Help Center> Virtual Private Network> User Guide> Enterprise Edition S2C VPN> Enterprise Edition VPN Connection Management> Creating a VPN Connection
Updated on 2024-06-27 GMT+08:00
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Creating a VPN Connection

Scenario

To connect your on-premises data center or private network to your ECSs in a VPC, you need to create VPN connections after creating a VPN gateway and a customer gateway.

Notes and Constraints

  • When creating a VPN connection in static routing mode, ensure that the customer gateway supports ICMP and is correctly configured with the customer interface IP address of the VPN connection before enabling NQA. Otherwise, traffic will fail to be forwarded.
  • When creating a VPN connection in policy-based mode and adding multiple policy rules, ensure that the source and destination CIDR blocks in the rules do not overlap. Otherwise, data flows may be incorrectly matched or IPsec tunnels may flap.

Procedure

  1. Log in to the management console.
  2. Click in the upper left corner and select the desired region and project.
  3. Click in the upper left corner, select a region, and choose Network > Virtual Private Network.
  4. In the navigation pane on the left, choose Virtual Private Network > Enterprise – VPN Connections.
  5. On the VPN Connection page, click Buy VPN Connection.

    For higher reliability, you are advised to create a VPN connection between each of the two EIPs of a VPN gateway and a customer gateway.

  6. Set parameters as prompted and click Next.
    Table 1 lists the VPN connection parameters.
    Table 1 Description of VPN connection parameters

    Parameter

    Description

    Example Value

    Name

    Name of a VPN connection. The value can contain only letters, digits, underscores (_), hyphens (-), and periods (.).

    vpn-001

    VPN Gateway

    Name of the VPN gateway for which the VPN connection is created.

    You can also click Create VPN Gateway to create a VPN gateway. For details about related parameters, see Table 2.

    If you use a VPN gateway of the GM specification and no certificate has been bound to the VPN gateway, click Upload Certificate to upload certificates. Otherwise, VPN connections cannot be set up.

    vpngw-001

    Gateway IP Address

    IP address of the VPN gateway.

    The same EIP of a VPN gateway cannot be repeatedly selected when you create VPN connections between the VPN gateway and the same customer gateway.

    Available gateway IP address

    Customer Gateway

    Name of a customer gateway.

    You can also click Create Customer Gateway to create a customer gateway. For details about related parameters, see Table 1.

    If you use a customer gateway that supports SM series cryptographic algorithms and no CA certificate has been bound to the customer gateway, upload a CA certificate by referring to Uploading a Certificate for a Customer Gateway. Otherwise, VPN connections cannot be set up.

    NOTE:

    If a customer gateway connects to multiple VPN gateways, the BGP ASNs and VPN types of the VPN gateways must be the same.

    cgw-001

    VPN Type

    IPsec connection mode, which can be route-based or policy-based.

    • Static routing

      Determines the data that enters the IPsec VPN tunnel based on the route configuration (local subnet and customer subnet).

      Application scenario: Communication between customer gateways

    • BGP routing

      Determines the traffic that can enter the IPsec VPN tunnel based on BGP routes.

      Application scenario: Communication between customer gateways, many or frequently changing interconnection subnets, or backup between VPN and Direct Connect

    • Policy-based

      Determines the data that enters the IPsec VPN tunnel based on the policy (between the customer network and VPC). Policy rules can be defined based on the source and destination CIDR blocks.

      Application scenario: Isolation between customer gateways

    • Policy template

      The VPN gateway passively responds to the IPsec connection requests from the customer gateway. After authenticating the customer gateway, the VPN gateway accepts the policy rules defined on the customer gateway based on source and destination CIDR blocks.

      Application scenario: The customer gateway uses a non-fixed IP address.

    Static routing

    Customer Subnet

    Customer-side subnet that needs to access the VPC on the cloud through VPN connections.

    If there are multiple customer subnets, separate them with commas (,).

