README.md

VLAN Attachment module

This module allows for the provisioning of HA VPN over Interconnect. Specifically, this module creates a VPN gateway, a configurable number of tunnels, and all the resources required to established IPSec and BGP with the peer routers.

The required pair of encrypted VLAN Attachments can be created leveraging the net-vlan-attachment module, as shown in the IoIC Blueprint.

Examples

Single region setup

resource "google_compute_router" "encrypted-interconnect-overlay-router" {
  name    = "encrypted-interconnect-overlay-router"
  project = "myproject"
  network = "mynet"
  region  = "europe-west8"
  bgp {
    asn               = 64514
    advertise_mode    = "CUSTOM"
    advertised_groups = ["ALL_SUBNETS"]
    advertised_ip_ranges {
      range = "10.255.255.0/24"
    }
    advertised_ip_ranges {
      range = "192.168.255.0/24"
    }
  }
}

resource "google_compute_external_vpn_gateway" "default" {
  name        = "peer-vpn-gateway"
  project     = "myproject"
  description = "Peer IPSec over Interconnect VPN gateway"
  interface {
    id         = 0
    ip_address = "10.0.0.1"
  }
  interface {
    id         = 1
    ip_address = "10.0.0.2"
  }
}

module "vpngw-a" {
  source     = "./fabric/modules/net-ipsec-over-interconnect"
  project_id = "myproject"
  network    = "mynet"
  region     = "europe-west8"
  name       = "vpngw-a"
  interconnect_attachments = {
    a = "attach-01"
    b = "attach-02"
  }
  peer_gateway_config = {
    create = false
    id     = google_compute_external_vpn_gateway.default.id
  }
  router_config = {
    create = false
    name   = google_compute_router.encrypted-interconnect-overlay-router.name
  }
  tunnels = {
    remote-0 = {
      bgp_peer = {
        address = "169.254.1.2"
        asn     = 64514
        # MD5 Authentication is optional
        md5_authentication_key = {
          name = "foo"
          key  = "bar"
        }
      }
      bgp_session_range     = "169.254.1.1/30"
      shared_secret         = "foobar"
      vpn_gateway_interface = 0
    }
    remote-1 = {
      bgp_peer = {
        address = "169.254.1.6"
        asn     = 64514
      }
      bgp_session_range     = "169.254.1.5/30"
      shared_secret         = "foobar"
      vpn_gateway_interface = 1
    }
    remote-2 = {
      bgp_peer = {
        address = "169.254.1.10"
        asn     = 64514
      }
      bgp_session_range     = "169.254.1.9/30"
      shared_secret         = "foobar"
      vpn_gateway_interface = 0
    }
    remote-3 = {
      bgp_peer = {
        address = "169.254.1.14"
        asn     = 64514
      }
      bgp_session_range     = "169.254.1.13/30"
      shared_secret         = "foobar"
      vpn_gateway_interface = 1
    }
  }
}
# tftest modules=1 resources=16

Variables

name	description	type	required	default
interconnect_attachments	VLAN attachments used by the VPN Gateway.	object({…})	✓
name	Common name to identify the VPN Gateway.	string	✓
network	The VPC name to which resources are associated to.	string	✓
peer_gateway_config	IP addresses for the external peer gateway.	object({…})	✓
project_id	The project id.	string	✓
region	GCP Region.	string	✓
router_config	Cloud Router configuration for the VPN. If you want to reuse an existing router, set create to false and use name to specify the desired router.	object({…})	✓
tunnels	VPN tunnel configurations.	map(object({…}))		{}

Outputs

name	description	sensitive
bgp_peers	BGP peer resources.
external_gateway	External VPN gateway resource.
id	Fully qualified VPN gateway id.
random_secret	Generated secret.
router	Router resource (only if auto-created).
router_name	Router name.
self_link	HA VPN gateway self link.
tunnels	VPN tunnel resources.