Inappropriate value for attribute "route" - "ipv6_cidr_block" is required

[rossigee]

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Terraform Version

$ terraform -v
Terraform v0.12.24
+ provider.aws v2.67.0
+ provider.cloudflare v2.7.0
+ provider.dns v2.2.0
+ provider.kubernetes v1.11.3
+ provider.local v1.4.0
+ provider.null v2.1.2
+ provider.rancher2 v1.8.3
+ provider.random v2.2.1
+ provider.template v2.1.2
+ provider.vault v2.11.0

Affected Resource(s)

• aws_route_table

Terraform Configuration Files

resource "aws_route_table" "hmviart" {
  count = var.use_aws

  vpc_id = aws_vpc.hmviart[0].id

  route = [
    {
      cidr_block                = "0.0.0.0/0"
      egress_only_gateway_id    = ""
      gateway_id                = aws_internet_gateway.hmviart[0].id
      instance_id               = ""
      #ipv6_cidr_block           = ""
      nat_gateway_id            = ""
      network_interface_id      = ""
      transit_gateway_id        = ""
      vpc_peering_connection_id = ""
    },
  ]
}

Debug Output

With the 'ipv6_cidr_block' commented out...

Inappropriate value for attribute "route": element 0: attribute
"ipv6_cidr_block" is required.

Uncommented, with a blank string provided (which was working fine before I upgraded the provider)...

Error: expected "route.0.ipv6_cidr_block" to be a valid IPv4 Value, got : invalid CIDR address: 

  on modules/aws/network.tf line 45, in resource "aws_route_table" "hmviart":
  45: resource "aws_route_table" "hmviart" {

Expected Behavior

The ipv6_cidr_block attribute should be Optional as per docs...

https://www.terraform.io/docs/providers/aws/r/route_table.html#ipv6_cidr_block

Actual Behavior

As per message in Debug Output, not only is this attribute no longer optional, but it also appears to expect an IPV4 address for a field that you would expect to take an IPV6 subnet value.

Steps to Reproduce

1. terraform apply

[ewbankkit]

Related:

• aws_route.destination_cidr_block being evaluated in plan after 2.59.0 update - even if count evaluates to 0 #13003
• r/aws_route, r/aws_route_table, r/aws_default_route_table: Validate CIDR blocks #13778

[ewbankkit]

This was addressed via #13778, released in v2.68.0 of the AWS Provider.

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!