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Connect from WARP to a private network on Cloudflare using Cloudflare Tunnel

You can use Cloudflare Tunnel to connect applications and services to Cloudflare’s network. Cloudflare Tunnel relies on a piece of software, cloudflared, to create those connections.

You can create and configure Cloudflare Tunnel connections to support multiple HTTP origins or multiple protocols simultaneously. You can also use Cloudflare Tunnel to connect any service that relies on a TCP-based protocol to Cloudflare’s network. Users in your organization can then reach the service by enrolling into your organization’s Zero Trust account and using the WARP agent.

Once enrolled, user endpoints will be able to connect to private RFC 1918 IP space and other ranges that you control. Applications running on those endpoints will be able to reach those private IPs as well in a private network model. Coming soon, administrators will be able to build Zero Trust rules to determine who within your organization can reach those IPs.

This tutorial covers how to:

  • Start a secure, outbound-only, connection from a machine to Cloudflare
  • Assign the machine an IP that can consist of an RFC 1918 IP address or range
  • Connect to that private IP space from an enrolled WARP agent without client-side configuration changes
  • Connect using any TCP-based protocol

Time to complete: 45 minutes


​​ Install cloudflared

  1. Download and install the Cloudflare Tunnel daemon, cloudflared.

  2. Run the following command in your Terminal to authenticate this instance of cloudflared into your Cloudflare account.

    $ cloudflared login

    The command will launch a browser window and prompt you to login with your Cloudflare account. Choose a website that you have added into your account. This will authenticate your instance of cloudflared to your Cloudflare account — you will be able to create a Tunnel for any site, not just the site selected.

  3. Once you select one of the sites in your account, Cloudflare will download a certificate file called cert.pem to authenticate this instance of cloudflared. The cert.pem file uses a certificate to authenticate your instance of cloudflared and includes an API key for your account to perform actions like DNS record changes.

You can now use cloudflared to control Cloudflare Tunnel connections in your Cloudflare account.

​​ Create a Tunnel

You can now create a Tunnel that will connect cloudflared to Cloudflare’s edge.

  1. Begin by creating a Tunnel with an associated name. This example uses the name grafana.

    $ cloudflared tunnel create grafana

    You can confirm the ID of the Tunnel by running the following command.

    $ cloudflared tunnel list
  2. Create a route. Routes map a Tunnel ID to a CIDR range that you specify. You can use private IP space specified by RFC 1918 or other routes. The private IP space specified should match the private IP space of your subnet or environment where Cloudflare Tunnel will send connections.

    This example tells Cloudflare Tunnel that, for users in this organization, connections to 100.64.0.0/10 should be served by this Tunnel. For the purposes of this tutorial, Grafana is running in a DigitalOcean environment where a virtual interface has been applied that will send traffic bound for localhost to 100.64.0.1.

    $ cloudflared tunnel route ip add 100.64.0.0/10 8e343b13-a087-48ea-825f-9783931ff2a5
  3. Similar to the list command, you can confirm the routes enrolled with the following command.

    $ cloudflared tunnel route ip show

    Terminal listing example route enrollments

​​ Configure and run the Tunnel

  1. Create a configuration file for the tunnel in the .cloudflared default directory. The following template contains the required fields but can be further modified as needed.

    tunnel: 8e343b13-a087-48ea-825f-9783931ff2a5
    credentials-file: /root/.cloudflared/8e343b13-a087-48ea-825f-9783931ff2a5.json
    warp-routing:
    enabled: true
  2. You can now run the Tunnel. The command below will connect this instance of cloudflared to Cloudflare’s network. Traffic inside of your organization, from enrolled WARP agents, will be sent to this instance when the destination is this private IP range.

    $ cloudflared tunnel run grafana

This example runs it from the command-line but we recommend running cloudflared as a service for long-lived connections.

​​ Route private IP ranges through WARP

Users can reach this private service by logging in to their Zero Trust account and the WARP agent.

By default, Cloudflare WARP excludes traffic bound for RFC 1918 space and certain other routes as part of its Split Tunnel feature. To use this feature the IPs that you specified for your Tunnel must be included which will send traffic for those destinations through the WARP agent and to the Tunnel.

  1. Ensure that your Split Tunnels mode is set to Exclude IPs and domains.

  2. In the list of Split Tunnels entries, choose the range being used for this private connection and delete it.

​​ Integrate your identity provider

Users can now connect over this private network by enrolling their devices into the WARP agent in the same account as the Cloudflare Tunnel configuration. They must use Gateway with WARP mode.

You can begin to enroll devices by determining which users are allowed to enroll.

On the Zero Trust dashboard, select your account and go to Settings > Authentication. Cloudflare Zero Trust will automatically create a “One-time PIN” option which will rely on your user’s emails. You can begin using the one-time PIN option immediately or integrate your corporate identity provider.

​​ Determine which devices can enroll

  1. Go to Settings > WARP Client.

  2. Within Device enrollment permissions, select Manage.

  3. Select Add a rule.

    Determine who is allowed to enroll by using criteria including Access groups, groups from your identity provider, email domain, or named users. This example allows any user with a @cloudflare.com account to enroll.

    Example device enrollment config to allow Cloudflare users

  4. Select Save.

Your rule will now be visible under the Device enrollment rules list.

​​ Enable the Cloudflare proxy

  1. Go to Settings > Network.

  2. Enable Proxy.

This will tell Cloudflare to begin proxying any traffic from enrolled devices, except the traffic excluded using the split tunnel settings.

​​ (Optional) Enable HTTPS inspection

  1. Download and install the Cloudflare certificate on your devices.

    Installing the certificate is not a requirement for private network routing. However, the certificate allows Cloudflare Gateway to inspect and secure HTTPS traffic to your private network. You can distribute this certificate through an MDM provider or install it manually.

  2. Go to Settings > Network and enable TLS decryption.

    This will tell Cloudflare to begin decrypting traffic for inspection from enrolled devices, except the traffic excluded from inspection.

​​ Enroll a device

  1. Follow the instructions to install the WARP client depending on your device type. Cloudflare Gateway does not need a special version of the client.

  2. Once the client is installed, select the gear icon.

  3. Under the Account tab, select Login with Cloudflare Zero Trust.

  4. Input your team name. You can find it on the Zero Trust Dashboard under Settings > General.

The user will be prompted to login with the identity provider configured in Cloudflare Access. Once authenticated, the client will update to Teams mode. You can select the gear to toggle between DNS filtering or full proxy. In this use case, you must select Gateway with WARP. These settings can be configured globally for an organization through a device management platform.

​​ Connect via WARP

Once enrolled, your users will be able to connect to the private IPs configured for HTTP traffic in this example or arbitrary TCP traffic.