I am using a 501-2015 SCSI/10baseT combo ethernet card in my IPX
for that purpose. I have two spares that I picked up from a used
Sun dealer for $150 each. The first one I found on ebay. Not all
ethernet boards are supported by the release, so be careful what
you buy. I would be willing to sell one of my spares for what I
have in it...

--tom