First, Login as root through ssh and change the current working directory to
/etc/sysconfig/network-scripts
cd /etc/sysconfig/network-scripts
Second, find what network adapter is currently been used in your server:
ls ifcfg-*
Third, In the above figure you can see ifcfg-eth0 ifcfg-lo ifcfg-venet0 are shown but one must be your working adapter. To find that out use the command below:
ifconfig
In above figure your can see your Ethernet eth0 is having your server main ip address. So we will configure using that.
Fourth, you have to make a clone of etho and name it as eth0:0 using the command below:
cp ifcfg-eth0 ifcfg-eth0:0
Fifth, edit ifcfg-eth0:0 and change DEVICE to eth0:0 and change IPADDR to new ip address you want to add. See the picture below:
Sixth, Now everything is done and you just need to take the ip address live using the command below:
ifup eth0:0
Just follow step fourth to sixth to add N numbers of ip's by adding n number of interface to your server.
If you hang somewhere feel free to contact our support.