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I don't believe this is possible via the AWS::EC2::EIP
resource type. You could create a custom resource (or a registry resource) to call the ModifyAddressAttribute API (e.g. via boto3) which could update the EIP configuration after it's created.
However, there's a requirement that the reverse DNS entry has a matching forward DNS, so you would also need to create a suitable DNS entry (either in Route53, or in your own DNS system which again would be via a custom resource) before CloudFormation creates/updates the reverse DNS. You can use the DependsOn
attribute if necessary for that.
Thanks for the response, I'll look into creating a custom resource. Longer term, is it possible to create a feature request for this functionality within Cloudformation itself?
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CloudFormation publish their roadmap here on GitHub: https://github.com/aws-cloudformation/cloudformation-coverage-roadmap/projects/1 so you can create/track feature requests there.