I want to set up IP/NAT so that both my iMac and NetBSD box can use 
my DSL router for accessing the Internet.  It is a Flowpoint 2200-12, 
which is a router rather than a bridge.  It has a 4 port Ethernet 
10BaseT hub built in.  Currently I am playing with a demo copy of 
IPNetRouter for  Mac OS which works fine, but is beta software, a 
little unstable and costs $89 for a full version.  As far as I can 
tell, NetBSD should be able to do the same thing.

I am using a Quadra 700 with the AAUI Ethernet and an adapter to 
convert it to 10BaseT cabling.  The iMac handles IP/NAT with a single 
Ethernet port and is able to deal with my low-demand two computer LAN 
just fine.  Can I do this on NetBSD with just the AAUI Ethernet, or 
would I have to add a second card?

I have found setup information for BetBSD 1.3 out there on the 
various mac68k sites; is this the same for 1.4.2 which I am currently 
using?

The setup would diagram like this:

NetBSD ------------------------------->
                                                          Enet 
hub/Router --------------> ISP gateway
  Mac OS ------------------------------>

This is the current setup, although  Mac OS is providing the IP/NAT 
rather than NetBSD.

Thanks for any input!