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• You must be using Kubernetes 1.16 (alpha feature) or later (1.20 beta feature).
• Your cloud provider or underlying network must be able to provide Kubernetes nodes with routable IPv4 and IPv6 network interfaces.
• At least two nodes.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.
  
  Tip: IPv6 forwarding must be enabled (sysctl -w net.ipv6.conf.all.forwarding=1)address can be manually assigned to interface via adding in netplan configuration files (/etc/netplan/50-vagrant.yaml) IPv6 address to list of addresses and setting in interface section:

  accept-ra: no

  After that netplan apply needs to be called.

Options to add:

• kube-controller-manager
  • –-feature-gates="IPv6DualStack=true"
  • –-cluster-cidr=<IPv4 CIDR>,<IPv6 CIDR>
  • –-service-cluster-ip-range=<IPv4 CIDR>,<IPv6 CIDR>
• kubelet
  • –-feature-gates="IPv6DualStack=true"
• kube-proxy
  • –-proxy-mode=ipvs
  • –-cluster-cidrs=<IPv4 CIDR>,<IPv6 CIDR>
  • –-feature-gates="IPv6DualStack=true"