DNS(Domain Name System) is the crucial part of any service provider. As we are moving towards IPv6 world, DNS role would be crucial to resolve the IP addresses to name.
The utmost challenge is when the host is IPv6 and would like to access IPv4 internet servers. In that case DNS64 will come into play and make some amendments after getting reply from IPv4 servers and sent its request with synthesized AAAA reply to host.(Scenario 3)
I have made three different scenarios as depicted below:-
1. NAT44 DNS Flow
2. IPv6 User Accessing IPv6 Internet (DNS Flow)
3. IPv6 User Accessing IPv4 Internet (DNS Flow)