Ok, I see, but I'm unsympathetic.
I'll buy that PDS ethernet cards, Scsi/ethernet adapters and the appletalk/ethernet adapters are hard to find, so we need another solution, but how realistic is it to need to hook up an old-mac to a router in a house with no other computers?
Surely you can find an old laptop cheap with serial and ethernet; throw bsd/linux on it; hide it behind your desk; and call it an "old-mac-ethernet-adapter".
Shoot, even better, just go get some OpenWRT/FreeWRT compatible router for $50 or maybe less put pppd on it and it'll serve ppp to your mac *and* be a router for the other computers that I guess you don't have.
