Thank you ppalias for all the help you have given me and everyone else on this forum!
I wasn’t able to make the change suggested by you to stick: /root is actually RAM disk and disappears on reboot. And I did not see where on the “cdrom” (actually flash memory) partition this existed. I guess its a compressed file that is expanded into the RAM disk…
But I was able to use the UI (in the “Setup”->”Startup/Cron” page) to create a “post boot” script that seems to do the trick for me:
# Startup Script
ifconfig ETH01 down
ifconfig ETH01 hw ether 00:09:A3:00:2F:52
ifconfig ETH01 up