Is it possible to create a VPC without IPv6?

[mdimarino]

Looks like always IPv6 will be used.

Thanks!

[drewmullen]

Hi thanks for opening this issue. can you please share your config and the output from your plan

[mdimarino]

Here we have:
`module "vpc" {
source = "aws-ia/vpc/aws"
version = ">= 4.2.0"

name = "vpc-teste1"
cidr_block = "192.168.0.0/16"
az_count = 3
vpc_enable_dns_hostnames = true
vpc_enable_dns_support = true

vpc_assign_generated_ipv6_cidr_block = false
vpc_egress_only_internet_gateway = false

subnets = {
# Dual-stack subnet
public = {
# name_prefix = "my_public" # omit to prefix with "public"
netmask = 24
connect_to_igw = true # default
assign_ipv6_cidr = false
nat_gateway_configuration = "single_az" # options: "all_azs", "none"
}
# IPv4 only subnet
private = {
# omitting name_prefix defaults value to "private"
# name_prefix = "private_with_egress"
netmask = 24
assign_ipv6_cidr = false
connect_to_public_natgw = true
}
# IPv6-only subnet
# private_ipv6 = {
# ipv6_native = false
# assign_ipv6_cidr = false
# connect_to_eigw = false
# }
}

tags = {
Billing = "infrastructure"
}
}`

The plan ran fine:
`module.vpc.data.aws_availability_zones.current: Reading...
module.vpc.data.aws_availability_zones.current: Read complete after 0s [id=us-east-1]

Terraform used the selected providers to generate the following execution plan. Resource actions are indicated with the
following symbols:

• create

Terraform will perform the following actions:

module.vpc.aws_eip.nat["us-east-1a"] will be created

• resource "aws_eip" "nat" {
  • allocation_id = (known after apply)
  • association_id = (known after apply)
  • carrier_ip = (known after apply)
  • customer_owned_ip = (known after apply)
  • domain = (known after apply)
  • id = (known after apply)
  • instance = (known after apply)
  • network_border_group = (known after apply)
  • network_interface = (known after apply)
  • private_dns = (known after apply)
  • private_ip = (known after apply)
  • public_dns = (known after apply)
  • public_ip = (known after apply)
  • public_ipv4_pool = (known after apply)
  • tags = {
    • "Billing" = "infrastructure"
    • "Name" = "nat-public-us-east-1a"
      }
  • tags_all = {
    • "Billing" = "infrastructure"
    • "Name" = "nat-public-us-east-1a"
      }
  • vpc = true
    }

module.vpc.aws_internet_gateway.main[0] will be created

• resource "aws_internet_gateway" "main" {
  • arn = (known after apply)
  • id = (known after apply)
  • owner_id = (known after apply)
  • tags = {
    • "Billing" = "infrastructure"
    • "Name" = "vpc-teste1"
      }
  • tags_all = {
    • "Billing" = "infrastructure"
    • "Name" = "vpc-teste1"
      }
  • vpc_id = (known after apply)
    }

module.vpc.aws_nat_gateway.main["us-east-1a"] will be created

• resource "aws_nat_gateway" "main" {
  • allocation_id = (known after apply)
  • association_id = (known after apply)
  • connectivity_type = "public"
  • id = (known after apply)
  • network_interface_id = (known after apply)
  • private_ip = (known after apply)
  • public_ip = (known after apply)
  • secondary_private_ip_address_count = (known after apply)
  • secondary_private_ip_addresses = (known after apply)
  • subnet_id = (known after apply)
  • tags = {
    • "Billing" = "infrastructure"
    • "Name" = "nat-public-us-east-1a"
      }
  • tags_all = {
    • "Billing" = "infrastructure"
    • "Name" = "nat-public-us-east-1a"
      }
      }

module.vpc.aws_route.private_to_nat["private/us-east-1a"] will be created

• resource "aws_route" "private_to_nat" {
  • destination_cidr_block = "0.0.0.0/0"
  • id = (known after apply)
  • instance_id = (known after apply)
  • instance_owner_id = (known after apply)
  • nat_gateway_id = (known after apply)
  • network_interface_id = (known after apply)
  • origin = (known after apply)
  • route_table_id = (known after apply)
  • state = (known after apply)
    }

module.vpc.aws_route.private_to_nat["private/us-east-1b"] will be created

• resource "aws_route" "private_to_nat" {
  • destination_cidr_block = "0.0.0.0/0"
  • id = (known after apply)
  • instance_id = (known after apply)
  • instance_owner_id = (known after apply)
  • nat_gateway_id = (known after apply)
  • network_interface_id = (known after apply)
  • origin = (known after apply)
  • route_table_id = (known after apply)
  • state = (known after apply)
    }

module.vpc.aws_route.private_to_nat["private/us-east-1c"] will be created

• resource "aws_route" "private_to_nat" {
  • destination_cidr_block = "0.0.0.0/0"
  • id = (known after apply)
  • instance_id = (known after apply)
  • instance_owner_id = (known after apply)
  • nat_gateway_id = (known after apply)
  • network_interface_id = (known after apply)
  • origin = (known after apply)
  • route_table_id = (known after apply)
  • state = (known after apply)
    }

module.vpc.aws_route.public_ipv6_to_igw["us-east-1a"] will be created

• resource "aws_route" "public_ipv6_to_igw" {
  • destination_ipv6_cidr_block = "::/0"
  • gateway_id = (known after apply)
  • id = (known after apply)
  • instance_id = (known after apply)
  • instance_owner_id = (known after apply)
  • network_interface_id = (known after apply)
  • origin = (known after apply)
  • route_table_id = (known after apply)
  • state = (known after apply)
    }

module.vpc.aws_route.public_ipv6_to_igw["us-east-1b"] will be created

• resource "aws_route" "public_ipv6_to_igw" {
  • destination_ipv6_cidr_block = "::/0"
  • gateway_id = (known after apply)
  • id = (known after apply)
  • instance_id = (known after apply)
  • instance_owner_id = (known after apply)
  • network_interface_id = (known after apply)
  • origin = (known after apply)
  • route_table_id = (known after apply)
  • state = (known after apply)
    }

module.vpc.aws_route.public_ipv6_to_igw["us-east-1c"] will be created

• resource "aws_route" "public_ipv6_to_igw" {
  • destination_ipv6_cidr_block = "::/0"
  • gateway_id = (known after apply)
  • id = (known after apply)
  • instance_id = (known after apply)
  • instance_owner_id = (known after apply)
  • network_interface_id = (known after apply)
  • origin = (known after apply)
  • route_table_id = (known after apply)
  • state = (known after apply)
    }

