Many thanks for your help spanish_biker. I have some questions about some of the options JoKeR commented out in this rc-local file. There's one that looks particularly interesting for me, although I am not sure I understand what it means:
### another address add
# ip addr add 192.168.1.1/24 dev eth1
What does that represent? Could I choose to assign the WMU-6500FS box
another IP address, over and above the one assigned by the Airlive GUI? Kinda like a
second IP? What would that do, if un-commented?