STIGQter: STIG Summary: Nokia Service Router OS 25.x Router Security Technical Implementation Guide Version: 1 Release: 1 Benchmark Date: 28 Apr 2026:

The Nokia Provider Edge (PE) router must be configured with Unicast Reverse Path Forwarding (uRPF) loose mode enabled on all Customer Edge (CE)-facing interfaces.

DISA Rule

SV-283839r1203766_rule

Vulnerability Number

V-283839

Group Title

SRG-NET-000205-RTR-000008

Rule Version

NOKI-RT-000210

Severity

CAT II

CCI(s)

• CCI-001097 - Monitor and control communications at the external managed interfaces to the system and at key managed interfaces within the system.

Weight

10

Fix Recommendation

Enable uRPF "loose" mode on all CE-facing interfaces, as shown in the example below:

- configure router interface "TO-CE" urpf-check mode loose

Check Contents

Review the router configuration to determine if uRPF loose mode is enabled on all CE-facing interfaces, as shown in the example below.

Verify "uRPF Chk" is set to "enabled" and "uRPF Chk Mode" is set to "loose":

- show router interface "TO-CE" detail | match "uRPF Chk"

uRPF Chk : enabled uRPF Chk Mode : loose

If "uRPF Chk" is not enabled and "uRPF Chk Mode" is not set to "loose" on all CE-facing interfaces, this is a finding.

Vulnerability Number

V-283839

Documentable

False

Rule Version

NOKI-RT-000210

Severity Override Guidance

Review the router configuration to determine if uRPF loose mode is enabled on all CE-facing interfaces, as shown in the example below.

Verify "uRPF Chk" is set to "enabled" and "uRPF Chk Mode" is set to "loose":

- show router interface "TO-CE" detail | match "uRPF Chk"

uRPF Chk : enabled uRPF Chk Mode : loose

If "uRPF Chk" is not enabled and "uRPF Chk Mode" is not set to "loose" on all CE-facing interfaces, this is a finding.

Check Content Reference

M

Target Key

5746