module.vpc.aws_route.public_to_igw["us-east-1a"] will be created

• resource "aws_route" "public_to_igw" {
  • destination_cidr_block = "0.0.0.0/0"
  • gateway_id = (known after apply)
  • id = (known after apply)
  • instance_id = (known after apply)
  • instance_owner_id = (known after apply)
  • network_interface_id = (known after apply)
  • origin = (known after apply)
  • route_table_id = (known after apply)
  • state = (known after apply)
    }

module.vpc.aws_route.public_to_igw["us-east-1b"] will be created

• resource "aws_route" "public_to_igw" {
  • destination_cidr_block = "0.0.0.0/0"
  • gateway_id = (known after apply)
  • id = (known after apply)
  • instance_id = (known after apply)
  • instance_owner_id = (known after apply)
  • network_interface_id = (known after apply)
  • origin = (known after apply)
  • route_table_id = (known after apply)
  • state = (known after apply)
    }

module.vpc.aws_route.public_to_igw["us-east-1c"] will be created

• resource "aws_route" "public_to_igw" {
  • destination_cidr_block = "0.0.0.0/0"
  • gateway_id = (known after apply)
  • id = (known after apply)
  • instance_id = (known after apply)
  • instance_owner_id = (known after apply)
  • network_interface_id = (known after apply)
  • origin = (known after apply)
  • route_table_id = (known after apply)
  • state = (known after apply)
    }

module.vpc.aws_route_table.private["private/us-east-1a"] will be created

• resource "aws_route_table" "private" {
  • arn = (known after apply)
  • id = (known after apply)
  • owner_id = (known after apply)
  • propagating_vgws = (known after apply)
  • route = (known after apply)
  • tags = {
    • "Billing" = "infrastructure"
    • "Name" = "private-us-east-1a"
      }
  • tags_all = {
    • "Billing" = "infrastructure"
    • "Name" = "private-us-east-1a"
      }
  • vpc_id = (known after apply)
    }

module.vpc.aws_route_table.private["private/us-east-1b"] will be created

• resource "aws_route_table" "private" {
  • arn = (known after apply)
  • id = (known after apply)
  • owner_id = (known after apply)
  • propagating_vgws = (known after apply)
  • route = (known after apply)
  • tags = {
    • "Billing" = "infrastructure"
    • "Name" = "private-us-east-1b"
      }
  • tags_all = {
    • "Billing" = "infrastructure"
    • "Name" = "private-us-east-1b"
      }
  • vpc_id = (known after apply)
    }

module.vpc.aws_route_table.private["private/us-east-1c"] will be created

• resource "aws_route_table" "private" {
  • arn = (known after apply)
  • id = (known after apply)
  • owner_id = (known after apply)
  • propagating_vgws = (known after apply)
  • route = (known after apply)
  • tags = {
    • "Billing" = "infrastructure"
    • "Name" = "private-us-east-1c"
      }
  • tags_all = {
    • "Billing" = "infrastructure"
    • "Name" = "private-us-east-1c"
      }
  • vpc_id = (known after apply)
    }

module.vpc.aws_route_table.public["us-east-1a"] will be created

• resource "aws_route_table" "public" {
  • arn = (known after apply)
  • id = (known after apply)
  • owner_id = (known after apply)
  • propagating_vgws = (known after apply)
  • route = (known after apply)
  • tags = {
    • "Billing" = "infrastructure"
    • "Name" = "public-us-east-1a"
      }
  • tags_all = {
    • "Billing" = "infrastructure"
    • "Name" = "public-us-east-1a"
      }
  • vpc_id = (known after apply)
    }

module.vpc.aws_route_table.public["us-east-1b"] will be created

• resource "aws_route_table" "public" {
  • arn = (known after apply)
  • id = (known after apply)
  • owner_id = (known after apply)
  • propagating_vgws = (known after apply)
  • route = (known after apply)
  • tags = {
    • "Billing" = "infrastructure"
    • "Name" = "public-us-east-1b"
      }
  • tags_all = {
    • "Billing" = "infrastructure"
    • "Name" = "public-us-east-1b"
      }
  • vpc_id = (known after apply)
    }

module.vpc.aws_route_table.public["us-east-1c"] will be created

• resource "aws_route_table" "public" {
  • arn = (known after apply)
  • id = (known after apply)
  • owner_id = (known after apply)
  • propagating_vgws = (known after apply)
  • route = (known after apply)
  • tags = {
    • "Billing" = "infrastructure"
    • "Name" = "public-us-east-1c"
      }
  • tags_all = {
    • "Billing" = "infrastructure"
    • "Name" = "public-us-east-1c"
      }
  • vpc_id = (known after apply)
    }

module.vpc.aws_route_table_association.private["private/us-east-1a"] will be created

• resource "aws_route_table_association" "private" {
  • id = (known after apply)
  • route_table_id = (known after apply)
  • subnet_id = (known after apply)
    }

module.vpc.aws_route_table_association.private["private/us-east-1b"] will be created

• resource "aws_route_table_association" "private" {
  • id = (known after apply)
  • route_table_id = (known after apply)
  • subnet_id = (known after apply)
    }

module.vpc.aws_route_table_association.private["private/us-east-1c"] will be created

• resource "aws_route_table_association" "private" {
  • id = (known after apply)
  • route_table_id = (known after apply)
  • subnet_id = (known after apply)
    }

module.vpc.aws_route_table_association.public["us-east-1a"] will be created

• resource "aws_route_table_association" "public" {
  • id = (known after apply)
  • route_table_id = (known after apply)
  • subnet_id = (known after apply)
    }

module.vpc.aws_route_table_association.public["us-east-1b"] will be created

• resource "aws_route_table_association" "public" {
  • id = (known after apply)
  • route_table_id = (known after apply)
  • subnet_id = (known after apply)
    }

module.vpc.aws_route_table_association.public["us-east-1c"] will be created

• resource "aws_route_table_association" "public" {
  • id = (known after apply)
  • route_table_id = (known after apply)
  • subnet_id = (known after apply)
    }

