Adding a Cloud VPN tunnel

This page describes how to add a second VPN tunnel to HA VPN or Classic VPN.

If you haven't set up your HA VPN gateway and tunnel yet, see the following:

Adding a tunnel from an HA VPN gateway to a peer VPN gateway

To receive a 99.99% uptime SLA, configure a tunnel on each HA VPN interface. This section includes the steps to configure a second tunnel on the second interface of an HA VPN gateway.

Configure a second tunnel in the following circumstances:

  • If you configured an HA VPN gateway to a peer VPN gateway that has a single peer VPN interface.
  • If you set up a single tunnel previously on an HA VPN for a peer VPN gateway that contains any number of interfaces, but now want a 99.99% uptime SLA for your HA VPN gateway.

To configure a second tunnel, complete the following steps.

Console

  1. In the Google Cloud Console, go to the VPN page.

    Go to VPN

  2. Click Create VPN tunnel.

  3. From the drop-down menu, select the gateway that requires the second tunnel, and then click Continue.

  4. Choose a Cloud Router. If you haven't configured a Cloud Router, follow the steps for creating one in the Create VPN tunnels procedure.

  5. For Peer VPN gateway, select On-prem or Non Google Cloud.

  6. For Peer VPN gateway name, choose the existing peer VPN gateway resource that the new tunnel will use. To check existing peer VPN gateway names for this Cloud VPN gateway, under VPN gateway name near the top of the page, click View all existing tunnels.

  7. You might receive a warning that a tunnel with the same peer VPN gateway interface is already associated with the same local Cloud VPN gateway interface. To fix this issue, under Associated Cloud VPN gateway interface, select the other HA VPN interface.

  8. To finish configuring the tunnel, configure the remainder of the steps as listed in the Create VPN tunnels procedure.

Adding a tunnel from an HA VPN gateway to another HA VPN gateway

This section includes the steps to configure a second tunnel on the second interface of an HA VPN gateway.

If you configured one tunnel on an HA VPN gateway to another HA VPN gateway but want to receive a 99.99% uptime SLA, you must configure a second tunnel. Configure a tunnel on each HA VPN interface on each side of an HA VPN-to-HA VPN gateway configuration.

To configure a second tunnel, complete the following steps.

Console

  1. In the Cloud Console, go to the VPN page.

    Go to VPN

  2. Find the HA VPN that you want to add the tunnel to.

  3. Click Add VPN tunnel.

  4. Under Peer VPN gateway, select Google Cloud.

  5. Under Project, select a Google Cloud project that will contain the new gateway.

  6. For VPN gateway name, choose the other HA VPN gateway that the new tunnel connects to.

  7. Select Add the second VPN tunnel to an existing VPN tunnel for high availability.

  8. Under Select existing VPN tunnel, make sure that the existing tunnel is selected. You can click a link to view all existing tunnels near the top of the same page.

  9. Specify a tunnel Name.

  10. Specify the same IKE version in use by the tunnel on the other gateway.

  11. Specify an IKE pre-shared key by using your pre-shared key (shared secret), which must correspond with the pre-shared key for the partner tunnel that you create on your peer gateway. If you haven't configured a pre-shared key on your peer VPN gateway and want to generate one, click Generate and copy. Make sure that you record the pre-shared key in a secure location because it cannot be retrieved after you create your VPN tunnels.

  12. Click Create and continue.

  13. Configure and save a BGP session. Otherwise, you can do this later by following the steps in the Create BGP sessions procedure.

  14. Check the Summary and reminder page for configuration information, and then click OK.

Adding a tunnel to Classic VPN

Each Cloud VPN tunnel associated with a Classic VPN gateway must connect to a unique peer VPN gateway, as identified by the peer gateway's IP address. If you need to create a second tunnel to the same peer gateway, you must create that tunnel from a different Cloud VPN gateway.

To configure a second tunnel, complete the following steps.

Console

  1. In the Cloud Console, go to the VPN page.

    Go to VPN

  2. Click the Google VPN gateways tab.

  3. Click the name of an existing VPN gateway.

  4. On the VPN gateway details page, in the Tunnels section, click Add VPN tunnel.

  5. Supply the following information:

    1. In the Name field, enter a name for the tunnel.
    2. In the Remote peer IP address field, enter the external IP address of the peer VPN gateway.
    3. Choose an IKE version compatible with your peer VPN gateway.
    4. Provide the IKE pre-shared key (shared secret) for authentication. For suggestions, see Generating a strong pre-shared key.
    5. Click the appropriate Routing option:
      • To use dynamic routing, click Dynamic (BGP). On the Cloud Router menu, select or create a new Cloud Router. To define the BGP session parameters, in the BGP session field, click Edit. Each BGP IP address range for each BGP session must be unique among all Cloud Routers in all regions of a Virtual Private Cloud (VPC) network.
      • To use route-based VPN, click Route-based. In the Remote network IP ranges field, supply the ranges of IP addresses used by the peer network.
      • To use policy-based routing, click Policy-based. Supply both the Remote network IP ranges and the Local IP ranges. In the Local subnetworks menu, select IP ranges of subnets in a VPC network.
  6. Click Create.

  7. Complete your configuration by following the steps in Configuring the peer VPN gateway.

gcloud

Follow the steps for creating a route-based VPN gateway and tunnel, but start in the section Create the Cloud VPN tunnel.

If the new tunnel has the same CIDR block, you can skip to Configuring firewall rules.

Checking tunnel status

After you configure an HA VPN or Classic VPN tunnel, check its status.

What's next