digraph G {
    node [ shape=box ]
#    rankdir=LR;

    v6only [ label="IPv6 only VM\nIPv6 network (A)" ];
    dualvm [ label="Dual Stack VM\nIPv6 network (B)" ];
    dnsserver [ label="DNS server" ]
    nat64 [ label="NAT64 translator" ]
    v4onlysite [ label="IPv4 destination" ]

    v6only->dnsserver [ label="A1. Request AAAA entry for IPv4 only site" ]
    dnsserver->v6only [ label="A2. Returns fake AAAA entry for IPv4 only site" ]

    v6only->nat64 [ label="A3. Send request via IPv6" ]
    nat64->v4onlysite [ label="A4. Translate and send request via IPv4" ]

    dualvm->dnsserver [ label="B1. Request A entry for IPv4 only site" ]
    dnsserver->dualvm [ label="B2. Returns fake A entry for IPv4 only site" ]
    dualvm->v4onlysite [ label="B3. Connect via IPv4" ]

}