I'm not remastering but on my hard drive installed system, that driver shows up in these directories, and my onboard NIC works without insmoding.

/lib/modules/2.4.22-xfs/kernel/drivers/net
/new-disk/lib/modules/2.4.22-xfs/kernel/drivers/net/3c2000.o
/usr/src/Linux/3c2000/3c2000.o

As I recall I downloaded the driver from the NVIDIA website, followed the instructions in the readme, copied the 3c2000.o file to the kernel drivers directory and insmoded once.

Hope this helps.