    NOTE:
    • The customer subnet can overlap with the local subnet but cannot be the same as the local subnet.
    • A customer subnet cannot be included in the existing subnets of the VPC associated with the VPN gateway. It also cannot be the destination address in the route table of the VPC associated with the VPN gateway.
    • Customer subnets cannot be the reserved CIDR blocks of VPCs, for example, 100.64.0.0/10 or 214.0.0.0/8.

    172.16.1.0/24,172.16.2.0/24

    Interface IP Address Assignment

    This parameter is available only when VPN Type is set to Static routing or BGP routing.

    NOTE:
    • Set interface IP addresses to the tunnel interface IP addresses used by the VPN gateway and customer gateway to communicate with each other.
    • If the tunnel interface address of the customer gateway is fixed, select Manually specify, and set the tunnel interface address of the VPN gateway based on the tunnel interface address of the customer gateway.
    • Manually specify

      Set Local Tunnel Interface Address to the tunnel interface address of the VPN gateway, which can reside only on the 169.254.x.x/30 CIDR block (except 169.254.195.x/30). Then, the system automatically sets Customer Tunnel Interface Address to a random value based on the setting of Local Tunnel Interface Address.

      For example, when you set Local Tunnel Interface Address to 169.254.1.6/30, the system automatically sets Customer Tunnel Interface Address to 169.254.1.5/30.

    • Automatically assign

      By default, an IP address on the 169.254.x.x/30 CIDR block is assigned to the tunnel interface of the VPN gateway.

      To view the automatically assigned local and customer interface IP addresses, click Modify VPN Connection on the VPN Connections page.

    Automatically assign

    Local Tunnel Interface Address

    This parameter is available only when Interface IP Address Assignment is set to Manually specify.

    Tunnel interface IP address configured on the VPN gateway.

    N/A

    Customer Tunnel Interface Address

    This parameter is available only when Interface IP Address Assignment is set to Manually specify.

    Tunnel interface IP address configured on the customer gateway device.

    N/A

    Link Detection

    This parameter is available only when VPN Type is set to Static routing.

    NOTE:

    When enabling this function, ensure that the customer gateway supports ICMP and is correctly configured with the customer interface IP address of the VPN connection. Otherwise, traffic will fail to be forwarded.

    After this function is enabled, the VPN gateway automatically performs Network Quality Analysis (NQA) on the customer interface IP address of the customer gateway. For details about NQA, see Huawei Cloud VPN NQA.

    Selected

    PSK

    The PSKs configured for the VPN gateway and customer gateway must be the same.

    The PSK:

    • Contains 8 to 128 characters.
    • Can contain only three or more types of the following characters:
      • Digits
      • Uppercase letters
      • Lowercase letters
      • Special characters: ~ ! @ # $ % ^ ( ) - _ + = { } , . / : ;
    NOTE:

    This parameter is not available for VPN connections set up using SM series cryptographic algorithms.

    Test@123

    Confirm PSK

    Enter the PSK again.

    NOTE:

    This parameter is not available for VPN connections set up using SM series cryptographic algorithms.

    Test@123

    Policy

    This parameter is available only when VPN Type is set to Policy-based.

    Defines the data flow that enters the encrypted VPN connection between the local and customer subnets. You need to configure the source and destination CIDR blocks in each policy rule. By default, a maximum of five policy rules can be configured.

    • Source CIDR Block

      The source CIDR block must contain some CIDR blocks of the local subnets. 0.0.0.0/0 indicates any IP address.

    • Destination CIDR Block

      The destination CIDR block must contain all the CIDR blocks of the customer subnets. A policy rule supports a maximum of five destination CIDR blocks, which are separated by commas (,).
    • Source CIDR block 1: 192.168.1.0/24
    • Destination CIDR block 1: 172.16.1.0/24,172.16.2.0/24
    • Source CIDR block 2: 192.168.2.0/24
    • Destination CIDR block 2: 172.16.1.0/24,172.16.2.0/24

    Advanced Settings
    • Default: Use default IKE and IPsec policies.
    • Custom: Use custom IKE and IPsec policies. For details about the policies, see Table 2 and Table 3.

