3.3.3 Ensure IPv6 is disabled (Not Scored)
Profile Applicability
Level 1 - Server Level 1 - Workstation
Description
Although IPv6 has many advantages over IPv4, few organizations have implemented IPv6.
Rationale
If IPv6 is not to be used, it is recommended that it be disabled to reduce the attack surface of the system.
Audit
Run the following command and verify that each linux line has the ipv6.disable=1 parameter set:
# grep "^\s*linux" /boot/grub/grub.cfg
Remediation
Edit /etc/default/grub and add ipv6.disable=1 to GRUB_CMDLINE_LINUX:
GRUB_CMDLINE_LINUX="ipv6.disable=1"
Run the following command to update the grub2 configuration:
# update-grub