+------------------+ 
                   | I2NSF Controller |  
                   +------------------+               
           I2NSF NSF-Facing |
                  Interface |
       /--------------------+-------------------\
      /                                          \
     /                                            \
+--------+                                    +--------+
| nsf_h1 |===== IPsec_ESP_Transport_mode =====| nsf_h2 |
+--------+                                    +--------+
        :100        (2001:db8:123:/64)       :200