output "subnet_rtb_ids" {
  value       = azurerm_subnet_route_table_association.azsub_rtb_link[*].id
  description = "List of association ids of subnet and route table."
}
output "subnet_natgw_ids" {
  value       = azurerm_subnet_nat_gateway_association.azsub_natgw_link[*].id
  description = "List of association ids of subnet and nat gateway."
}