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This component provisions a Site-To-Site VPN with a target AWS VPC on one side of the tunnel. The other (customer) side can be any VPN gateway endpoint, e.g. a hardware device, other cloud VPN, etc.

AWS Site-to-Site VPN is a fully-managed service that creates a secure connection between your data center or branch office and your AWS resources using IP Security (IPSec) tunnels. When using Site-to-Site VPN, you can connect to both your Amazon Virtual Private Clouds (VPC) and AWS Transit Gateway, and two tunnels per connection are used for increased redundancy.

The component provisions the following resources:

Post-tunnel creation requirements

Once the site-to-site VPN resources are deployed, you need to send the VPN configuration from AWS side to the administrator of the remote side of the VPN connection. To do this:

  1. Determine the infrastructure that will be used for the remote side, specifically:
  1. Log into the target AWS account
  2. Go to the "VPC" console
  3. On the left navigation manu, go to Virtual Private Network > Site-to-Site VPN Connections
  4. Select the VPN connection that was created via this component
  5. On the top right, click the Download Configuration button
  6. Enter the information you obtained and click Download
  7. Send the configuration file to the administrator of the remote side of the tunnel

Usage

Stack Level: Regional

components:
  terraform:
    site-to-site-vpn:
      metadata:
        component: site-to-site-vpn
      vars:
        enabled: true
        name: "site-to-site-vpn"
        vpc_component_name: vpc
        customer_gateway_bgp_asn: 65000
        customer_gateway_ip_address: 20.200.30.0
        vpn_gateway_amazon_side_asn: 64512
        vpn_connection_static_routes_only: true
        vpn_connection_tunnel1_inside_cidr: 169.254.20.0/30
        vpn_connection_tunnel2_inside_cidr: 169.254.21.0/30
        vpn_connection_local_ipv4_network_cidr: 10.100.128.0/24
        vpn_connection_remote_ipv4_network_cidr: 10.10.80.0/24
        vpn_connection_static_routes_destinations:
          - 10.100.128.0/24
        vpn_connection_tunnel1_startup_action: add
        vpn_connection_tunnel2_startup_action: add
        transit_gateway_enabled: false
        vpn_connection_tunnel1_cloudwatch_log_enabled: false
        vpn_connection_tunnel2_cloudwatch_log_enabled: false
        preshared_key_enabled: true
        ssm_enabled: true
        ssm_path_prefix: "/site-to-site-vpn"

Amazon side Autonomous System Number (ASN)

The variable vpn_gateway_amazon_side_asn (Amazon side Autonomous System Number) is not strictly required when creating an AWS VPN Gateway. If you do not specify Amazon side ASN during the creation of the VPN Gateway, AWS will automatically assign a default ASN (which is 7224 for the Amazon side of the VPN).

However, specifying Amazon side ASN can be important if you need to integrate the VPN with an on-premises network that uses Border Gateway Protocol (BGP) and you want to avoid ASN conflicts or require a specific ASN for routing policies.

If your use case involves BGP peering, and you need a specific ASN for the Amazon side, then you should explicitly set the vpn_gateway_amazon_side_asn. Otherwise, it can be omitted (set to null), and AWS will handle it automatically.

Provisioning

Provision the site-to-site-vpn component by executing the following commands:

atmos terraform plan site-to-site-vpn -s <stack>
atmos terraform apply site-to-site-vpn -s <stack>

References

<!-- prettier-ignore-start --> <!-- BEGINNING OF PRE-COMMIT-TERRAFORM DOCS HOOK -->

Requirements

NameVersion
<a name="requirement_terraform"></a> terraform>= 1.3.0
<a name="requirement_aws"></a> aws>= 4.0
<a name="requirement_random"></a> random>= 2.2

Providers

NameVersion
<a name="provider_aws"></a> aws>= 4.0
<a name="provider_random"></a> random>= 2.2

