...
<Board><Device>[Number]_IF_Nbr
<Board> | Development board name |
<Device> | Network device name (or type) |
[Number] | Network device number for each specific instance of device (optional if the development board does not support multiple instances of the specific device) |
For example, the network device interface number variable for the #2 RS9110 wireless device on an Atmel AT91SAM9263-EK should be named AT91SAM9263-EK_RS9110_2_IF_Nbr .
...