STIGQter 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 accept router advertisements on all IPv6 interfaces by default.

DISA Rule

SV-253120r991589_rule

Vulnerability Number

V-253120

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

TOSS-04-040790

Severity

CAT II

CCI(s)

Weight

10

Fix Recommendation

Configure TOSS to not accept router advertisements on all IPv6 interfaces by default unless the system is a router with the following commands:

$ sudo sysctl -w net.ipv6.conf.default.accept_ra=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.ipv6.conf.default.accept_ra=0

Check Contents

Verify TOSS does not accept router advertisements on all IPv6 interfaces by default, unless the system is a router.

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

Check to see if router advertisements are not accepted by default by using the following command:

$ sudo sysctl net.ipv6.conf.default.accept_ra

net.ipv6.conf.default.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-253120

Documentable

False

Rule Version

TOSS-04-040790

Severity Override Guidance

Verify TOSS does not accept router advertisements on all IPv6 interfaces by default, unless the system is a router.

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

Check to see if router advertisements are not accepted by default by using the following command:

$ sudo sysctl net.ipv6.conf.default.accept_ra

net.ipv6.conf.default.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

5469