module.vpc.aws_subnet.private["private/us-east-1a"] will be created

• resource "aws_subnet" "private" {
  • arn = (known after apply)
  • assign_ipv6_address_on_creation = false
  • availability_zone = "us-east-1a"
  • availability_zone_id = (known after apply)
  • cidr_block = "192.168.0.0/24"
  • enable_dns64 = false
  • enable_resource_name_dns_a_record_on_launch = false
  • enable_resource_name_dns_aaaa_record_on_launch = false
  • id = (known after apply)
  • ipv6_cidr_block = (known after apply)
  • ipv6_cidr_block_association_id = (known after apply)
  • ipv6_native = false
  • map_public_ip_on_launch = false
  • owner_id = (known after apply)
  • private_dns_hostname_type_on_launch = (known after apply)
  • tags = {
    • "Billing" = "infrastructure"
    • "Name" = "private-us-east-1a"
      }
  • tags_all = {
    • "Billing" = "infrastructure"
    • "Name" = "private-us-east-1a"
      }
  • vpc_id = (known after apply)
    }

module.vpc.aws_subnet.private["private/us-east-1b"] will be created

• resource "aws_subnet" "private" {
  • arn = (known after apply)
  • assign_ipv6_address_on_creation = false
  • availability_zone = "us-east-1b"
  • availability_zone_id = (known after apply)
  • cidr_block = "192.168.1.0/24"
  • enable_dns64 = false
  • enable_resource_name_dns_a_record_on_launch = false
  • enable_resource_name_dns_aaaa_record_on_launch = false
  • id = (known after apply)
  • ipv6_cidr_block = (known after apply)
  • ipv6_cidr_block_association_id = (known after apply)
  • ipv6_native = false
  • map_public_ip_on_launch = false
  • owner_id = (known after apply)
  • private_dns_hostname_type_on_launch = (known after apply)
  • tags = {
    • "Billing" = "infrastructure"
    • "Name" = "private-us-east-1b"
      }
  • tags_all = {
    • "Billing" = "infrastructure"
    • "Name" = "private-us-east-1b"
      }
  • vpc_id = (known after apply)
    }

module.vpc.aws_subnet.private["private/us-east-1c"] will be created

• resource "aws_subnet" "private" {
  • arn = (known after apply)
  • assign_ipv6_address_on_creation = false
  • availability_zone = "us-east-1c"
  • availability_zone_id = (known after apply)
  • cidr_block = "192.168.2.0/24"
  • enable_dns64 = false
  • enable_resource_name_dns_a_record_on_launch = false
  • enable_resource_name_dns_aaaa_record_on_launch = false
  • id = (known after apply)
  • ipv6_cidr_block = (known after apply)
  • ipv6_cidr_block_association_id = (known after apply)
  • ipv6_native = false
  • map_public_ip_on_launch = false
  • owner_id = (known after apply)
  • private_dns_hostname_type_on_launch = (known after apply)
  • tags = {
    • "Billing" = "infrastructure"
    • "Name" = "private-us-east-1c"
      }
  • tags_all = {
    • "Billing" = "infrastructure"
    • "Name" = "private-us-east-1c"
      }
  • vpc_id = (known after apply)
    }

module.vpc.aws_subnet.public["us-east-1a"] will be created

• resource "aws_subnet" "public" {
  • arn = (known after apply)
  • assign_ipv6_address_on_creation = true
  • availability_zone = "us-east-1a"
  • availability_zone_id = (known after apply)
  • cidr_block = "192.168.3.0/24"
  • enable_dns64 = false
  • enable_resource_name_dns_a_record_on_launch = false
  • enable_resource_name_dns_aaaa_record_on_launch = true
  • id = (known after apply)
  • ipv6_cidr_block = (known after apply)
  • ipv6_cidr_block_association_id = (known after apply)
  • ipv6_native = false
  • map_public_ip_on_launch = true
  • owner_id = (known after apply)
  • private_dns_hostname_type_on_launch = (known after apply)
  • tags = {
    • "Billing" = "infrastructure"
    • "Name" = "public-us-east-1a"
      }
  • tags_all = {
    • "Billing" = "infrastructure"
    • "Name" = "public-us-east-1a"
      }
  • vpc_id = (known after apply)
    }

module.vpc.aws_subnet.public["us-east-1b"] will be created

• resource "aws_subnet" "public" {
  • arn = (known after apply)
  • assign_ipv6_address_on_creation = true
  • availability_zone = "us-east-1b"
  • availability_zone_id = (known after apply)
  • cidr_block = "192.168.4.0/24"
  • enable_dns64 = false
  • enable_resource_name_dns_a_record_on_launch = false
  • enable_resource_name_dns_aaaa_record_on_launch = true
  • id = (known after apply)
  • ipv6_cidr_block = (known after apply)
  • ipv6_cidr_block_association_id = (known after apply)
  • ipv6_native = false
  • map_public_ip_on_launch = true
  • owner_id = (known after apply)
  • private_dns_hostname_type_on_launch = (known after apply)
  • tags = {
    • "Billing" = "infrastructure"
    • "Name" = "public-us-east-1b"
      }
  • tags_all = {
    • "Billing" = "infrastructure"
    • "Name" = "public-us-east-1b"
      }
  • vpc_id = (known after apply)
    }

module.vpc.aws_subnet.public["us-east-1c"] will be created

• resource "aws_subnet" "public" {
  • arn = (known after apply)
  • assign_ipv6_address_on_creation = true
  • availability_zone = "us-east-1c"
  • availability_zone_id = (known after apply)
  • cidr_block = "192.168.5.0/24"
  • enable_dns64 = false
  • enable_resource_name_dns_a_record_on_launch = false
  • enable_resource_name_dns_aaaa_record_on_launch = true
  • id = (known after apply)
  • ipv6_cidr_block = (known after apply)
  • ipv6_cidr_block_association_id = (known after apply)
  • ipv6_native = false
  • map_public_ip_on_launch = true
  • owner_id = (known after apply)
  • private_dns_hostname_type_on_launch = (known after apply)
  • tags = {
    • "Billing" = "infrastructure"
    • "Name" = "public-us-east-1c"
      }
  • tags_all = {
    • "Billing" = "infrastructure"
    • "Name" = "public-us-east-1c"
      }
  • vpc_id = (known after apply)
    }

module.vpc.aws_vpc.main[0] will be created

• resource "aws_vpc" "main" {
  • arn = (known after apply)
  • assign_generated_ipv6_cidr_block = false
  • cidr_block = "192.168.0.0/16"
  • default_network_acl_id = (known after apply)
  • default_route_table_id = (known after apply)
  • default_security_group_id = (known after apply)
  • dhcp_options_id = (known after apply)
  • enable_dns_hostnames = true
  • enable_dns_support = true
  • enable_network_address_usage_metrics = (known after apply)
  • id = (known after apply)
  • instance_tenancy = "default"
  • ipv6_association_id = (known after apply)
  • ipv6_cidr_block = (known after apply)
  • ipv6_cidr_block_network_border_group = (known after apply)
  • main_route_table_id = (known after apply)
  • owner_id = (known after apply)
  • tags = {
    • "Billing" = "infrastructure"
    • "Name" = "vpc-teste1"
      }
  • tags_all = {
    • "Billing" = "infrastructure"
    • "Name" = "vpc-teste1"
      }
      }

