+-----------+
              |10.0.0.0/8 |
+----------+  +-----------+ +----------+
|          +----+     +-----+ FW DC2   |
| FW DC1   |                | BACKUP   |
| PRIMARY  |                |          |
++----+----+                +-+-----+--+
 |    |                       |     |
 |    |                       |     |
 |    |                       |     |
 |    |       +---------+     |     |
 |    |       |INTERNET |     |     |
 |    |       |         |     |     |
 |    |       +-+---+---+     |     |
 |    |         |   |         |     |
 |    |         |   |         |     |
 |    |         |   |         |     |
 |    |     WAN1|   |WAN2     |     |
 |    |       +---------+     |     |
 |    +-------+  FW     +-----+     |
 |2 TUNNEL INT|  BRANCH |2 TUNNEL INT
 +------------+         +-----------+
              +---------+