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The system must ignore ICMPv4 bogus error responses.


Finding ID Version Rule ID IA Controls Severity
V-217922 RHEL-06-000093 SV-217922r505923_rule Low
Ignoring bogus ICMP error responses reduces log size, although some activity would not be logged.
Red Hat Enterprise Linux 6 Security Technical Implementation Guide 2020-09-03


Check Text ( C-19403r376781_chk )
The status of the "net.ipv4.icmp_ignore_bogus_error_responses" kernel parameter can be queried by running the following command:

$ sysctl net.ipv4.icmp_ignore_bogus_error_responses
net.ipv4.icmp_ignore_bogus_error_responses = 1

$ grep net.ipv4.icmp_ignore_bogus_error_responses /etc/sysctl.conf /etc/sysctl.d/*
net.ipv4.icmp_ignore_bogus_error_responses = 1

If "net.ipv4.icmp_ignore_bogus_error_responses" is not configured in the /etc/sysctl.conf file or in the /etc/sysctl.d/ directory, is commented out or does not have a value of "1", this is a finding.
Fix Text (F-19401r376782_fix)
To set the runtime status of the "net.ipv4.icmp_ignore_bogus_error_responses" kernel parameter, run the following command:

# sysctl -w net.ipv4.icmp_ignore_bogus_error_responses=1

Set the system to the required kernel parameter by adding the following line to "/etc/sysctl.conf" or a config file in the /etc/sysctl.d/ directory (or modify the line to have the required value):

net.ipv4.icmp_ignore_bogus_error_responses = 1

Issue the following command to make the changes take effect:

# sysctl --system