Plan: 31 to add, 0 to change, 0 to destroy.
╷
│ Warning: Argument is deprecated
│
│ with module.vpc.aws_eip.nat,
│ on .terraform/modules/vpc/main.tf line 99, in resource "aws_eip" "nat":
│ 99: vpc = true
│
│ use domain attribute instead
│
│ (and one more similar warning elsewhere)
╵

───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────

Note: You didn't use the -out option to save this plan, so Terraform can't guarantee to take exactly these actions if
you run "terraform apply" now.`

But apply has an function error:
module.vpc.aws_vpc.main[0]: Creating... module.vpc.aws_eip.nat["us-east-1a"]: Creating... module.vpc.aws_eip.nat["us-east-1a"]: Creation complete after 1s [id=eipalloc-0f6cef5cf98eaddbe] module.vpc.aws_vpc.main[0]: Still creating... [10s elapsed] module.vpc.aws_vpc.main[0]: Creation complete after 13s [id=vpc-0a7e85e01ae9cde31] module.vpc.aws_internet_gateway.main[0]: Creating... module.vpc.aws_route_table.public["us-east-1c"]: Creating... module.vpc.aws_route_table.private["private/us-east-1c"]: Creating... module.vpc.aws_route_table.public["us-east-1a"]: Creating... module.vpc.aws_route_table.public["us-east-1b"]: Creating... module.vpc.aws_route_table.private["private/us-east-1b"]: Creating... module.vpc.aws_route_table.private["private/us-east-1a"]: Creating... module.vpc.aws_internet_gateway.main[0]: Creation complete after 1s [id=igw-01aec2a9ceaa2a4fc] module.vpc.aws_route_table.public["us-east-1a"]: Creation complete after 1s [id=rtb-07d3c7685cd6100b4] module.vpc.aws_route_table.private["private/us-east-1c"]: Creation complete after 1s [id=rtb-01f60d1689d6756db] module.vpc.aws_route_table.public["us-east-1c"]: Creation complete after 1s [id=rtb-08361f47a7ed3064b] module.vpc.aws_route_table.public["us-east-1b"]: Creation complete after 1s [id=rtb-026728c3c6c904878] module.vpc.aws_route.public_ipv6_to_igw["us-east-1c"]: Creating... module.vpc.aws_route.public_to_igw["us-east-1c"]: Creating... module.vpc.aws_route.public_ipv6_to_igw["us-east-1a"]: Creating... module.vpc.aws_route.public_to_igw["us-east-1b"]: Creating... module.vpc.aws_route.public_ipv6_to_igw["us-east-1b"]: Creating... module.vpc.aws_route.public_to_igw["us-east-1a"]: Creating... module.vpc.aws_route_table.private["private/us-east-1a"]: Creation complete after 2s [id=rtb-0a06202e2f269c37e] module.vpc.aws_route_table.private["private/us-east-1b"]: Creation complete after 2s [id=rtb-01edd09a5db1a7dc0] module.vpc.aws_route.public_ipv6_to_igw["us-east-1a"]: Creation complete after 1s [id=r-rtb-07d3c7685cd6100b42750132062] module.vpc.aws_route.public_to_igw["us-east-1a"]: Creation complete after 1s [id=r-rtb-07d3c7685cd6100b41080289494] module.vpc.aws_route.public_ipv6_to_igw["us-east-1c"]: Creation complete after 1s [id=r-rtb-08361f47a7ed3064b2750132062] module.vpc.aws_route.public_to_igw["us-east-1c"]: Creation complete after 1s [id=r-rtb-08361f47a7ed3064b1080289494] module.vpc.aws_route.public_to_igw["us-east-1b"]: Creation complete after 1s [id=r-rtb-026728c3c6c9048781080289494] module.vpc.aws_route.public_ipv6_to_igw["us-east-1b"]: Creation complete after 2s [id=r-rtb-026728c3c6c9048782750132062] ╷ │ Warning: Argument is deprecated │ │ with module.vpc.aws_eip.nat, │ on .terraform/modules/vpc/main.tf line 99, in resource "aws_eip" "nat": │ 99: vpc = true │ │ use domain attribute instead │ │ (and 2 more similar warnings elsewhere) ╵ ╷ │ Error: Invalid index │ │ on .terraform/modules/vpc.calculate_subnets_ipv6.subnet_calculator/main.tf line 2, in locals: │ 2: cidr_netmask = tonumber(split("/", var.base_cidr_block)[1]) │ ├──────────────── │ │ var.base_cidr_block is "" │ │ The given key does not identify an element in this collection value: the given index is greater than or equal to the │ length of the collection.

[drewmullen]

Thank you for posting! i hate to be a bother... can you use triple back ticks?

looks like this

[mdimarino]

Sure! Thanks for help.

This is the config

module "vpc" {
  source  = "aws-ia/vpc/aws"
  version = ">= 4.2.0"

  name                     = "vpc-teste1"
  cidr_block               = "192.168.0.0/16"
  az_count                 = 3
  vpc_enable_dns_hostnames = true
  vpc_enable_dns_support   = true

  vpc_assign_generated_ipv6_cidr_block = false
  vpc_egress_only_internet_gateway     = false

  subnets = {
    # Dual-stack subnet
    public = {
    #   name_prefix               = "my_public" # omit to prefix with "public"
      netmask                   = 24
      connect_to_igw            = true  # default
      assign_ipv6_cidr          = false
      nat_gateway_configuration = "single_az" # options: "all_azs", "none"
    }
    # IPv4 only subnet
    private = {
      # omitting name_prefix defaults value to "private"
      # name_prefix  = "private_with_egress"
      netmask                 = 24
      assign_ipv6_cidr        = false
      connect_to_public_natgw = true
    }
  }


  tags = {
    Billing = "infrastructure"
  }
}

This is execution output:

module.vpc.data.aws_availability_zones.current: Reading...
module.vpc.data.aws_availability_zones.current: Read complete after 1s [id=us-east-1]

Terraform used the selected providers to generate the following execution plan. Resource actions are indicated with the
following symbols:
  + create

