Assigning eth0 and eth1 to specific NICs

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From the K12LTSP mailing list (a proper re-write of this info should be done): 

I've got one other question. The box I'm working on has an on-board
Gigabit NIC and I added a 3Com 10/100 NIC. I would like for the on-board
nic to be eth0 and serve the terminals and the 3Com to be eth1 and
connect to our lan. But, when I installed the OS, it defaulted the other
way. Is there a fairly simple way to switch them?

In /etc/sysconfig/network-scripts/ you'll find ifcfg-eth0 and ifcfg-eth1. In each of those you can specify the MAC address of the card you want the script to control. The syntax is

HWADDR=00:08:54:4F:49:1D

Using the respective address for each card, add the above line to ifcfg-eth0 and ifcfg-eth1.

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