Hello Bob !
You can only use one of the connectors on your ethernet card at once, to
connect the main computer to two different nets you need to install a second
card, dito if you need the two media types. If the problem is that you have
one computer with BNC, one with both and one only with RJ45, and you want to
connect all three together, the easiest would be to get a cheap BNC-type card
somewhere and replace the card that has only RJ45 so you can wire all three of
them together with RG58 cable (the one with the BNC plugs).
Little off topic, but does anybody know what the BNC stands for ?
Jochen
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It's a jungle out there, so drink your Java.