The Cisco switch must be configured to have Internet Control Message Protocol (ICMP) redirect messages disabled on all external interfaces.
An XCCDF Rule
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.
- ID
- SV-220435r856237_rule
- Version
- CISC-RT-000190
- Severity
- Medium
- References
- Updated
Remediation Templates
A Manual Procedure
Disable ICMP redirects on all external interfaces as shown in the example below:
SW1(config)#int g0/1
SW1(config-if)#no ip redirects