The Nokia Provider Edge (PE) router must be configured to block any traffic that is destined to Internet Protocol (IP) core infrastructure.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-283880 | NOKI-RT-000620 | SV-283880r1203889_rule | CCI-001097 | high |
| Description | ||||
| IP/Multi-Protocol Label Switching (MPLS) networks providing VPN and transit services must provide, at the least, the same level of protection against denial-of-service attacks and intrusions as layer 2 networks. Although the IP core network elements are hidden, security should never rely entirely on obscurity. IP addresses can be guessed. Core network elements must not be accessible from any external host. Protecting the core from any attack is vital for the integrity and privacy of customer traffic as well as the availability of transit services. A compromise of the IP core can result in an outage or, at a minimum, nonoptimized forwarding of customer traffic. Protecting the core from an outside attack also prevents attackers from using the core to attack any customer. Hence, it is imperative that all routers at the edge deny traffic destined to any address belonging to the IP core infrastructure. | ||||
| STIG | Date | |||
| Nokia Service Router OS 25.x Router Security Technical Implementation Guide | 2026-06-15 | |||
Details
Check Text (C-283880r1203889_chk)
Review the router configuration to verify an ingress ACL is applied to all customer edge-facing interfaces.
Verify the filter is applied using the command below:
- show router interface "TO-PE2" detail | match "Ingress Filter"
Egress Filter : none Ingress Filter : 10
If the PE router is not configured to block any traffic with a destination address assigned to the IP core infrastructure, this is a finding.
Fix Text (F-88350r1203888_fix)
Configure protection for the IP core to be implemented at the edges by blocking any traffic with a destination address assigned to the IP core infrastructure, as shown in the example below:
Create an IPv4 filter:
- configure filter ip-filter 10
- config>filter>ip-filter# entry 10 create
- config>filter>ip-filter>entry# match dst-ip 172.150.150.2/30
- config>filter>ip-filter>entry# action drop
- config>filter>ip-filter>entry# exit all
Apply the IPv4 filter on the interface:
- configure router interface "TO-PE2" ingress filter ip 10