If you have a telephone modemon base machine
you could use the AnalogX proxy or Autonet on third
machine with just nic, modem and floppy.
If you have DSL to the hub one can only access on
one machine at the time
you would need 2 Nics on the base machine
One to get the DSL the other one to send it to hub
and all other machines connectyed to the hub
+ a proxy or router on base machine analogX would
work and is free
I use floppyfw
http://www.zelow.no/floppyfw/index.html on a third machine
have a post on this in the networking section.