There are circumstances when extra IPs are allocated to a certain server but they still do not ping or react, and only the primary IP of the server pings. For Cpanel centered web servers you will discover them assigned at below weblink as well :
WHM >> IP Functions >> Show IP Address Usage
You can confirm the IPs on shell using below control to see if they are connected to the virtual network interfaces on not :
Now if you feel that additional IPs are not appearing , then you can make them available using below command :
service ipaliases start
For Cpanel based servers such additional IPs are listed at /etc/ips.
If you face error while adding or removing IP’s you may check our post on error to add edit or remove ips please contact your server administrator.