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The Red Hat Enterprise Linux 5 Security Technical Implementation Guide (V1 R18) has 571 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.
If the "dhclient" package is not installed, this is not applicable.
Verify the DHCP client is configured to not send dynamic DNS updates.
Procedure:
# grep do-forward-updates /etc/dhclient.conf
If the file is not present, does not contain this configuration, or has the setting set to "true", this is a finding.
Edit or add the "/etc/dhclient.conf" file and add or edit the "do-forward-updates" setting to false.
Procedure:
# echo "do-forward-updates false;" >> /etc/dhclient.conf