How to bring up the Kubernetes dual stack support?

IPv6 and IPv6 forwarding must be enabled:

sysctl -w net.ipv6.conf.all.disable_ipv6=0
sysctl -w net.ipv6.conf.all.forwarding=1

All the nodes must have an IPv6 address and they should be able to reach others over an IPv6 connection:
Edit netplan configuration file (/etc/netplan/50-vagrant.yaml). Add IPv6 address to list of addresses and set in interface section:
```
accept-ra: no
```
After that netplan apply needs to be called.

Following parameters need to be added to kubeadm init command:

--pod-network-cidr=10.233.64.0/18,2001:db8:1234:5678:8:2::/64 \
--service-cidr=10.96.0.0/12,2001:db8:1234:5678:8:3::/108 \
--feature-gates=IPv6DualStack=true \
--apiserver-advertise-address=10.10.10.13

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