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 multicast Designated Router (DR) must be configured to filter the Internet Group Management Protocol (IGMP) and Multicast Listener Discovery (MLD) Report messages to allow hosts to join a multicast group only from sources that have been approved by the organization.

DISA Rule

SV-283863r1203838_rule

Vulnerability Number

V-283863

Group Title

SRG-NET-000364-RTR-000115

Rule Version

NOKI-RT-000450

Severity

CAT II

CCI(s)

• CCI-002403 - Only allow incoming communications from organization-defined authorized sources routed to organization-defined authorized destinations.

Weight

10

Fix Recommendation

Configure the DR to filter the IGMP and MLD report messages to allow hosts to join only multicast groups from sources that have been approved, as shown in the example below:

Create Prefix-List IPv4 Multicast Source:

- configure router policy-options
- config>router>policy-options# begin
- config>router>policy-options# prefix-list Multicast-Source-IPv4
- config>router>policy-options>prefix-list$ prefix 172.200.200.2/32 exact
- config>router>policy-options>prefix-list$ exit

Create Prefix-List IPv6 Multicast Source:

- configure router policy-options
- config>router>policy-options# begin
- config>router>policy-options# prefix-list Multicast-Source-IPv6
- config>router>policy-options>prefix-list$ prefix 2001:acad:1234:200::2/128 exact
- config>router>policy-options>prefix-list$ exit

Create a policy statement for IGMP:

- config>router>policy-options# policy-statement IMPORT_IGMP_JOIN
- config>router>policy-options>policy-statement$ entry 10
- config>router>policy-options>policy-statement>entry# from prefix-list "Multicast-Source-IPv4"
- config>router>policy-options>policy-statement>entry$ action accept
- config>router>policy-options>policy-statement>entry>action$ exit
- config>router>policy-options>policy-statement>entry$ exit
- config>router>policy-options>policy-statement$ default-action drop
- config>router>policy-options>policy-statement>default-action$ exit
- config>router>policy-options>policy-statement$ exit
- config>router>policy-options# commit

Create a policy statement for MLD:

- config>router>policy-options# policy-statement IMPORT_MLD_JOIN
- config>router>policy-options>policy-statement$ entry 10
- config>router>policy-options>policy-statement>entry$ from prefix-list "Multicast-Source-IPv6"
- config>router>policy-options>policy-statement>entry$ action accept
- config>router>policy-options>policy-statement>entry>action$ exit
- config>router>policy-options>policy-statement>entry$ exit
- config>router>policy-options>policy-statement$ default-action drop
- config>router>policy-options>policy-statement>default-action$ exit
- config>router>policy-options>policy-statement$ exit
- config>router>policy-options# commit
- config>router>policy-options# exit all

Apply import policy to the IGMP and MLD interface:

- configure router igmp interface "TO-CE" import "IMPORT_IGMP_JOIN"
- configure router mld interface "TO-CE" import "IMPORT_MLD_JOIN"

Check Contents

Review the configuration of the DR to verify it is filtering IGMP and MLD report messages, allowing hosts to only join multicast groups from sources that have been approved.

Verify the import policy is applied on the IGMP and MLD interface using the command below:

- show router igmp interface "TO-CE" detail | match "Import-Policy"
Import-Policy : IMPORT_IGMP_JOIN Subnet Check : Enabled

- show router mld interface "TO-CE" detail | match "Import-Policy"
Import-Policy : IMPORT_IGMP_JOIN

If the DR is not filtering IGMP and MLD report messages, this is a finding.

Vulnerability Number

V-283863

Documentable

False

Rule Version

NOKI-RT-000450

Severity Override Guidance

Review the configuration of the DR to verify it is filtering IGMP and MLD report messages, allowing hosts to only join multicast groups from sources that have been approved.

Verify the import policy is applied on the IGMP and MLD interface using the command below:

- show router igmp interface "TO-CE" detail | match "Import-Policy"
Import-Policy : IMPORT_IGMP_JOIN Subnet Check : Enabled

- show router mld interface "TO-CE" detail | match "Import-Policy"
Import-Policy : IMPORT_IGMP_JOIN

If the DR is not filtering IGMP and MLD report messages, this is a finding.

Check Content Reference

M

Target Key

5746