I think while recompiling the kernel, there is an option 'Support for older 8139-based cards'.. or something liek that. I think you can use rtl8139 if that is enabled. I remember using that driver when I had Mandrake 7.x (ah! the good ol' days!!!)
In v. 2.4, the driver for recent RealTek chipset-based cards might have been replaced by 8139too.