2001:2::[0000-ffff]:0002/64       198.19.0.0/15 - 198.19.255.254/15      
           \  +--------------------------------------+  /
  IPv6      \ |Initiator                    Responder| /
+-------------|                Tester                |<------------+
| addresses   |                         [state table]| public IPv4 |
|             +--------------------------------------+             |
|                                                                  |
|             +--------------------------------------+             |
| 2001:2::1/64|                 DUT:                 | public IPv4 |
+------------>|        Stateful NAT64 gateway        |-------------+
 IPv6 address |     [connection tracking table]      | \
              +--------------------------------------+  \
                                   198.18.0.1/15 - 198.18.255.255/15