Cluster via Mac Pro second ethernet port?

I'm on an enterprise 10/100 LAN and want to link two Mac Pros together for a cluster. I don't want to use the Internet Ethernet-1 port because it's slow and IT will probably throw a fit if they figure out I'm transferring massive amounts of data over the network. Consequently, I'll try to get a 1000Mb router and make my own gigabit LAN linked into the building network, however, IT will throw a fit if someone is operating behind a firewall inside their precious network.
Anyway, until I get this router situation worked out, I would like to link the two machines via a single Ethernet cable, while still retaining my Internet connection on the other port. In my trials, this doesn't work. I appear only able to use the active Ethernet port w/ the LAN.
Any ideas here?
Also, any suggestions on a reasonable quality router would be bonus help.
Thanks
Message was edited by: flaminiom

I've tried this before a while ago. I had the LAN/cloud setup on port 1, and directly connected to another Mac on port 2 and no dice w/ manual network settings. IIRC, I couldn't even select it in Qmaster.
I guess, first, has anyone got this to work? I'll give it another shot, but it would be nice to know someone has got this working before I start banging my head again.

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