digraph G {
    node [ shape=box ]

    label="IPv4 via IPv6 (NAT64/SIIT) by ungleich.ch pu"

    v4island [ label="IPv4 only network\n192.0.2.0/24" ]
    nat64 [ label="NAT64 translator" ]
    v6internet [ label="IPv6 Internet\n::/0" ]

    v6internet->v4island [ label="Allow access\nfrom the IPv6 Internet" style=dashed ]
    v6internet->nat64 [ label="Connects to\n2001:db8:cafe::/120" ]
    nat64->v4island [ label="Translates 2001:db8:cafe::/120 to\n192.0.2.0/24\nSquashes ::/0 to 192.0.2.1" ]
}