This question may have already been asked but how do you find the MAC address of your Drobo FS?
If you can SSH into it then maybe “ifconfig” would give it to you? I don’t have an FS any more so I can’t check. Also, most equipment with an Ethernet port has it on a sticker on the back or bottom. I think it’s also on the label on the box.
turn it upside down… its on the bottom 
safer yet, lift it and look at it in case you drop it
Wow I feel stupid, Thanks a lot it was right under the Drobo FS all this time.