I think the issue is that 2 new NICs are the exact same make/model, and may be trying to use the same IRQ or I/O address. IPCop's configuration finds the built in NIC at eth0, and 1 of the 2 new ones at eth1, but can't find the other one. I booted a PuppyLinux LiveCD and had the same experience. eth0 and eth1 are all it finds.
Puppy has a gnetconfig program which allowed me to look up the following information :
eth0 : IRQ 9, I/O 0xdf00
eth1 : IRQ 14, I/O 0x5000
The IPCop FAQs mention how to set up 2 NICs with separate IRQs and I/O.
I think this is the next thing to try, but I don't know how to determine what the correct values should be. I'd really appreciate some input from someone who might have a 'next step' for me to try. The tech support people at Airlink have been absolutely no help, but I wasn't expecting much given that I spent 0.99 each for these cards.
thanks,