You can go to /etc/sysconfig/network-scripts , edit and move  around ifcfg-ethX files

Gabe

From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On Behalf Of gene.poole@macys.com
Sent: Wednesday, April 14, 2010 10:59 AM
To: centos@centos.org
Subject: [CentOS] How Do I ...

All,

I've got a machine running CentOS 5.3 and this machine has got 2 - built-in 1 Gig NICs and a expansion card with 4 - 100 Meg NICs.  For whatever reason at install time, it made the expansion card eth0 through eth3 and the internal ports eth4 and eth5. And by default the 'machine' is known on the network by the eth0 NIC, so my throughput is limited to 100 Mb.  How can I force the internal NICs to be eth0 and eth1?

Thanks,
Gene Poole