Modules

NameSourceVersion
<a name="module_iam_roles"></a> iam_roles../account-map/modules/iam-rolesn/a
<a name="module_this"></a> thiscloudposse/label/null0.25.0
<a name="module_vpc"></a> vpccloudposse/stack-config/yaml//modules/remote-state1.5.0
<a name="module_vpn_connection"></a> vpn_connectioncloudposse/vpn-connection/aws1.3.1

Resources

NameType
aws_ssm_parameter.tunnel1_preshared_keyresource
aws_ssm_parameter.tunnel2_preshared_keyresource
random_password.tunnel1_preshared_keyresource
random_password.tunnel2_preshared_keyresource

Inputs

NameDescriptionTypeDefaultRequired
<a name="input_additional_tag_map"></a> additional_tag_mapAdditional key-value pairs to add to each map in tags_as_list_of_maps. Not added to tags or id.<br/>This is for some rare cases where resources want additional configuration of tags<br/>and therefore take a list of maps with tag key, value, and additional configuration.map(string){}no
<a name="input_attributes"></a> attributesID element. Additional attributes (e.g. workers or cluster) to add to id,<br/>in the order they appear in the list. New attributes are appended to the<br/>end of the list. The elements of the list are joined by the delimiter<br/>and treated as a single ID element.list(string)[]no
<a name="input_context"></a> contextSingle object for setting entire context at once.<br/>See description of individual variables for details.<br/>Leave string and numeric variables as null to use default value.<br/>Individual variable settings (non-null) override settings in context object,<br/>except for attributes, tags, and additional_tag_map, which are merged.any<pre>{<br/> "additional_tag_map": {},<br/> "attributes": [],<br/> "delimiter": null,<br/> "descriptor_formats": {},<br/> "enabled": true,<br/> "environment": null,<br/> "id_length_limit": null,<br/> "label_key_case": null,<br/> "label_order": [],<br/> "label_value_case": null,<br/> "labels_as_tags": [<br/> "unset"<br/> ],<br/> "name": null,<br/> "namespace": null,<br/> "regex_replace_chars": null,<br/> "stage": null,<br/> "tags": {},<br/> "tenant": null<br/>}</pre>no
<a name="input_customer_gateway_bgp_asn"></a> customer_gateway_bgp_asnThe Customer Gateway's Border Gateway Protocol (BGP) Autonomous System Number (ASN)numbern/ayes
<a name="input_customer_gateway_ip_address"></a> customer_gateway_ip_addressThe IPv4 address for the Customer Gateway device's outside interface. Set to null to not create the Customer Gatewaystringnullno
<a name="input_delimiter"></a> delimiterDelimiter to be used between ID elements.<br/>Defaults to - (hyphen). Set to "" to use no delimiter at all.stringnullno
<a name="input_descriptor_formats"></a> descriptor_formatsDescribe additional descriptors to be output in the descriptors output map.<br/>Map of maps. Keys are names of descriptors. Values are maps of the form<br/>{<br/> format = string<br/> labels = list(string)<br/>}<br/>(Type is any so the map values can later be enhanced to provide additional options.)<br/>format is a Terraform format string to be passed to the format() function.<br/>labels is a list of labels, in order, to pass to format() function.<br/>Label values will be normalized before being passed to format() so they will be<br/>identical to how they appear in id.<br/>Default is {} (descriptors output will be empty).any{}no
<a name="input_enabled"></a> enabledSet to false to prevent the module from creating any resourcesboolnullno
<a name="input_environment"></a> environmentID element. Usually used for region e.g. 'uw2', 'us-west-2', OR role 'prod', 'staging', 'dev', 'UAT'stringnullno
<a name="input_existing_transit_gateway_id"></a> existing_transit_gateway_idExisting Transit Gateway ID. If provided, the module will not create a Virtual Private Gateway but instead will use the transit_gateway. For setting up transit gateway we can use the cloudposse/transit-gateway/aws module and pass the output transit_gateway_id to this variablestring""no
<a name="input_id_length_limit"></a> id_length_limitLimit id to this many characters (minimum 6).<br/>Set to 0 for unlimited length.<br/>Set to null for keep the existing setting, which defaults to 0.<br/>Does not affect id_full.numbernullno