    Custom

    Policy Template

    This parameter is available only when VPN Type is set to Policy template.

    The policy template cannot be modified here. For details about the modification, see Modifying the Policy Template of a VPN Gateway.

    -

    Tag

    Identifier of a VPN resource. The value consists of a key and a value. A maximum of 20 tags can be added.

    You can select predefined tags or customize tags.

    To view predefined tags, click View predefined tags.

    -
    Table 2 IKE policy

    Parameter

    Description

    Example Value

    Version

    Version of the IKE protocol. The value can be one of the following:

    • v1 (v1 has low security. If the device supports v2, v2 is recommended.)

      The IKE version can only be v1 for VPN connections set up using SM series cryptographic algorithms.

    • v2

    The default value is v1 for VPN connections set up using SM series cryptographic algorithms.

    The default value is v2 for VPN connections that are not set up using SM series cryptographic algorithms.

    v2

    Negotiation Mode

    This parameter is available only when Version is v1.

    • Main

      Only Main is available if a VPN gateway of the GM specification is selected.

    • Aggressive

    Main

    Authentication Algorithm

    Hash algorithm used for authentication. The following options are available:

    • SHA1(Insecure. Not recommended.)
    • MD5(Insecure. Not recommended.)
    • SHA2-256
    • SHA2-384
    • SHA2-512
    • SM3

      This authentication algorithm is available only for VPN connections set up using an SM series cryptographic algorithm. In this case, the IKE version can only be v1.

    The default value is SM3 for VPN connections set up using SM series cryptographic algorithms.

    The default value is SHA2-256 for VPN connections that are not set up using SM series cryptographic algorithms.

    SHA2-256

    Encryption Algorithm

    Encryption algorithm. The following options are available:

    • 3DES(Insecure. Not recommended.)
    • AES-128(Insecure. Not recommended.)
    • AES-192(Insecure. Not recommended.)
    • AES-256(Insecure. Not recommended.)
    • AES-256-GCM-16

      When this encryption algorithm is used, the IKE version can only be v2.

    • SM4

      This encryption algorithm is available only for VPN connections set up using an SM series cryptographic algorithm. In this case, the IKE version can only be v1.

    The default value is SM4 for VPN connections set up using SM series cryptographic algorithms.

    The default value is AES-128 for VPN connections that are not set up using SM series cryptographic algorithms.

    AES-128

    DH Algorithm

    The following algorithms are supported:

    • Group 1(Insecure. Not recommended.)
    • Group 2(Insecure. Not recommended.)
    • Group 5(Insecure. Not recommended.)
    • Group 14(Insecure. Not recommended.)
    • Group 15
    • Group 16
    • Group 19
    • Group 20
    • Group 21

    The default value is Group 15.

    NOTE:

    This parameter is not available for VPN connections set up using SM series cryptographic algorithms.

    Group 14

    Lifetime (s)

    Lifetime of a security association (SA).

    An SA will be renegotiated when its lifetime expires.

    • Unit: second
    • The value ranges from 60 to 604800.
    • The default value is 86400.

    86400

    Local ID

    Authentication identifier of the VPN gateway used in IPsec negotiation. The VPN gateway ID configured on the customer gateway must be the same as the local ID configured here. Otherwise, IPsec negotiation fails.

    • IP Address (default value)

      The system automatically sets this parameter to the selected EIP of the VPN gateway.

    • FQDN

      Set the FQDN to a string of 1 to 128 case-sensitive characters that can contain letters, digits, and special characters (excluding &, <, >, [, ], \, ?, and spaces).

    NOTE:

    This parameter is not available for VPN connections set up using SM series cryptographic algorithms.

    IP Address

    Customer ID

    Authentication identifier of the customer gateway used in IPsec negotiation. The customer gateway ID configured on the customer gateway must be the same as the customer ID configured here. Otherwise, IPsec negotiation fails.

