The Cisco switch must be configured to have Internet Control Message Protocol (ICMP) redirect messages disabled on all external interfaces.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-221002 | CISC-RT-000190 | SV-221002r856407_rule | CCI-002385 | medium |
| Description | ||||
| The ICMP supports IP traffic by relaying information about paths, routes, and network conditions. Switches 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 | |||
| Cisco IOS XE Switch RTR Security Technical Implementation Guide | 2025-05-20 | |||
Details
Check Text (C-221002r856407_chk)
Review the switch configuration to verify that the no ip redirects command has been configured on all external interfaces as shown in the example below:
interface GigabitEthernet0/1
ip address x.x.x.x 255.255.255.0
no ip redirects
If ICMP Redirect messages are enabled on any external interfaces, this is a finding.
Fix Text (F-22706r408801_fix)
Disable ICMP redirects on all external interfaces as shown in the example below:
SW1(config)#int g0/1
SW1(config-if)#no ip redirects