system is a router. If the system is a router (sometimes called a gateway) this requirement is Not Applicable.

Note: If either IPv4 or IPv6 is disabled on the system, this requirement only applies to the active internet protocol version.

Check to see if IP forwarding is enabled using the following commands:

$ sudo sysctl net.ipv4.ip_forward

net.ipv4.ip_forward = 0

$ sudo sysctl net.ipv6.conf.all.forwarding

net.ipv6.conf.all.forwarding = 0

If IP 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-252941

Documentable

False

Rule Version

TOSS-04-010390

Severity Override Guidance

Check Content Reference

Target Key

5469