    • IP Address (default value)

      The system automatically sets this parameter to the IP address of the customer gateway.

    • FQDN

      Set the FQDN to a string of 1 to 128 case-sensitive characters that can contain letters, digits, and special characters (excluding &, <, >, [, ], \, ?, and spaces).

    NOTE:

    This parameter is not available for VPN connections set up using SM series cryptographic algorithms.

    IP Address
    Table 3 IPsec policy

    Parameter

    Description

    Example Value

    Authentication Algorithm

    Hash algorithm used for authentication. The following options are available:

    • SHA1(Insecure. Not recommended.)
    • MD5(Insecure. Not recommended.)
    • SHA2-256
    • SHA2-384
    • SHA2-512
    • SM3

      Select this authentication algorithm only for VPN connections set up using SM series cryptographic algorithms.

    The default value is SM3 for VPN connections set up using SM series cryptographic algorithms.

    The default value is SHA2-256 for VPN connections that are not set up using SM series cryptographic algorithms.

    SHA2-256

    Encryption Algorithm

    Encryption algorithm. The following options are available:

    • 3DES(Insecure. Not recommended.)
    • AES-128(Insecure. Not recommended.)
    • AES-192(Insecure. Not recommended.)
    • AES-256(Insecure. Not recommended.)
    • AES-128-GCM-16
    • AES-256-GCM-16
    • SM4

      Select this encryption algorithm only for VPN connections set up using SM series cryptographic algorithms.

    The default value is SM4 for VPN connections set up using SM series cryptographic algorithms.

    The default value is AES-128 for VPN connections that are not set up using SM series cryptographic algorithms.

    AES-128

    PFS

    Algorithm used by the Perfect forward secrecy (PFS) function.

    PFS supports the following algorithms:

    • Disable(Insecure. Not recommended.)
    • DH group 1(Insecure. Not recommended.)
    • DH group 2(Insecure. Not recommended.)
    • DH group 5(Insecure. Not recommended.)
    • DH group 14(Insecure. Not recommended.)
    • DH group 15
    • DH group 16
    • DH group 19
    • DH group 20
    • DH group 21

    The default value is DH group 15.

    NOTE:
    • This parameter is not available for VPN connections set up using SM series cryptographic algorithms.
    • When a VPN gateway and customer gateway use an SM series cryptographic algorithm to set up VPN connections, ensure that the PFS function is disabled on the customer gateway. Otherwise, VPN connections cannot be set up.

    DH group 15

    Transfer Protocol

    Security protocol used in IPsec to transmit and encapsulate user data. The following protocols are supported:

    • ESP

    The default value is ESP.

    ESP

    Lifetime (s)

    Lifetime of an SA.

    An SA will be renegotiated when its lifetime expires.

    • Unit: second
    • The value ranges from 30 to 604800.
    • The default value is 3600.

    3600

    Packet Encapsulation Mode

    The default value is TUNNEL.

    TUNNEL

    An IKE policy specifies the encryption and authentication algorithms to use in the negotiation phase of an IPsec tunnel. An IPsec policy specifies the protocol, encryption algorithm, and authentication algorithm to use in the data transmission phase of an IPsec tunnel. The policy settings for VPN connections must be the same at the VPC and on-premises data center sides. If they are different, VPN negotiation will fail, causing the failure to establish VPN connections.

    The following algorithms are not recommended because they are not secure enough:

    • Authentication algorithms: SHA1 and MD5
    • Encryption algorithms: 3DES, AES-128, AES-192, and AES-256

      Because some customer devices do not support secure encryption algorithms, the default encryption algorithm of VPN connections is still AES-128. You are advised to use a more secure encryption algorithm if customer devices support secure encryption algorithms.

    • DH algorithms: Group 1, Group 2, Group 5, and Group 14
  7. Confirm the VPN connection configuration and click Submit.
  8. Repeat the preceding operations to create the other VPN connection.

    For details about IP address configuration, see Context.

    For details about scenario-specific configuration examples, see Administrator Guide.