Terraform will perform the following actions:

  # module.vpc.aws_eip.nat["us-east-1a"] will be created
  + resource "aws_eip" "nat" {
      + allocation_id        = (known after apply)
      + association_id       = (known after apply)
      + carrier_ip           = (known after apply)
      + customer_owned_ip    = (known after apply)
      + domain               = (known after apply)
      + id                   = (known after apply)
      + instance             = (known after apply)
      + network_border_group = (known after apply)
      + network_interface    = (known after apply)
      + private_dns          = (known after apply)
      + private_ip           = (known after apply)
      + public_dns           = (known after apply)
      + public_ip            = (known after apply)
      + public_ipv4_pool     = (known after apply)
      + tags                 = {
          + "Billing" = "infrastructure"
          + "Name"    = "nat-public-us-east-1a"
        }
      + tags_all             = {
          + "Billing" = "infrastructure"
          + "Name"    = "nat-public-us-east-1a"
        }
      + vpc                  = true
    }

  # module.vpc.aws_internet_gateway.main[0] will be created
  + resource "aws_internet_gateway" "main" {
      + arn      = (known after apply)
      + id       = (known after apply)
      + owner_id = (known after apply)
      + tags     = {
          + "Billing" = "infrastructure"
          + "Name"    = "vpc-teste1"
        }
      + tags_all = {
          + "Billing" = "infrastructure"
          + "Name"    = "vpc-teste1"
        }
      + vpc_id   = (known after apply)
    }

  # module.vpc.aws_nat_gateway.main["us-east-1a"] will be created
  + resource "aws_nat_gateway" "main" {
      + allocation_id                      = (known after apply)
      + association_id                     = (known after apply)
      + connectivity_type                  = "public"
      + id                                 = (known after apply)
      + network_interface_id               = (known after apply)
      + private_ip                         = (known after apply)
      + public_ip                          = (known after apply)
      + secondary_private_ip_address_count = (known after apply)
      + secondary_private_ip_addresses     = (known after apply)
      + subnet_id                          = (known after apply)
      + tags                               = {
          + "Billing" = "infrastructure"
          + "Name"    = "nat-public-us-east-1a"
        }
      + tags_all                           = {
          + "Billing" = "infrastructure"
          + "Name"    = "nat-public-us-east-1a"
        }
    }

  # module.vpc.aws_route.private_to_nat["private/us-east-1a"] will be created
  + resource "aws_route" "private_to_nat" {
      + destination_cidr_block = "0.0.0.0/0"
      + id                     = (known after apply)
      + instance_id            = (known after apply)
      + instance_owner_id      = (known after apply)
      + nat_gateway_id         = (known after apply)
      + network_interface_id   = (known after apply)
      + origin                 = (known after apply)
      + route_table_id         = (known after apply)
      + state                  = (known after apply)
    }

  # module.vpc.aws_route.private_to_nat["private/us-east-1b"] will be created
  + resource "aws_route" "private_to_nat" {
      + destination_cidr_block = "0.0.0.0/0"
      + id                     = (known after apply)
      + instance_id            = (known after apply)
      + instance_owner_id      = (known after apply)
      + nat_gateway_id         = (known after apply)
      + network_interface_id   = (known after apply)
      + origin                 = (known after apply)
      + route_table_id         = (known after apply)
      + state                  = (known after apply)
    }

  # module.vpc.aws_route.private_to_nat["private/us-east-1c"] will be created
  + resource "aws_route" "private_to_nat" {
      + destination_cidr_block = "0.0.0.0/0"
      + id                     = (known after apply)
      + instance_id            = (known after apply)
      + instance_owner_id      = (known after apply)
      + nat_gateway_id         = (known after apply)
      + network_interface_id   = (known after apply)
      + origin                 = (known after apply)
      + route_table_id         = (known after apply)
      + state                  = (known after apply)
    }

  # module.vpc.aws_route.public_ipv6_to_igw["us-east-1a"] will be created
  + resource "aws_route" "public_ipv6_to_igw" {
      + destination_ipv6_cidr_block = "::/0"
      + gateway_id                  = (known after apply)
      + id                          = (known after apply)
      + instance_id                 = (known after apply)
      + instance_owner_id           = (known after apply)
      + network_interface_id        = (known after apply)
      + origin                      = (known after apply)
      + route_table_id              = (known after apply)
      + state                       = (known after apply)
    }

  # module.vpc.aws_route.public_ipv6_to_igw["us-east-1b"] will be created
  + resource "aws_route" "public_ipv6_to_igw" {
      + destination_ipv6_cidr_block = "::/0"
      + gateway_id                  = (known after apply)
      + id                          = (known after apply)
      + instance_id                 = (known after apply)
      + instance_owner_id           = (known after apply)
      + network_interface_id        = (known after apply)
      + origin                      = (known after apply)
      + route_table_id              = (known after apply)
      + state                       = (known after apply)
    }

  # module.vpc.aws_route.public_ipv6_to_igw["us-east-1c"] will be created
  + resource "aws_route" "public_ipv6_to_igw" {
      + destination_ipv6_cidr_block = "::/0"
      + gateway_id                  = (known after apply)
      + id                          = (known after apply)
      + instance_id                 = (known after apply)
      + instance_owner_id           = (known after apply)
      + network_interface_id        = (known after apply)
      + origin                      = (known after apply)
      + route_table_id              = (known after apply)
      + state                       = (known after apply)
    }

  # module.vpc.aws_route.public_to_igw["us-east-1a"] will be created
  + resource "aws_route" "public_to_igw" {
      + destination_cidr_block = "0.0.0.0/0"
      + gateway_id             = (known after apply)
      + id                     = (known after apply)
      + instance_id            = (known after apply)
      + instance_owner_id      = (known after apply)
      + network_interface_id   = (known after apply)
      + origin                 = (known after apply)
      + route_table_id         = (known after apply)
      + state                  = (known after apply)
    }

  # module.vpc.aws_route.public_to_igw["us-east-1b"] will be created
  + resource "aws_route" "public_to_igw" {
      + destination_cidr_block = "0.0.0.0/0"
      + gateway_id             = (known after apply)
      + id                     = (known after apply)
      + instance_id            = (known after apply)
      + instance_owner_id      = (known after apply)
      + network_interface_id   = (known after apply)
      + origin                 = (known after apply)
      + route_table_id         = (known after apply)
      + state                  = (known after apply)
    }

