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The Oracle Linux 9 Security Technical Implementation Guide (V1 R7) has 450 STIG checks. New to STIG checklists? Read What is a STIG checklist?, CKL vs CKLB, and STIG vs SCAP benchmark.
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New to STIG checklists? Read What is a STIG checklist? and CKL vs CKLB.
Note: If IPv6 is disabled on the system, this requirement is Not Applicable.
Verify that OL 9 ignores IPv6 ICMP redirect messages.
Check the value of the "accept_redirects" variables with the following command:
$ sysctl net.ipv6.conf.all.accept_redirects
net.ipv6.conf.all.accept_redirects = 0
If the returned line does not have a value of "0", a line is not returned, or the line is commented out, this is a finding.
Configure OL 9 to ignore IPv6 ICMP redirect messages.
Add or edit the following line in a single system configuration file in the "/etc/sysctl.d/" directory:
net.ipv6.conf.all.accept_redirects = 0
Load settings from all system configuration files with the following command:
$ sudo sysctl --system