A reboot is required to enable IPv6.
+autoconf
+
+ Specifies whether to enable IPv6 address autoconfiguration
+ on all interfaces. This might be used when one does not wish
+ for addresses to be automatically generated from prefixes
+ received in Router Advertisements.
+
+ The possible values and their effects are:
+
+ 0
+ IPv6 address autoconfiguration is disabled on all interfaces.
+
+ Only the IPv6 loopback address (::1) and link-local addresses
+ will be added to interfaces.
+
+ 1
+ IPv6 address autoconfiguration is enabled on all interfaces.
+
+ This is the default value.
+
+disable_ipv6
+
+ Specifies whether to disable IPv6 on all interfaces.
+ This might be used when no IPv6 addresses are desired.
+
+ The possible values and their effects are:
+
+ 0
+ IPv6 is enabled on all interfaces.
+
+ This is the default value.
+
+ 1
+ IPv6 is disabled on all interfaces.
+
+ No IPv6 addresses will be added to interfaces.
+