The Linux Home Networking site has all the Linux networking references you should ever need unless you are load balancing a dozen webservers… If you’ve forgotten how to add virtual IP addresses, just create a “/etc/sysconfig/network-scripts/ifcfg-eth0:0” file. Insert the following lines, of course changing your IP Address:
DEVICE=eth0:0 ONBOOT=yes BOOTPROTO=static IPADDR=192.168.1.99 NETMASK=255.255.255.0
Happy networking. Covered in depth in Chapter 3 : Linux Home Networking. Enjoy.