No internet access with MSI K8N Neo2 Platinum.

I have tried everything I can think of to get internet access with Knoppix 3.7.

My motherboard is the MSI K8N Neo2 Platinum. It has 2 onboard LAN jacks -
- 1 LAN supports 10/100/1000 Fast Ethernet by Marvell 88E1111 PHY
- 1 LAN supports 10/100/1000 Fast Ethernet by Realtek 8110S (1000Mbps)

I have been running Fedora Core 3 for the past month or so with no issues. Windows works fine also. What do I need to do to get this thing running? Thanks for any help you can provide.