VPC configuration started breaking. No changes made

[Tomperez98]

Description

I cannot enable_ipv6 in my VPC with the configuration I used to have.

module "my_private_vpc" {
  source = "terraform-aws-modules/vpc/aws"

  name = "private-vpc"
  cidr = "10.0.0.0/16"

  azs                                            = ["${local.az}a", "${local.az}b"]
  private_subnets                                = ["10.0.1.0/24", "10.0.2.0/24"]
  public_subnets                                 = ["10.0.101.0/24", "10.0.102.0/24"]

  enable_ipv6          = true
  enable_dns_hostnames = true
  enable_dns_support   = true

  enable_nat_gateway     = true
  single_nat_gateway     = true
  one_nat_gateway_per_az = false

}

I get

modifying EC2 Subnet (subnet-123) EnableDns64: InvalidParameterValue: Invalid value 'true' for enable-dns64. Cannot set enable-dns64 to true unless the subnet (subnet-123) has an IPv6 CIDR block associated with it.

But this wasn't happening before.

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Versions

• Module version [Required]:

• Terraform version:

  
  Terraform v1.4.5
  on darwin_arm64

• provider registry.terraform.io/hashicorp/aws v4.64.0

Your version of Terraform is out of date! The latest version is 1.4.6. You can update by downloading from https://www.terraform.io/downloads.html

## Reproduction Code [Required]

```hcl
module "my_private_vpc" {
  source = "terraform-aws-modules/vpc/aws"

  name = "private-vpc"
  cidr = "10.0.0.0/16"

  azs                                            = ["${local.az}a", "${local.az}b"]
  private_subnets                                = ["10.0.1.0/24", "10.0.2.0/24"]
  public_subnets                                 = ["10.0.101.0/24", "10.0.102.0/24"]

  enable_ipv6          = true
  enable_dns_hostnames = true
  enable_dns_support   = true

  enable_nat_gateway     = true
  single_nat_gateway     = true
  one_nat_gateway_per_az = false

}

Steps to reproduce the behavior:

Expected behavior

To create the VPC as it was doing before

Actual behavior

Triggers and error

Terminal Output Screenshot(s)

Additional context

What am I missing

[bryantbiggs]

you should probably pin your version since v4 was released recently, or look at the changes made in v4 and align your code accordingly https://github.com/terraform-aws-modules/terraform-aws-vpc/blob/master/UPGRADE-4.0.md

[Tomperez98]

This solved this

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