0          0                  0                          1
 0          1                  6                          2 
 0          0                  4                          7 
+----------+------------------+----------------------------+
|1111111010|       zeros      |    Interface Identifier    |
+----------+------------------+----------------------------+
.                                                          .
. <- - - - - - - - - - - 128 bits - - - - - - - - - - - -> .
.                                                          .