DNS64

DNS64 is a DNS service that returns AAAA records with these synthetic IPv6 addresses for IPv4-only destinations (with A but not AAAA records in the DNS). This lets IPv6-only clients use NAT64 gateways without any other configuration.

The benefit of using DNS64 is that, the IPv6 single-stack cluster cannot communicate to the whole internet as the 40% of the internet moved to IPv6 stack and it needs a middle man called NAT64 to do the translation. DNS64 can help to resolve the hostname to IPv6 IP and handover to NAT64.

The OpenShift Network Playground uses bind package for this. It listens on sno0 interface and use the network 192.168.126.0/24.

Directory	/opt/openshift-network-playground/dns64/
Service	dns64.service