Nvidia nforce drivers for RH9
Did you have any luck?
Am also looking for a solution to the nvidia ethernet problem.
I found an old 3com ethernet card RH would recognize. This gives me access to the internet so I can at least download things to work on the problem. I see cards for $5 in the stores and catalogues if you can't beg borrow or steal one.
A good investment if it cuts down your frustration.
Another suggestion would be to dual boot with the Mandrake if that will give you internet access. Tho I tried dual booting with RH9 and Suse and the latter wiped out the RH boot. Was able to recover by reloading RH to all linux partitions.
Let me know what you end up with.