<a name="input_label_key_case"></a> label_key_caseControls the letter case of the tags keys (label names) for tags generated by this module.<br/>Does not affect keys of tags passed in via the tags input.<br/>Possible values: lower, title, upper.<br/>Default value: title.stringnullno
<a name="input_label_order"></a> label_orderThe order in which the labels (ID elements) appear in the id.<br/>Defaults to ["namespace", "environment", "stage", "name", "attributes"].<br/>You can omit any of the 6 labels ("tenant" is the 6th), but at least one must be present.list(string)nullno
<a name="input_label_value_case"></a> label_value_caseControls the letter case of ID elements (labels) as included in id,<br/>set as tag values, and output by this module individually.<br/>Does not affect values of tags passed in via the tags input.<br/>Possible values: lower, title, upper and none (no transformation).<br/>Set this to title and set delimiter to "" to yield Pascal Case IDs.<br/>Default value: lower.stringnullno
<a name="input_labels_as_tags"></a> labels_as_tagsSet of labels (ID elements) to include as tags in the tags output.<br/>Default is to include all labels.<br/>Tags with empty values will not be included in the tags output.<br/>Set to [] to suppress all generated tags.<br/>Notes:<br/> The value of the name tag, if included, will be the id, not the name.<br/> Unlike other null-label inputs, the initial setting of labels_as_tags cannot be<br/> changed in later chained modules. Attempts to change it will be silently ignored.set(string)<pre>[<br/> "default"<br/>]</pre>no
<a name="input_name"></a> nameID element. Usually the component or solution name, e.g. 'app' or 'jenkins'.<br/>This is the only ID element not also included as a tag.<br/>The "name" tag is set to the full id string. There is no tag with the value of the name input.stringnullno
<a name="input_namespace"></a> namespaceID element. Usually an abbreviation of your organization name, e.g. 'eg' or 'cp', to help ensure generated IDs are globally uniquestringnullno
<a name="input_preshared_key_enabled"></a> preshared_key_enabledFlag to enable adding the preshared keys to the VPN connectionbooltrueno
<a name="input_regex_replace_chars"></a> regex_replace_charsTerraform regular expression (regex) string.<br/>Characters matching the regex will be removed from the ID elements.<br/>If not set, "/[^a-zA-Z0-9-]/" is used to remove all characters other than hyphens, letters and digits.stringnullno
<a name="input_region"></a> regionAWS Regionstringn/ayes
<a name="input_ssm_enabled"></a> ssm_enabledFlag to enable saving the tunnel1_preshared_key and tunnel2_preshared_key in the SSM Parameter Storeboolfalseno
<a name="input_ssm_path_prefix"></a> ssm_path_prefixSSM Key path prefix for the associated SSM parametersstring""no
<a name="input_stage"></a> stageID element. Usually used to indicate role, e.g. 'prod', 'staging', 'source', 'build', 'test', 'deploy', 'release'stringnullno
<a name="input_tags"></a> tagsAdditional tags (e.g. {'BusinessUnit': 'XYZ'}).<br/>Neither the tag keys nor the tag values will be modified by this module.map(string){}no
<a name="input_tenant"></a> tenantID element _(Rarely used, not included by default)_. A customer identifier, indicating who this instance of a resource is forstringnullno
<a name="input_transit_gateway_enabled"></a> transit_gateway_enabledSet to true to enable VPN connection to transit gateway and then pass in the existing_transit_gateway_idboolfalseno
<a name="input_transit_gateway_route_table_id"></a> transit_gateway_route_table_idThe ID of the route table for the transit gateway that you want to associate + propagate the VPN connection's TGW attachmentstringnullno
<a name="input_transit_gateway_routes"></a> transit_gateway_routesA map of transit gateway routes to create on the given TGW route table (via transit_gateway_route_table_id) for the created VPN Attachment. Use the key in the map to describe the route<pre>map(object({<br/> blackhole = optional(bool, false)<br/> destination_cidr_block = string<br/> }))</pre>{}no
<a name="input_vpc_component_name"></a> vpc_component_nameAtmos VPC component namestring"vpc"no
<a name="input_vpn_connection_local_ipv4_network_cidr"></a> vpn_connection_local_ipv4_network_cidrThe IPv4 CIDR on the Customer Gateway (on-premises) side of the VPN connectionstring"0.0.0.0/0"no
