There was also a slick little series of devices made by
Cayman called the
GatorBox. They would bridge pretty much any protocol (TCP/IP, Appletalk,
and even DECnet) over LocalTalk to Ethernet and back.
I don't know how easy they are to track down; I've got a GatorBox CS
Rack-mount that I was looking forward to playing with, unfortunately it
appears as if the previously owning institution (a local university) set a
password on it that I am not able to remove (apparently Cayman is no
longer assisting people with lockouts as they are in the DSL business
now, and seem rather uninterested in supporting their old product
line).
The Cayman makes the FastPath look plug and play, mostly as you notice the
support really stinks. OTOH I also have a couple Cayman boxes, and I
remember downloading all the files off the cayman ftp at some point. If you
can accept a big email attachment, email me directly and I will send it off
to you.
BTW the key item though is MacTCP encapsulation, which I don't know that
the Cayman does, and the FastPath I am sure of.