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XCCDF
Guide to the Secure Configuration of Ubuntu 20.04
System Settings
Network Configuration and Firewalls
IPv6
Disable Support for IPv6 Unless Needed
Disable IPv6 Networking Support Automatic Loading
Disable IPv6 Networking Support Automatic Loading
An XCCDF Rule
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Disable IPv6 Networking Support Automatic Loading
Medium Severity
To prevent the IPv6 kernel module (
ipv6
) from binding to the IPv6 networking stack, add the following line to
/etc/modprobe.d/disabled.conf
(or another file in
/etc/modprobe.d
):
options ipv6 disable=1
This permits the IPv6 module to be loaded (and thus satisfy other modules that depend on it), while disabling support for the IPv6 protocol.