  # module.vpc.aws_route.public_to_igw["us-east-1c"] will be created
  + resource "aws_route" "public_to_igw" {
      + destination_cidr_block = "0.0.0.0/0"
      + gateway_id             = (known after apply)
      + id                     = (known after apply)
      + instance_id            = (known after apply)
      + instance_owner_id      = (known after apply)
      + network_interface_id   = (known after apply)
      + origin                 = (known after apply)
      + route_table_id         = (known after apply)
      + state                  = (known after apply)
    }

  # module.vpc.aws_route_table.private["private/us-east-1a"] will be created
  + resource "aws_route_table" "private" {
      + arn              = (known after apply)
      + id               = (known after apply)
      + owner_id         = (known after apply)
      + propagating_vgws = (known after apply)
      + route            = (known after apply)
      + tags             = {
          + "Billing" = "infrastructure"
          + "Name"    = "private-us-east-1a"
        }
      + tags_all         = {
          + "Billing" = "infrastructure"
          + "Name"    = "private-us-east-1a"
        }
      + vpc_id           = (known after apply)
    }

  # module.vpc.aws_route_table.private["private/us-east-1b"] will be created
  + resource "aws_route_table" "private" {
      + arn              = (known after apply)
      + id               = (known after apply)
      + owner_id         = (known after apply)
      + propagating_vgws = (known after apply)
      + route            = (known after apply)
      + tags             = {
          + "Billing" = "infrastructure"
          + "Name"    = "private-us-east-1b"
        }
      + tags_all         = {
          + "Billing" = "infrastructure"
          + "Name"    = "private-us-east-1b"
        }
      + vpc_id           = (known after apply)
    }

  # module.vpc.aws_route_table.private["private/us-east-1c"] will be created
  + resource "aws_route_table" "private" {
      + arn              = (known after apply)
      + id               = (known after apply)
      + owner_id         = (known after apply)
      + propagating_vgws = (known after apply)
      + route            = (known after apply)
      + tags             = {
          + "Billing" = "infrastructure"
          + "Name"    = "private-us-east-1c"
        }
      + tags_all         = {
          + "Billing" = "infrastructure"
          + "Name"    = "private-us-east-1c"
        }
      + vpc_id           = (known after apply)
    }

  # module.vpc.aws_route_table.public["us-east-1a"] will be created
  + resource "aws_route_table" "public" {
      + arn              = (known after apply)
      + id               = (known after apply)
      + owner_id         = (known after apply)
      + propagating_vgws = (known after apply)
      + route            = (known after apply)
      + tags             = {
          + "Billing" = "infrastructure"
          + "Name"    = "public-us-east-1a"
        }
      + tags_all         = {
          + "Billing" = "infrastructure"
          + "Name"    = "public-us-east-1a"
        }
      + vpc_id           = (known after apply)
    }

  # module.vpc.aws_route_table.public["us-east-1b"] will be created
  + resource "aws_route_table" "public" {
      + arn              = (known after apply)
      + id               = (known after apply)
      + owner_id         = (known after apply)
      + propagating_vgws = (known after apply)
      + route            = (known after apply)
      + tags             = {
          + "Billing" = "infrastructure"
          + "Name"    = "public-us-east-1b"
        }
      + tags_all         = {
          + "Billing" = "infrastructure"
          + "Name"    = "public-us-east-1b"
        }
      + vpc_id           = (known after apply)
    }

  # module.vpc.aws_route_table.public["us-east-1c"] will be created
  + resource "aws_route_table" "public" {
      + arn              = (known after apply)
      + id               = (known after apply)
      + owner_id         = (known after apply)
      + propagating_vgws = (known after apply)
      + route            = (known after apply)
      + tags             = {
          + "Billing" = "infrastructure"
          + "Name"    = "public-us-east-1c"
        }
      + tags_all         = {
          + "Billing" = "infrastructure"
          + "Name"    = "public-us-east-1c"
        }
      + vpc_id           = (known after apply)
    }

  # module.vpc.aws_route_table_association.private["private/us-east-1a"] will be created
  + resource "aws_route_table_association" "private" {
      + id             = (known after apply)
      + route_table_id = (known after apply)
      + subnet_id      = (known after apply)
    }

  # module.vpc.aws_route_table_association.private["private/us-east-1b"] will be created
  + resource "aws_route_table_association" "private" {
      + id             = (known after apply)
      + route_table_id = (known after apply)
      + subnet_id      = (known after apply)
    }

  # module.vpc.aws_route_table_association.private["private/us-east-1c"] will be created
  + resource "aws_route_table_association" "private" {
      + id             = (known after apply)
      + route_table_id = (known after apply)
      + subnet_id      = (known after apply)
    }

  # module.vpc.aws_route_table_association.public["us-east-1a"] will be created
  + resource "aws_route_table_association" "public" {
      + id             = (known after apply)
      + route_table_id = (known after apply)
      + subnet_id      = (known after apply)
    }

  # module.vpc.aws_route_table_association.public["us-east-1b"] will be created
  + resource "aws_route_table_association" "public" {
      + id             = (known after apply)
      + route_table_id = (known after apply)
      + subnet_id      = (known after apply)
    }

  # module.vpc.aws_route_table_association.public["us-east-1c"] will be created
  + resource "aws_route_table_association" "public" {
      + id             = (known after apply)
      + route_table_id = (known after apply)
      + subnet_id      = (known after apply)
    }

  # module.vpc.aws_subnet.private["private/us-east-1a"] will be created
  + resource "aws_subnet" "private" {
      + arn                                            = (known after apply)
      + assign_ipv6_address_on_creation                = false
      + availability_zone                              = "us-east-1a"
      + availability_zone_id                           = (known after apply)
      + cidr_block                                     = "192.168.0.0/24"
      + enable_dns64                                   = false
      + enable_resource_name_dns_a_record_on_launch    = false
      + enable_resource_name_dns_aaaa_record_on_launch = false
      + id                                             = (known after apply)
      + ipv6_cidr_block                                = (known after apply)
      + ipv6_cidr_block_association_id                 = (known after apply)
      + ipv6_native                                    = false
      + map_public_ip_on_launch                        = false
      + owner_id                                       = (known after apply)
      + private_dns_hostname_type_on_launch            = (known after apply)
      + tags                                           = {
          + "Billing" = "infrastructure"
          + "Name"    = "private-us-east-1a"
        }
      + tags_all                                       = {
          + "Billing" = "infrastructure"
          + "Name"    = "private-us-east-1a"
        }
      + vpc_id                                         = (known after apply)
    }

