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 | 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-22717r408800_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 |