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Add IP Aliases in Red Hat Linux or CentOS Linux  
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If you have an IP for your server but you also want to add other IPs to the same server you must do the following:

Adding a network alias from command line in Red Hat or CentOS Linux
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From command line, using ifconfig command do: 
/sbin/ifconfig lo 127.0.0.1
/sbin/ifconfig eth0 up
/sbin/ifconfig eth0 10.0.0.1
/sbin/ifconfig eth0:0 192.168.0.1
/sbin/ifconfig eth0:1 192.168.0.2

Your network aliases would be eth0:0 and eth0:1


Configure a script to setup your network / IP aliases on boot in Red Hat Linux
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cd /etc/sysconfig/network-scripts/
cp ifcfg-eth0 ifcfg-eth0:0
cp ifcfg-eth0 ifcfg-eth0:1

Then edit ifcfg-eth0:0 and ifcfg-eth0:1 files and add your IP aliases there.

Also in Red Hat and CentOS Linux it is possible to add as IP aliases a range of IPs. To do that go to :
/etc/sysconfig/network-scripts/ directory and create a file ifcfg-eth0-range0 with the following content:

# -------- /etc/sysconfig/network-scripts/ifcfg-eth0-range0 file ------------
IPADDR_START=192.168.0.1
IPADDR_END=192.168.0.6
CLONENUM_START=0
NETMASK=255.255.255.248
 
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