rtl8029 in full-duplex?

Hi,

I have an rtl8029 interface on my macintosh g4, but I'm not sure it is set in full duplex. The card is connected to my speedtouch dsl modem. The interface in the speedtouch is configured to autonegotiate the link, but reports half-duplex. I've modprobe the ne2k-pci driver with full_duplex=1 but there is no changes. I cannot compile the ne2k-diag-tools on my g4 (headers problems).
How can I be sure the card is set in full-duplex?

Regards

Laurent