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

    label="ungleich Dynamic IP access"

    client [ label="IPv6 client" ];
    vpnserver  [ label="ungleich Server" ];

    v6net [ label="IPv6 Internet" ];
    v4net [ label="IPv4 Internet" ];

    v4ip1 [ label="IPv4 address #1\nProvider 1" ]
    v4ip2 [ label="IPv4 address #2\nProvider 2" ]
    v4ipn [ label="IPv4 address #n\nProvider x" ]

    dnsserver [ label="ungleich DNS Server\nSource based DNS routing" ]

    client->vpnserver [ label="Establishes VPN" ]
    vpnserver->client [ label="Routes 2001:db8::/48 IPv6 network" ]

    vpnserver->{v4ip1, v4ip2, v4ipn} [ label="Outgoing connection" ]

    client->v4ip1 [ label="Access IPv4 Internet\nvia
    2001:db8:0:1:0:1::/96" style=dashed ]
    client->v4ip2 [ label="Access IPv4 Internet\nvia
    2001:db8:0:1:0:2::/96"  style=dashed ]
    client->v4ipn [ label="Access IPv4 Internet\nvia
    2001:db8:0:1:0:n::/96"  style=dashed ]
    {v4ip1, v4ip2, v4ipn}->v4net [ label="Specific IPv4 Source" ]

    client->v6net [ label="Source: 2001:db8:2::/64" style=dashed ]

    client->dnsserver [ label="(Optional) Request AAAA address"
    style=dotted ]
    dnsserver->client [ label="Source address based answer"
    style=dotted ]



}