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 perimeter router must be configured to restrict it from accepting outbound IP packets that contain an illegitimate address in the source address field via egress filter or by enabling Unicast Reverse Path Forwarding (uRPF).

DISA Rule

SV-283914r1203991_rule

Vulnerability Number

V-283914

Group Title

SRG-NET-000205-RTR-000014

Rule Version

NOKI-RT-001050

Severity

CAT I

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

This requirement is not applicable for the DODIN Backbone.

Configure the router to ensure that an egress filter or uRPF is configured to restrict the router from accepting any outbound IP packet that contains an external IP address in the source field.

Configure uRPF using the example below:

- configure router interface "TO-PE2" urpf-check mode loose

Check Contents

This requirement is not applicable for the DODIN Backbone.

Review the router configuration to verify uRPF or an egress filter has been configured on all internal interfaces to restrict the router from accepting outbound IP packets that contain an illegitimate address in the source address field.

Verify uRPF on all internal interfaces and verify the "uRPF Chk" field is set to "enabled" using the command below:

- show router interface "TO-PE2" detail | match "uRPF Chk"
uRPF Chk : enabled uRPF Chk Mode : loose
uRPF Chk Fail Pk*: 0 uRPF Fail Bytes : 0

If uRPF or an egress filter to restrict the router from accepting outbound IP packets that contain an illegitimate address in the source address field has not been configured on all internal interfaces, this is a finding.

Vulnerability Number

V-283914

Documentable

False

Rule Version

NOKI-RT-001050

Severity Override Guidance

This requirement is not applicable for the DODIN Backbone.

Review the router configuration to verify uRPF or an egress filter has been configured on all internal interfaces to restrict the router from accepting outbound IP packets that contain an illegitimate address in the source address field.

Verify uRPF on all internal interfaces and verify the "uRPF Chk" field is set to "enabled" using the command below:

- show router interface "TO-PE2" detail | match "uRPF Chk"
uRPF Chk : enabled uRPF Chk Mode : loose
uRPF Chk Fail Pk*: 0 uRPF Fail Bytes : 0

If uRPF or an egress filter to restrict the router from accepting outbound IP packets that contain an illegitimate address in the source address field has not been configured on all internal interfaces, this is a finding.

Check Content Reference

M

Target Key

5746