Would the switch described below be suitable?

http://edmonton.en.craigslist.ca/sys/831318465.html

Also,

your last post confirmed the my original question. that holding the option key down when clicking "built in ethernet" would generate the MAC address.

"This is no wonder and not Your fault. Within this context "router" does not stand for Your physically connected Airport Extreme router but for a dedicated (mostly software driven) "AppleTalk router" which provides "AppleTalk zones"."

An Appletalk router... Could my soon to be up and running ethernet ready Performa (LC) 475 act as that router?

K