<a name="input_vpn_connection_log_retention_in_days"></a> vpn_connection_log_retention_in_daysSpecifies the number of days you want to retain log eventsnumber30no
<a name="input_vpn_connection_remote_ipv4_network_cidr"></a> vpn_connection_remote_ipv4_network_cidrThe IPv4 CIDR on the AWS side of the VPN connectionstring"0.0.0.0/0"no
<a name="input_vpn_connection_static_routes_destinations"></a> vpn_connection_static_routes_destinationsList of CIDR blocks to be used as destination for static routes. Routes to destinations will be propagated to the VPC route tableslist(string)[]no
<a name="input_vpn_connection_static_routes_only"></a> vpn_connection_static_routes_onlyIf set to true, the VPN connection will use static routes exclusively. Static routes must be used for devices that don't support BGPboolfalseno
<a name="input_vpn_connection_tunnel1_cloudwatch_log_enabled"></a> vpn_connection_tunnel1_cloudwatch_log_enabledEnable or disable VPN tunnel logging feature for the tunnelboolfalseno
<a name="input_vpn_connection_tunnel1_cloudwatch_log_output_format"></a> vpn_connection_tunnel1_cloudwatch_log_output_formatSet log format for the tunnel. Default format is json. Possible values are json and textstring"json"no
<a name="input_vpn_connection_tunnel1_dpd_timeout_action"></a> vpn_connection_tunnel1_dpd_timeout_actionThe action to take after DPD timeout occurs for the first VPN tunnel. Specify restart to restart the IKE initiation. Specify clear to end the IKE session. Valid values are clear | none | restartstring"clear"no
<a name="input_vpn_connection_tunnel1_ike_versions"></a> vpn_connection_tunnel1_ike_versionsThe IKE versions that are permitted for the first VPN tunnel. Valid values are ikev1 | ikev2list(string)[]no
<a name="input_vpn_connection_tunnel1_inside_cidr"></a> vpn_connection_tunnel1_inside_cidrThe CIDR block of the inside IP addresses for the first VPN tunnelstringnullno
<a name="input_vpn_connection_tunnel1_phase1_dh_group_numbers"></a> vpn_connection_tunnel1_phase1_dh_group_numbersList of one or more Diffie-Hellman group numbers that are permitted for the first VPN tunnel for phase 1 IKE negotiations. Valid values are 2 | 5 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24list(string)[]no
<a name="input_vpn_connection_tunnel1_phase1_encryption_algorithms"></a> vpn_connection_tunnel1_phase1_encryption_algorithmsList of one or more encryption algorithms that are permitted for the first VPN tunnel for phase 1 IKE negotiations. Valid values are AES128 | AES256 | AES128-GCM-16 | AES256-GCM-16list(string)[]no
<a name="input_vpn_connection_tunnel1_phase1_integrity_algorithms"></a> vpn_connection_tunnel1_phase1_integrity_algorithmsOne or more integrity algorithms that are permitted for the first VPN tunnel for phase 1 IKE negotiations. Valid values are SHA1 | SHA2-256 | SHA2-384 | SHA2-512list(string)[]no
<a name="input_vpn_connection_tunnel1_phase2_dh_group_numbers"></a> vpn_connection_tunnel1_phase2_dh_group_numbersList of one or more Diffie-Hellman group numbers that are permitted for the first VPN tunnel for phase 2 IKE negotiations. Valid values are 2 | 5 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24list(string)[]no
<a name="input_vpn_connection_tunnel1_phase2_encryption_algorithms"></a> vpn_connection_tunnel1_phase2_encryption_algorithmsList of one or more encryption algorithms that are permitted for the first VPN tunnel for phase 2 IKE negotiations. Valid values are AES128 | AES256 | AES128-GCM-16 | AES256-GCM-16list(string)[]no
<a name="input_vpn_connection_tunnel1_phase2_integrity_algorithms"></a> vpn_connection_tunnel1_phase2_integrity_algorithmsOne or more integrity algorithms that are permitted for the first VPN tunnel for phase 2 IKE negotiations. Valid values are SHA1 | SHA2-256 | SHA2-384 | SHA2-512list(string)[]no
<a name="input_vpn_connection_tunnel1_preshared_key"></a> vpn_connection_tunnel1_preshared_keyThe preshared key of the first VPN tunnel. The preshared key must be between 8 and 64 characters in length and cannot start with zero. Allowed characters are alphanumeric characters, periods(.) and underscores(_)stringnullno
