Thank you for your response. I am using the on-board NIC for WAN.
The PCI Intel NIC is not the problem. I think the problem is related to a MAC address conflict now. The on-board NIC is referred to as eth0_rename. I looked that up and found some information about editing persistent net rules. From what I have read this is common when people change NIC cards in various flavors of Linux. I am a n00b with this Linux stuffs but I am trying to hack it right now.
The PCI card is reported by "lspci" as:
Intel 82557/8/9/0/1 Pro 100/S Desktop Adapter
The problem NIC is the on-board Marvell 88E8056
Does it matter that both of the adapters are on IRQ 17? I can only control 1-15 in the BIOS.
