10.0.0.2/16 - 10.0.255.254/16      198.19.0.0/15 - 198.19.255.254/15
           \  +--------------------------------------+  /
            \ |Initiator                    Responder| /
+-------------|                Tester                |<------------+
| private IPv4|                         [state table]| public IPv4 |
|             +--------------------------------------+             |
|                                                                  |
|             +--------------------------------------+             |
| 10.0.0.1/16 |                 DUT:                 | public IPv4 |
+------------>|        Stateful NAT44 gateway        |-------------+
  private IPv4|     [connection tracking table]      | \
              +--------------------------------------+  \
                                   198.18.0.1/15 - 198.18.255.255/15