/etc/sysconfig/network-scripts
ifcfg-eth0 is your primary IP config.
Secondary addresses can be bound with files such as
\"ifcfg-eth0:0\" , \"ifcfg-eth0:1\"
In each of those files you can bind whole ranges like:
\"IPADDR=123.123.123.12-88\"
That would be in one particular file, such as ifcfg-eth0:0, for example, and would bind that entire range provided they are available routable through the gateway(s) configured on the machine.
peace as always
