| Well I can't just give you the configs because there are several ways to do it. I suggest to just add another one and play with it. You are trying to figure out this linux thing you need to just take the bull by the horns.
When you add it it should show up as eth1. You can then go to /etc/sysconfig/network-scripts and edit that with private addresses.
Might be easier just to add the one node before the linux box.
Essentially if you add another nic to your linux box that first switch is not needed anymore you will have a public interface and a private of which you have now you are just doing it from a switch instead of with the linux box. Since you just want one node to be public just connect it to the first switch and you will be good to go.
make sense?
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Some people have told me they don't think a fat penguin really embodies the grace of Linux, which just tells me they have never seen a angry penguin charging at them in excess of 100mph. They'd be a lot more careful about what they say if they had.
-- Linus Torvalds
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Configs on the Second NIC???? 
Linear Mode
