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