Add ipv6 naming diagram

ipv6-naming-with-proxy.dot

@@ -0,0 +1,37 @@
+digraph G {
+    node [ shape=box ]
+    rankdir=LR;
+
+    label="Hostnames for IPv6 only hosts"
+
+    serverv6  [ label="Server (IPv6 only)" ];
+    proxy  [ label="Proxy (IPv4+IPv6)" ];
+
+    http [ label="HTTP(s) for\nwww.example.com" ]
+    dns [ label="DNS for www.example.com" ]
+
+    dnsv6 [ label="v6.example.com" ]
+    dnsv6->serverv6 [ label="Only AAAA entry configured" ]
+
+    clientv4 [ label="IPv4 client" ];
+    clientv6 [ label="IPv6 client" ];
+    clientdual [ label="Dual Stack client" ];
+
+    dns->proxy [ label="A entry points to proxy" ]
+    dns->serverv6 [ label="AAAA entry points to the server directly" ]
+
+    {clientv4,clientv6,clientdual}->dns [ label="First perform a DNS lookup" ]
+
+    clientdual->{proxy,serverv6} [ label="Accesses either way" style=dashed ]
+
+
+    clientv4->proxy [ label="Accesses server via proxy" ]
+    clientv6->serverv6 [ label="Accesses server directly" ]
+
+    proxy->serverv6 [ label="Forwards HTTP/HTTPS requests" ]
+    serverv6->http [ label="Serves content for" ]
+
+    {clientv6,clientdual}->serverv6 [ label="Access via\nv6.example.com" ]
+
+
+}

ipv6-viwib.dot

@@ -4,7 +4,7 @@ digraph G {
     label="The VIWVIB in action"
     node [ shape=box ]
 
-#    rankdir=LR
+    rankdir=LR
 
 
     ipv6internet [ label="The IPv6 Internet" shape=oval ]