I understand the PA101 is a USB adaptor. You could try to use the usbnet module, but I have not heard of any success with linux and this adaptor. It would be easiest to just use a standard pci ethernet adaptor. Here is a link to the HCL for Redhat.
http://hardware.redhat.com/
PS, you can get RTL 8139 adaptors cheap ($5 or $6), and I have had good luck with them and many distros of linux.