When I was trying to get my CC on line, I plugged my CC network card into my router. I got a solid green light. This was before I configured anything other then tell TCP/IP that I was using ethernet. This means that the network card in my CC and my modern router could see each other. I am using a router made by Linksys. It is model number WRT 1900ACS. It has 4 external WiFi antennas, 5 ethernet ports, 1 USB 2.0 port and one USB 3.0 port. I did worry that if I updated the BIOS in the router, it may not be able to see the network card in my CC. But that has never happened.
I am using the Farallon brand of network card. When I asked on this forum which network card folks suggested, this one was the clear winner. I think I paid around $20 to $25 for it, plus a driver disk. It was suppose to be NOS. It did look new to me and included a real floppy made by Farallon, not a copy of a Farallon disc made by a person.
I thought that networking would probably be easier for me if I moved to a more modern OS. So I upgraded to 7.6.1. I know that many folks can network a CC using older versions of OS 7.0 something.
Keep us updated.
mraroid