Setting icmp_ignore_bogus_error_responses to 1 prevents the kernel from logging bogus responses (RFC-1122 non-compliant) from broadcast reframes, keeping file systems from filling up with useless log messages.
Rationale:
Some routers (and some attackers) will send responses that violate RFC-1122 and attempt to fill up a log file system with many useless error messages.
Fix:
Set the net.ipv4.icmp_ignore_bogus_error_responses parameter to 1 in /etc/sysctl.conf and run sysctl -p command:
net.ipv4.icmp_ignore_bogus_error_responses=1
Modify active kernel parameters to match:
# /sbin/sysctl -w net.ipv4.icmp_ignore_bogus_error_responses=1
# /sbin/sysctl -w net.ipv4.route.flush=1
[yes/no]
Set the net.ipv4.icmp_ignore_bogus_error_responses parameter to 1 in /etc/sysctl.conf:
net.ipv4.icmp_ignore_bogus_error_responses=1
Modify active kernel parameters to match:
# /sbin/sysctl -w net.ipv4.icmp_ignore_bogus_error_responses=1
# /sbin/sysctl -w net.ipv4.route.flush=1
oval:org.secpod.oval:def:92374
oval:org.secpod.oval:def:66003
oval:org.secpod.oval:def:87330
oval:org.secpod.oval:def:85085
SCAP Repo OVAL Definition
2023-08-23