modules/vnet_gateway/main.tf

resource "azurerm_public_ip" "vnet_gateway_pip" {
  name                = "vnet-gateway-pip"
  location            = var.location
  resource_group_name = var.resource_group_name
  sku                 = "Standard"
  allocation_method   = "Static"
  ip_tags             = {}
  zones               = ["1", "2", "3"]
  tags                = var.tags
}

resource "azurerm_virtual_network_gateway" "vnet_gateway" {
  name                = "vnet-gateway"
  location            = var.location
  resource_group_name = var.resource_group_name
  type                = "Vpn"
  vpn_type            = "RouteBased"
  active_active       = false
  enable_bgp          = false
  sku                 = "VpnGw1AZ"
  tags                = var.tags

  ip_configuration {
    name                          = "vnetGatewayConfig"
    public_ip_address_id          = azurerm_public_ip.vnet_gateway_pip.id
    private_ip_address_allocation = "Dynamic"
    subnet_id                     = var.subnet_id
  }
}