Example: Use a ping test for WAN failover from Ethernet to cellular

In this example configuration, the WAN1 interface serves as the primary WAN, while the cellular WWAN1 and WWAN2 interfaces, respectively, serve as the backup WANs. This example assumes a dual-cellular model.

In this example configuration, SureLink is used over for the WAN1 interface to send a probe packet of size 256 bytes to the IP host 43.66.93.111 every 10 seconds. If there are three consecutive failed responses, the default Update Routing recovery action will increase the metric for the WAN1 interface by 100, which will cause the TX54 device to start using the WWAN1 interface as the default route.

If the TX54 device cannot get a connection on the WWAN1 interface, it attempts to use the WWAN2 interface. It continues to regularly test the connection to WAN1 and WWAN1, and when tests on one of those WANs succeeds, the device falls back to the successful highest priority WAN.

To achieve this WAN failover from the WAN1 to the WWAN1 and WWAN2 interfaces, the WAN failover configuration is:


  1. Log into Digi Remote Manager, or log into the local Web UI as a user with full Admin access rights.
  2. Access the device configuration:

    1. Locate your device as described in Use Digi Remote Manager to view and manage your device.
    2. Click the Device ID.
    3. Click Settings.
    4. Click to expand Config.

    1. On the menu, click System. Under Configuration, click Device Configuration.

      The Configuration window is displayed.

  3. Configure active recovery on WAN1:
    1. Click Network > Interface > WAN1 > SureLink.

    2. For Test interval, type 10s.
    3. Click to expand Tests.
    4. Disable the default DNS test:
      1. Click to expand the default DNS configured test.
      2. Click to toggle off Enable.
    5. Click to add a new test.

    6. For Test type, select Ping test.
    7. For Ping host, type 43.66.93.111.
    8. For Ping payload size, type 256.

  4. Repeat the above step for WWAN1 and WWAN2 to enable SureLink on those interfaces.
  5. Configure WWAN1 to have priority over WWAN2. The default configurations for WWAN1 and WWAN2 both have the metric set to 3, while WAN1 has a metric of 1. To configure WWAN1 to have priority over WWAN2 and continue to be serve as a backup to WAN1, WWAN1's metric should be set to 2.
    1. Click Network > Interface > WWAN1 > IPv4.
    2. For Metric, type 2.

  6. Click Apply to save the configuration and apply the change.
  1. Select the device in Remote Manager and click Actions > Open Console, or log into the TX54 local command line as a user with full Admin access rights.

    Depending on your device configuration, you may be presented with an Access selection menu. Type admin to access the Admin CLI.

  2. At the command line, type config to enter configuration mode:
    > config
(config)>
  3. Configure SureLink on WAN1:

    1. Set the interval to ten seconds:

      (config)> network interface wan1 surelink interval 10s
(config)>
    2. Disable the default DNS test:
      (config)> network interface wan1 surelink tests 0 enable false
(config)>

    3. Add a test:

      (config)> add network interface wan1 surelink tests end
(config network interface wan1 surelink tests 1)>

    4. Set the probe type to ping:

      (config network interface wan1 ipv4 surelink tests 1)> test ping
(config network interface wan1 ipv4 surelink tests 1)>

    5. Set the packet size to 256 bytes:

      (config network interface wan1 ipv4 surelink tests 1)> ping_size 256
(config network interface wan1 ipv4 surelink tests 1)>

    6. Set the host to ping:

      (config network interface wan1 ipv4 surelink tests 1)> ping_host 43.66.93.111
(config network interface wan1 ipv4 surelink tests 1)>
  4. Repeat the above step for the cellular WWAN1 (wwan1) and WWAN2 (wwan2) interfaces to enable SureLink on those interfaces. Note that this will cause the interfaces to send a ping every 10 seconds, which will incur data costs.

  5. Configure WWAN1 to have priority over WWAN2. The default configurations for WWAN1 and WWAN2 both have the metric set to 3, while WAN1 has a metric of 1. To configure WWAN1 to have priority over WWAN2 and continue to be serve as a backup to WAN1, WWAN1's metric should be set to 2.

    1. Type ... to return to the root of the config prompt:
      (config network interface wan1 surelink tests 1)> ...
(config)>
    2. Set the metric for WWAN1:
      (config)> network interface wwan1 ipv4 metric 2
(config)>
  6. Save the configuration and apply the change
    (config)> save
Configuration saved.
>
  7. Type exit to exit the Admin CLI.

    Depending on your device configuration, you may be presented with an Access selection menu. Type quit to disconnect from the device.