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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 does not accept router advertisements on all IPv6 interfaces, unless the system is a router.
Determine if router advertisements are not accepted by using the following command:
$ sysctl net.ipv6.conf.all.accept_ra
net.ipv6.conf.all.accept_ra = 0
If the "accept_ra" value is not "0" and is not documented with the information system security officer (ISSO) as an operational requirement, this is a finding.
Configure OL 9 to not accept router advertisements on all IPv6 interfaces unless the system is a router.
Add or edit the following line in a single system configuration file in the "/etc/sysctl.d/" directory:
net.ipv6.conf.all.accept_ra = 0
Load settings from all system configuration files with the following command:
$ sudo sysctl --system