I don't know why you need routing, Dan, and the solution that Marc
gave might be the best one for you.
It's possible that the Network Bridge can do the job better. It
combines multiple physical networks into one logical network, allowing
all of the computers to be in one subnet. I've written a web page
with details:
Please post any reply as a follow-up message in the news group
for everyone to see. I'm sorry, but I don't answer questions
addressed directly to me in E-mail or news groups.