<a name="input_vpn_connection_tunnel1_startup_action"></a> vpn_connection_tunnel1_startup_actionThe action to take when the establishing the tunnel for the first VPN connection. By default, your customer gateway device must initiate the IKE negotiation and bring up the tunnel. Specify start for AWS to initiate the IKE negotiation. Valid values are add | startstring"add"no
<a name="input_vpn_connection_tunnel2_cloudwatch_log_enabled"></a> vpn_connection_tunnel2_cloudwatch_log_enabledEnable or disable VPN tunnel logging feature for the tunnelboolfalseno
<a name="input_vpn_connection_tunnel2_cloudwatch_log_output_format"></a> vpn_connection_tunnel2_cloudwatch_log_output_formatSet log format for the tunnel. Default format is json. Possible values are json and textstring"json"no
<a name="input_vpn_connection_tunnel2_dpd_timeout_action"></a> vpn_connection_tunnel2_dpd_timeout_actionThe action to take after DPD timeout occurs for the second VPN tunnel. Specify restart to restart the IKE initiation. Specify clear to end the IKE session. Valid values are clear | none | restartstring"clear"no
<a name="input_vpn_connection_tunnel2_ike_versions"></a> vpn_connection_tunnel2_ike_versionsThe IKE versions that are permitted for the second VPN tunnel. Valid values are ikev1 | ikev2list(string)[]no
<a name="input_vpn_connection_tunnel2_inside_cidr"></a> vpn_connection_tunnel2_inside_cidrThe CIDR block of the inside IP addresses for the second VPN tunnelstringnullno
<a name="input_vpn_connection_tunnel2_phase1_dh_group_numbers"></a> vpn_connection_tunnel2_phase1_dh_group_numbersList of one or more Diffie-Hellman group numbers that are permitted for the second VPN tunnel for phase 1 IKE negotiations. Valid values are 2 | 5 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24list(string)[]no
<a name="input_vpn_connection_tunnel2_phase1_encryption_algorithms"></a> vpn_connection_tunnel2_phase1_encryption_algorithmsList of one or more encryption algorithms that are permitted for the second VPN tunnel for phase 1 IKE negotiations. Valid values are AES128 | AES256 | AES128-GCM-16 | AES256-GCM-16list(string)[]no
<a name="input_vpn_connection_tunnel2_phase1_integrity_algorithms"></a> vpn_connection_tunnel2_phase1_integrity_algorithmsOne or more integrity algorithms that are permitted for the second VPN tunnel for phase 1 IKE negotiations. Valid values are SHA1 | SHA2-256 | SHA2-384 | SHA2-512list(string)[]no
<a name="input_vpn_connection_tunnel2_phase2_dh_group_numbers"></a> vpn_connection_tunnel2_phase2_dh_group_numbersList of one or more Diffie-Hellman group numbers that are permitted for the second VPN tunnel for phase 2 IKE negotiations. Valid values are 2 | 5 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24list(string)[]no
<a name="input_vpn_connection_tunnel2_phase2_encryption_algorithms"></a> vpn_connection_tunnel2_phase2_encryption_algorithmsList of one or more encryption algorithms that are permitted for the second VPN tunnel for phase 2 IKE negotiations. Valid values are AES128 | AES256 | AES128-GCM-16 | AES256-GCM-16list(string)[]no
<a name="input_vpn_connection_tunnel2_phase2_integrity_algorithms"></a> vpn_connection_tunnel2_phase2_integrity_algorithmsOne or more integrity algorithms that are permitted for the second VPN tunnel for phase 2 IKE negotiations. Valid values are SHA1 | SHA2-256 | SHA2-384 | SHA2-512list(string)[]no
<a name="input_vpn_connection_tunnel2_preshared_key"></a> vpn_connection_tunnel2_preshared_keyThe preshared key of the second VPN tunnel. The preshared key must be between 8 and 64 characters in length and cannot start with zero. Allowed characters are alphanumeric characters, periods(.) and underscores(_)stringnullno
<a name="input_vpn_connection_tunnel2_startup_action"></a> vpn_connection_tunnel2_startup_actionThe action to take when the establishing the tunnel for the second VPN connection. By default, your customer gateway device must initiate the IKE negotiation and bring up the tunnel. Specify start for AWS to initiate the IKE negotiation. Valid values are add | startstring"add"no
<a name="input_vpn_gateway_amazon_side_asn"></a> vpn_gateway_amazon_side_asnThe Autonomous System Number (ASN) for the Amazon side of the VPN Gateway. If you don't specify an ASN, the Virtual Private Gateway is created with the default ASNnumbernullno