  # module.vpc.aws_subnet.private["private/us-east-1b"] will be created
  + resource "aws_subnet" "private" {
      + arn                                            = (known after apply)
      + assign_ipv6_address_on_creation                = false
      + availability_zone                              = "us-east-1b"
      + availability_zone_id                           = (known after apply)
      + cidr_block                                     = "192.168.1.0/24"
      + enable_dns64                                   = false
      + enable_resource_name_dns_a_record_on_launch    = false
      + enable_resource_name_dns_aaaa_record_on_launch = false
      + id                                             = (known after apply)
      + ipv6_cidr_block                                = (known after apply)
      + ipv6_cidr_block_association_id                 = (known after apply)
      + ipv6_native                                    = false
      + map_public_ip_on_launch                        = false
      + owner_id                                       = (known after apply)
      + private_dns_hostname_type_on_launch            = (known after apply)
      + tags                                           = {
          + "Billing" = "infrastructure"
          + "Name"    = "private-us-east-1b"
        }
      + tags_all                                       = {
          + "Billing" = "infrastructure"
          + "Name"    = "private-us-east-1b"
        }
      + vpc_id                                         = (known after apply)
    }

  # module.vpc.aws_subnet.private["private/us-east-1c"] will be created
  + resource "aws_subnet" "private" {
      + arn                                            = (known after apply)
      + assign_ipv6_address_on_creation                = false
      + availability_zone                              = "us-east-1c"
      + availability_zone_id                           = (known after apply)
      + cidr_block                                     = "192.168.2.0/24"
      + enable_dns64                                   = false
      + enable_resource_name_dns_a_record_on_launch    = false
      + enable_resource_name_dns_aaaa_record_on_launch = false
      + id                                             = (known after apply)
      + ipv6_cidr_block                                = (known after apply)
      + ipv6_cidr_block_association_id                 = (known after apply)
      + ipv6_native                                    = false
      + map_public_ip_on_launch                        = false
      + owner_id                                       = (known after apply)
      + private_dns_hostname_type_on_launch            = (known after apply)
      + tags                                           = {
          + "Billing" = "infrastructure"
          + "Name"    = "private-us-east-1c"
        }
      + tags_all                                       = {
          + "Billing" = "infrastructure"
          + "Name"    = "private-us-east-1c"
        }
      + vpc_id                                         = (known after apply)
    }

  # module.vpc.aws_subnet.public["us-east-1a"] will be created
  + resource "aws_subnet" "public" {
      + arn                                            = (known after apply)
      + assign_ipv6_address_on_creation                = true
      + availability_zone                              = "us-east-1a"
      + availability_zone_id                           = (known after apply)
      + cidr_block                                     = "192.168.3.0/24"
      + enable_dns64                                   = false
      + enable_resource_name_dns_a_record_on_launch    = false
      + enable_resource_name_dns_aaaa_record_on_launch = true
      + id                                             = (known after apply)
      + ipv6_cidr_block                                = (known after apply)
      + ipv6_cidr_block_association_id                 = (known after apply)
      + ipv6_native                                    = false
      + map_public_ip_on_launch                        = true
      + owner_id                                       = (known after apply)
      + private_dns_hostname_type_on_launch            = (known after apply)
      + tags                                           = {
          + "Billing" = "infrastructure"
          + "Name"    = "public-us-east-1a"
        }
      + tags_all                                       = {
          + "Billing" = "infrastructure"
          + "Name"    = "public-us-east-1a"
        }
      + vpc_id                                         = (known after apply)
    }

  # module.vpc.aws_subnet.public["us-east-1b"] will be created
  + resource "aws_subnet" "public" {
      + arn                                            = (known after apply)
      + assign_ipv6_address_on_creation                = true
      + availability_zone                              = "us-east-1b"
      + availability_zone_id                           = (known after apply)
      + cidr_block                                     = "192.168.4.0/24"
      + enable_dns64                                   = false
      + enable_resource_name_dns_a_record_on_launch    = false
      + enable_resource_name_dns_aaaa_record_on_launch = true
      + id                                             = (known after apply)
      + ipv6_cidr_block                                = (known after apply)
      + ipv6_cidr_block_association_id                 = (known after apply)
      + ipv6_native                                    = false
      + map_public_ip_on_launch                        = true
      + owner_id                                       = (known after apply)
      + private_dns_hostname_type_on_launch            = (known after apply)
      + tags                                           = {
          + "Billing" = "infrastructure"
          + "Name"    = "public-us-east-1b"
        }
      + tags_all                                       = {
          + "Billing" = "infrastructure"
          + "Name"    = "public-us-east-1b"
        }
      + vpc_id                                         = (known after apply)
    }

  # module.vpc.aws_subnet.public["us-east-1c"] will be created
  + resource "aws_subnet" "public" {
      + arn                                            = (known after apply)
      + assign_ipv6_address_on_creation                = true
      + availability_zone                              = "us-east-1c"
      + availability_zone_id                           = (known after apply)
      + cidr_block                                     = "192.168.5.0/24"
      + enable_dns64                                   = false
      + enable_resource_name_dns_a_record_on_launch    = false
      + enable_resource_name_dns_aaaa_record_on_launch = true
      + id                                             = (known after apply)
      + ipv6_cidr_block                                = (known after apply)
      + ipv6_cidr_block_association_id                 = (known after apply)
      + ipv6_native                                    = false
      + map_public_ip_on_launch                        = true
      + owner_id                                       = (known after apply)
      + private_dns_hostname_type_on_launch            = (known after apply)
      + tags                                           = {
          + "Billing" = "infrastructure"
          + "Name"    = "public-us-east-1c"
        }
      + tags_all                                       = {
          + "Billing" = "infrastructure"
          + "Name"    = "public-us-east-1c"
        }
      + vpc_id                                         = (known after apply)
    }

  # module.vpc.aws_vpc.main[0] will be created
  + resource "aws_vpc" "main" {
      + arn                                  = (known after apply)
      + assign_generated_ipv6_cidr_block     = false
      + cidr_block                           = "192.168.0.0/16"
      + default_network_acl_id               = (known after apply)
      + default_route_table_id               = (known after apply)
      + default_security_group_id            = (known after apply)
      + dhcp_options_id                      = (known after apply)
      + enable_dns_hostnames                 = true
      + enable_dns_support                   = true
      + enable_network_address_usage_metrics = (known after apply)
      + id                                   = (known after apply)
      + instance_tenancy                     = "default"
      + ipv6_association_id                  = (known after apply)
      + ipv6_cidr_block                      = (known after apply)
      + ipv6_cidr_block_network_border_group = (known after apply)
      + main_route_table_id                  = (known after apply)
      + owner_id                             = (known after apply)
      + tags                                 = {
          + "Billing" = "infrastructure"
          + "Name"    = "vpc-teste1"
        }
      + tags_all                             = {
          + "Billing" = "infrastructure"
          + "Name"    = "vpc-teste1"
        }
    }

