For nearly all of my Oracle RAC Builds, I've used /etc/hosts and not DNS. As such I've not been able to take full advantage of GNS and SCANS.
Please note some of your experiences associated with the benefits of using DNS configuration for your Oracle 12c RAC Builds. I'm building my 12c RAC now and I'm starting to configure DNS so that I can provide my customers with better value/add of High Availability. I've used /etc/hosts in the past and one of my arguments in using /etc/hosts can be more secure because you only put in the /etc/hosts what you want the node to know. I also beleave that using /etc/hosts is a lot more simple and perhaps that could be a potential vulnerability. I've decided to start using DNS and to learn how to make it secure.
Your experiences are appreciated. Thanks in Advance!