Outputs

NameDescription
<a name="output_customer_gateway_id"></a> customer_gateway_idCustomer Gateway ID
<a name="output_vpn_connection_customer_gateway_configuration"></a> vpn_connection_customer_gateway_configurationThe configuration information for the VPN connection's Customer Gateway (in the native XML format)
<a name="output_vpn_connection_id"></a> vpn_connection_idVPN Connection ID
<a name="output_vpn_connection_tunnel1_address"></a> vpn_connection_tunnel1_addressThe public IP address of the first VPN tunnel
<a name="output_vpn_connection_tunnel1_cgw_inside_address"></a> vpn_connection_tunnel1_cgw_inside_addressThe RFC 6890 link-local address of the first VPN tunnel (Customer Gateway side)
<a name="output_vpn_connection_tunnel1_vgw_inside_address"></a> vpn_connection_tunnel1_vgw_inside_addressThe RFC 6890 link-local address of the first VPN tunnel (Virtual Private Gateway side)
<a name="output_vpn_connection_tunnel2_address"></a> vpn_connection_tunnel2_addressThe public IP address of the second VPN tunnel
<a name="output_vpn_connection_tunnel2_cgw_inside_address"></a> vpn_connection_tunnel2_cgw_inside_addressThe RFC 6890 link-local address of the second VPN tunnel (Customer Gateway side)
<a name="output_vpn_connection_tunnel2_vgw_inside_address"></a> vpn_connection_tunnel2_vgw_inside_addressThe RFC 6890 link-local address of the second VPN tunnel (Virtual Private Gateway side)
<a name="output_vpn_gateway_id"></a> vpn_gateway_idVirtual Private Gateway ID
<!-- END OF PRE-COMMIT-TERRAFORM DOCS HOOK --> <!-- prettier-ignore-end -->

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