Plan: 31 to add, 0 to change, 0 to destroy.
module.vpc.aws_vpc.main[0]: Creating...
module.vpc.aws_eip.nat["us-east-1a"]: Creating...
module.vpc.aws_eip.nat["us-east-1a"]: Creation complete after 1s [id=eipalloc-0f6cef5cf98eaddbe]
module.vpc.aws_vpc.main[0]: Still creating... [10s elapsed]
module.vpc.aws_vpc.main[0]: Creation complete after 13s [id=vpc-0a7e85e01ae9cde31]
module.vpc.aws_internet_gateway.main[0]: Creating...
module.vpc.aws_route_table.public["us-east-1c"]: Creating...
module.vpc.aws_route_table.private["private/us-east-1c"]: Creating...
module.vpc.aws_route_table.public["us-east-1a"]: Creating...
module.vpc.aws_route_table.public["us-east-1b"]: Creating...
module.vpc.aws_route_table.private["private/us-east-1b"]: Creating...
module.vpc.aws_route_table.private["private/us-east-1a"]: Creating...
module.vpc.aws_internet_gateway.main[0]: Creation complete after 1s [id=igw-01aec2a9ceaa2a4fc]
module.vpc.aws_route_table.public["us-east-1a"]: Creation complete after 1s [id=rtb-07d3c7685cd6100b4]
module.vpc.aws_route_table.private["private/us-east-1c"]: Creation complete after 1s [id=rtb-01f60d1689d6756db]
module.vpc.aws_route_table.public["us-east-1c"]: Creation complete after 1s [id=rtb-08361f47a7ed3064b]
module.vpc.aws_route_table.public["us-east-1b"]: Creation complete after 1s [id=rtb-026728c3c6c904878]
module.vpc.aws_route.public_ipv6_to_igw["us-east-1c"]: Creating...
module.vpc.aws_route.public_to_igw["us-east-1c"]: Creating...
module.vpc.aws_route.public_ipv6_to_igw["us-east-1a"]: Creating...
module.vpc.aws_route.public_to_igw["us-east-1b"]: Creating...
module.vpc.aws_route.public_ipv6_to_igw["us-east-1b"]: Creating...
module.vpc.aws_route.public_to_igw["us-east-1a"]: Creating...
module.vpc.aws_route_table.private["private/us-east-1a"]: Creation complete after 2s [id=rtb-0a06202e2f269c37e]
module.vpc.aws_route_table.private["private/us-east-1b"]: Creation complete after 2s [id=rtb-01edd09a5db1a7dc0]
module.vpc.aws_route.public_ipv6_to_igw["us-east-1a"]: Creation complete after 1s [id=r-rtb-07d3c7685cd6100b42750132062]
module.vpc.aws_route.public_to_igw["us-east-1a"]: Creation complete after 1s [id=r-rtb-07d3c7685cd6100b41080289494]
module.vpc.aws_route.public_ipv6_to_igw["us-east-1c"]: Creation complete after 1s [id=r-rtb-08361f47a7ed3064b2750132062]
module.vpc.aws_route.public_to_igw["us-east-1c"]: Creation complete after 1s [id=r-rtb-08361f47a7ed3064b1080289494]
module.vpc.aws_route.public_to_igw["us-east-1b"]: Creation complete after 1s [id=r-rtb-026728c3c6c9048781080289494]
module.vpc.aws_route.public_ipv6_to_igw["us-east-1b"]: Creation complete after 2s [id=r-rtb-026728c3c6c9048782750132062]
╷
│ Warning: Argument is deprecated
│ 
│   with module.vpc.aws_eip.nat,
│   on .terraform/modules/vpc/main.tf line 99, in resource "aws_eip" "nat":
│   99:   vpc      = true
│ 
│ use domain attribute instead
│ 
│ (and 2 more similar warnings elsewhere)
╵
╷
│ Error: Invalid index
│ 
│   on .terraform/modules/vpc.calculate_subnets_ipv6.subnet_calculator/main.tf line 2, in locals:
│    2:   cidr_netmask = tonumber(split("/", var.base_cidr_block)[1])
│     ├────────────────
│     │ var.base_cidr_block is ""
│ 
│ The given key does not identify an element in this collection value: the given index is greater than or equal to the
│ length of the collection.

[drewmullen]

thank you! much easier to read :)

i believe these are unnecessary and may be causing the issue. Can you remove this parameter from your subnet definitions and try again pls?

[drewmullen]

also, by default the ipv6 param is null link. I wonder if that setting to false is causing an issue

module "vpc" {
  source  = "aws-ia/vpc/aws"
  version = ">= 4.3.0"

  name                     = "vpc-teste1"
  cidr_block               = "192.168.0.0/16"
  az_count                 = 3
  vpc_enable_dns_hostnames = true
  vpc_enable_dns_support   = true

  subnets = {
    # Dual-stack subnet
    public = {
    #   name_prefix               = "my_public" # omit to prefix with "public"
      netmask                   = 24
      connect_to_igw            = true  # default
      nat_gateway_configuration = "single_az" # options: "all_azs", "none"
    }
    # IPv4 only subnet
    private = {
      # omitting name_prefix defaults value to "private"
      # name_prefix  = "private_with_egress"
      netmask                 = 24
      connect_to_public_natgw = true
    }
  }

  tags = {
    Billing = "infrastructure"
  }
}

[mdimarino]

Perfect now!

Maybe because "false" is something to be evaluated in the conditional expression.

Thanks.

[drewmullen]

Can you confirm ... was it removing the assign_ipv6_cidr value from the subnet definition or removing these 2?

  vpc_assign_generated_ipv6_cidr_block = false
  vpc_egress_only_internet_gateway     = false

[mdimarino]

Removing from top:

vpc_assign_generated_ipv6_cidr_block = false
vpc_egress_only_internet_gateway     = false

and from inside public and private subnets:

assign_ipv6_cidr          = false

[drewmullen]

@pablo19sc I wonder if we can improve logic or variable validation to prevent this in the future. I think its low priority but if there is a quick win might be good...

[drewmullen]

Since this issue regards several variables var validation will not work. However, a precondition probably will