Hi,

Thanks for the question. Interesting question though.

What came in my mind is we can create some dynamic expression to check some condition. So we create some logic condition to check if there is an overlap in CIDR block.

But this have to be proven or PoC later for validity

For reference: https://learn.hashicorp.com/tutorials/terraform/expressions?in=terraform/configuration-language&utm_source=WEBSITE&utm_medium=WEB_IO&utm_offer=ARTICLE_PAGE&utm_content=DOCS