Dual Stack Solution?

[pashonic]

I have been trying to get this example to create a dual stack cluster that supports ipv4 and ipv6 via Virtual Box. I can't get the nodes to be allocated ipv6 and ipv4 address. I tried different kubeadm init parameter combinations:

https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/dual-stack-support/

I also tried playing with different Virtualbox network settings (bridge, host). You have any recommendations to get this example to work with dual stack?