We work in a shared office space and we have 2 Mac Pro's. We have 2 internet sources, ours and the post production house too. The Mac Pro's are in 2 separate rooms. One room has an ethernet jack to our internet, the other room has a jack to the post production house's internet. So one mac pro is connected to our network, and the other is connected to theirs. We have another ethernet cable to connects to both mac pros, we wanted to share the 2 networks with both mac pro's via ethernet. so mac 1 with our network shares it with mac 2, and also connects to post prod network via the ethernet. is this possible? we have internet sharing turned on but its not working.