We don’t plan to backport this feature, but if the demand is really high, we’ll consider it.
— rkBleater commented
+1, this should be implemented in 17.x.
IPv6 is not something of the future, it is actively being deployed. More and more access providers are providing their customers with IPv6 and bad actors will be using it as well.
Thank you for your input! We will consider this functionality for the upcoming releases if it becomes popular enough.
Everyone, please continue voting for this feature if you consider it important.