The Nokia router must be configured to have Internet Control Message Protocol (ICMP) redirects disabled on all external interfaces.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-283851 | NOKI-RT-000330 | SV-283851r1203802_rule | CCI-002385 | medium |
| Description | ||||
| The ICMP supports IP traffic by relaying information about paths, routes, and network conditions. Routers automatically send ICMP messages under a wide variety of conditions. Redirect ICMP messages are commonly used by attackers for network mapping and diagnosis. | ||||
| STIG | Date | |||
| Nokia Service Router OS 25.x Router Security Technical Implementation Guide | 2026-06-15 | |||
Details
Check Text (C-283851r1203802_chk)
Review the device configuration to determine if controls have been defined to ensure the router does not send ICMP Redirect messages out to any external interfaces.
Use the command below to verify "Redirects " is set to "Disabled":
- show router interface "TO-PE1" detail | match "Redirects"
Redirects : Disabled
Redirects : Number - 100 Time (seconds) - 10
If ICMP Redirect messages are enabled on any external interfaces, this is a finding.
Fix Text (F-88321r1203801_fix)
Disable ICMP redirects on all external interfaces, as shown in the example below:
- configure router interface "TO-PE1" icmp no redirects