You should not hook up 2 network adaptors to the same network. This creates routing loops between the adaptors and duplicate name on the network errors. If you want to use both adaptors, then you need to create 2 networks and route between them. I doubt that this would end up being a good idea though, unless the main workstations you were sending media files from, were also located on the 1000 network and didn't need to route. It really depends on how your network is designed, that is, which machines have to send what to whom. If you don't have too many machines, I'd bet you'd be better off just putting everything on the 1000 and leave it at that. There is no such thing as a "dominant connection".