mediumnetworkverified ✓rollback-safe
Ensure broadcast icmp requests are ignored
sysctl-ignore-broadcast-icmp · RHEL ≥ 8 · 1 impl
Description
The kernel parameter(s) net.ipv4.icmp_echo_ignore_broadcasts must be configured to enforce this network security control.
Rationale
Improper network kernel parameters can allow network-based attacks including packet redirection, source routing, and denial of service.
Check → Remediate
Checksysctl_value
- key:
- net.ipv4.icmp_echo_ignore_broadcasts
- expected:
- 1
Remediatesysctl_set
- key:
- net.ipv4.icmp_echo_ignore_broadcasts
- value:
- 1
Framework references
CIS
rhel9 3.3.4rhel8 3.3.1.7rhel10 3.3.1.7
STIG
V-230537V-257966 / RHEL-09-253055V-281349 / RHEL-10-800170
NIST 800-53
SC-7CM-7SC-5
Live verification
rhel10:checkrhel8:checkrhel9:check
#sysctl#networking#hardening