[CentOS] No eth0 on centos 6.2

Just installed centos 6.2.  I run and ifconfig -a I see and em1 
em2 and lo interface.  If I go to /etc/sysconfig/network-scripts, 
I don't see an ifcfg-eth0.  If I run ifup eth0 it comes back 
with "Device eth0 does not seem to be present, delaying 
initialization".  Anybody have a clue?  Thanks in advance.