digraph G {
    node [ shape="box"];

    # ORDER OF CREATION IS IMPORTANT FOR ORDERING!

    v6host [ label="2001:db8:42::42" ];
    nat64   [ label="NAT64 translator" ];
    v4host [ label="10.0.0.42" ];

    v6host->nat64 [ label="Connect to 2001:db8:42::10.0.0.42" ];
    nat64->v4host [ dir=back label="Connect to 10.0.0.66" ];
}