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http://www.oclc.org/support/documentation/ezproxy/technote/2l.htm

These are the steps to add the second IP address to your existing network adapter under non-SUSE distributions of Linux.

1. Become root on your system, either by logging into that account or using the su command.
2. Change your current directory to the /etc/sysconfig/network-scripts directory with the command:

   
   cd /etc/sysconfig/network-scripts
   

3. Check for existing network adapters with the command:

    ls ifcfg-* 

   In most instances, you will see the files ifcfg-eth0 and ifcfg-lo.

4. Edit /etc/hosts and add a line for your new address and name such as:

   24.249.162.195 www.xyz.org

5. To create the new interface, you will copy ifcfg-eth0 to ifcfg-eth0:0 with the command:

   cp ifcfg-eth0 ifcfg-eth0:0 

   Next, edit icfg-eth0:0 and change the DEVICE line to be similar to:

   DEVICE=eth0:0 

   and change the IPADDR line to be similiar to:

   IPADDR=24.249.162.195 

6. To activate the new IP address, issue a command similar to:

   ./ifup eth0:0