← Back to RUCKUS ICX Router Security Technical Implementation Guide

V-273631

CAT II (Medium)

The RUCKUS ICX router must be configured to have Internet Control Message Protocol (ICMP) unreachable notifications disabled on all external interfaces.

Rule ID

SV-273631r1110937_rule

STIG

RUCKUS ICX Router Security Technical Implementation Guide

Version

V1R1

CCIs

CCI-002385

Discussion

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. Host unreachable ICMP messages are commonly used by attackers for network mapping and diagnosis.

Check Content

Review the device configuration to determine if controls have been defined to ensure the router does not send ICMP unreachable notifications out to any external interfaces.

show run
verify "no ip icmp unreachable" is present

If ICMP unreachable notifications are enabled on any external interfaces, this is a finding.

Fix Text

Configure the ICX to not send ICMP unreachable messages.

conf t
no ip icmp unreachable
wr mem