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


    v6host1 [ label="IPv6/TCP: [2001:db8::1]:2323"];
    v6host2 [ label="IPv6/TCP: [2001:db8::17]:4242"];

    v4host [ label="IPv4/TCP: 198.51.100.2:4323, 198.51.100.2:3345"];

    nat64gw [ label="NAT64 translator", rank=max ];

    v6host1--nat64gw;
    v6host2--nat64gw;

    nat64gw--v4host;
}