Love I.T., Live I.T., Embrace I.T.

Assuming you already have an ETH0 configured and working, log in at the console and configure it just like a normal RHEL/CentOS nic configuration:

1. cp /etc/sysconfig/network-scripts/ifcfg-eth0 /etc/sysconfig/network-scripts/ifcfg-eth1
2. vim /etc/sysconfig/network-scripts/ifcfg-eth1
   1. Update the ETH # to the next in line.  (ETH0 to ETH1…)
   2. Update the correct IP & Subnet
   3. :wq
3. service network restart
4. run ifconfig to ensure the settings have taken effect