+----------+        +----------+
                    |          |        |          |
                    | extNAT64 +--------+   IPv4   |
                    |          |        |          |
                    +----+-----+        +----------+
                         |
                         |
+----------+        +----+-----+
|          |        |          |
|   IPv6   +--------+  DNS64   +
|          |        |          |
+----------+        +----------+