Yeah.. I've found out the second NIC on the MacPro isnt all too useful for most normal folks.
I'm far from normal and I still dont see much use for it. I tried the whole link aggregation thing, but it didnt want to work right(even with a switch that supports it).
Plugging both ports in is fun, but the computer will only use one of them for most of its dealings with the internet. About the only thing I've found it useful for so far was setting my VM's to use that link, and it keeps the traffic separate when I have a look at whats going over the network.
I've played with setting up a second internal network with that and a few other things.. but so far its been rather pointless.
Anyone have any good use for it? Other than a pretty status light to stare at?