Server Backup Restored but IP Changed - how to update ?

Server was restored from a backup and the IP of the server changed (new datacenter ip block)

What is the best process to change the Server IP and all sites?

you will make sure the ip configuration is correct from this location [/etc/sysconfig/network-scripts/]

Dashboard > Edit Settings [update the ip address]

go to this url to rebuild vhosts.
http://YOURIPADDRESS:2030/admin/index.php?module=vhost_rebuild