TOSS 5 must not enable Internet Protocol version 6 (IPv6) packet forwarding unless the system is a router.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-282701 | TOSS-05-000229 | SV-282701r1201355_rule | CCI-000366 | medium |
| Description | ||||
| IP forwarding permits the kernel to forward packets from one network interface to another. The ability to forward packets between two networks is only appropriate for systems acting as routers. | ||||
| STIG | Date | |||
| Tri-Lab Operating System Stack (TOSS) 5 Security Technical Implementation Guide | 2026-04-01 | |||
Details
Check Text (C-282701r1201355_chk)
Verify TOSS 5 is not performing IPv6 packet forwarding unless the system is a router.
Note: If IPv6 is disabled on the system, this requirement is not applicable.
Check that IPv6 forwarding is disabled using the following commands:
$ sudo sysctl net.ipv6.conf.all.forwarding
net.ipv6.conf.all.forwarding = 0
If the IPv6 forwarding value is not "0" and is not documented with the information system security officer (ISSO) as an operational requirement, this is a finding.
Fix Text (F-87167r1201354_fix)
Configure TOSS 5 to not allow IPv6 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.ipv6.conf.all.forwarding = 0
Load settings from all system configuration files using the following command:
$ sudo sysctl --system