How do I establish an uplink and learn more about my router’s failover options?

Beverly McRae

 The router can establish an uplink via Ethernet, WiFi as WAN, or 3G/4G modems (integrated or external USB). If the primary WAN connection fails, the router will automatically attempt to bring up a new link on another device: this feature is called failover. If Load Balance is enabled, multiple WAN devices may establish a link concurrently.

WAN Interfaces

This is a list of the available interfaces used to access the Internet. You can enable, stop, or start devices from this section. By using the priority arrows (the arrows in the boxes to the left – these show if you have more than one available interface), you can set the interface the router uses by default and the order that it allows failover.

In the example shown, Ethernet is set as the primary Internet source, while a 4G LTE modem is attached for failover. The Ethernet is “Connected” while the LTE modem is “Available” for failover. A WiFi-as-WAN interface is also attached and “Available”.

  • Load Balance: If this is enabled, the router will use multiple WAN interfaces to increase the data transfer throughput by using any connected WAN interface consecutively. Selecting Load Balance will automatically start the WAN interface and add it to the pool of WAN interfaces to use for data transfer. Turning off Load Balance for an active WAN interface may require the user to restart any current browsing session.
  • Enabled: Selected by default. Deselect to disable an interface.

Click on the small box at the top of the list to select/deselect all devices for either Load Balance or Enabled.

Click on a device in the list to reveal additional information about that device.

Selecting a device reveals the following information:

  • State (Connected, Available, etc.)
  • Port
  • UID (Unique identifier. This could be a name or number/letter combination.)
  • IP Address
  • Gateway
  • Netmask
  • Stats: bytes in, bytes out
  • Uptime

Click “Edit” to view configuration options for the selected device. For 3G/4G modems, click “Control” to view options to activate or update the device.

WAN Configuration

Select a WAN interface and click on Edit to open the WAN Configuration editor. The tabs available in this editor are specific to the particular WAN interface types.

General Settings

Device Settings
  • Enabled: Select/deselect to enable/disable.
  • Force NAT: Normally NAT is part of the Routing Mode setting which is selected on the LAN side in Network Settings → WiFi / Local Networks. Select this option to force NAT whenever this WAN device is being used.
  • Priority: This number controls failover and failback order. The lower the number, the higher the priority and the more use the device will get. This number will change when you move devices around with the priority arrows in the WAN Interfaces list.
  • Load Balance: Select to allow this device to be available for the Load Balance pool.
  • Download bandwidth: Defines the default download bandwidth for use in Load Balance and QoS (quality of service, or traffic shaping) algorithms. (Range: 128 Kb/s to 1 Gb/s.)
  • Upload bandwidth: Defines the default upload bandwidth for use in Load Balance and QoS (quality of service, or traffic shaping) algorithms. (Range: 128 Kb/s to 1 Gb/s.)
  • MTU: Maximum transmission unit. This is the size of the largest protocol data unit that the device can pass. (Range: 46 to 1500 Bytes.)
  • Hostname (This only shows for certain devices.)
IPv4 Failure Check (Advanced)

If this is enabled, the router will check that the highest priority active WAN interface can get to the Internet even if the WAN connection is not actively being used. If the interface goes down, the router will switch to the next highest priority interface available. If this is not selected, the router will still failover to the next highest priority interface but only after the user has attempted to get out to the Internet and failed.

Idle Check Interval: The amount of time between each check. (Default: 30 seconds. Range: 10-3600 seconds.)

Monitor while connected: (Default: Off) Select from the following dropdown options:

  • Passive DNS (modem only): The router will take no action until data is detected that is destined for the WAN. When this data is detected, the data will be sent and the router will check for received data for 2 seconds. If no data is received the router behaves as described below under Active DNS.
  • Active DNS (modem only): A DNS request will be sent to the DNS servers. If no data is received, the DNS request will be retried 4 times at 5-second intervals. (The first 2 requests will be directed at the Primary DNS server and the second 2 requests will be directed at the Secondary DNS server.) If still no data is received, the device will be disconnected and failover will occur.
  • Active Ping: A ping request will be sent to the Ping Target. If no data is received, the ping request will be retried 4 times at 5-second intervals. If still no data is received, the device will be disconnected and failover will occur. When “Active Ping” is selected, the next line gives an estimate of data usage in this form: “Active Ping could use as much as 9.3 MB of data per month.” This amount depends on the Idle Check Interval.
  • Off: Once the link is established the router takes no action to verify that it is still up.

Ping IP Address: If you selected “Active Ping”, you will need to input an IP address. This must be an address that can be reached through your WAN connection (modem/Ethernet). Some ISPs/Carriers block certain addresses, so choose an address that all of your WAN connections can use. For best results, select an established public IP address. For example, you might ping Google Public DNS at or Level 3 Communications at

IPv6 Failure Check (Advanced)

The settings for IPv6 Failure Check match those for IPv4 Failure Check except that the IP address for Active Ping is an IPv6 address.

Failback Configuration (Advanced)

This is used to configure failback, which is the ability to go back to a higher priority WAN interface if it regains connection to its network.

Select the Failback Mode from the following options:

  • Usage
  • Time
  • Disabled

Usage: Fail back based on the amount of data passed over time. This is a good setting for when you have a dual-mode EVDO/WiMAX modem and you are going in and out of WiMAX coverage. If the router has failed over to EVDO it will wait until you have low data usage before bringing down the EVDO connection to check if a WiMAX connection can be made.

  • High (Rate: 80 KB/s. Time Period: 30 seconds.)
  • Normal (Rate: 20 KB/s. Time Period: 90 seconds.)
  • Low (Rate: 10 KB/s. Time Period: 240 seconds.)
  • Custom (Rate range: 1-100 KB/s. Time Period range: 10-300 seconds.)

Time: Fail back only after a set period of time. (Default: 90 seconds. Range: 10-300 seconds.) This is a good setting if you have a primary wired WAN connection and only use a modem for failover when your wired connection goes down. This ensures that the higher priority interface has remained online for a set period of time before it becomes active (in case the connection is dropping in and out, for example).

Disabled: Deactivate failback mode.

Immediate Mode: Fail back immediately whenever a higher priority interface is plugged in or when there is a priority change. Immediate failback returns you to the use of your preferred Internet source more quickly which may have advantages such as reducing the cost of a failover data plan, but it may cause more interruptions in your network than Usage or Time modes.

IP Overrides

IP overrides allow you to override IP settings after a device’s IP settings have been configured.

Only the fields that you fill out will be overridden. Override any of the following fields:

  • IP Address
  • Subnet Mask
  • Gateway IP
  • Primary DNS Server
  • Secondary DNS Server

IPv6 Settings

IPv6 is disabled by default. To learn about configuration options for IPv6, see this article.

Ethernet Settings

While default settings for each WAN Ethernet port will be sufficient in most circumstances, you have the ability to control the following:

  • Connect Method: DHCP (Automatic), Static (Manual), or PPPoE (Point-to-Point Protocol over Ethernet).
  • MAC Address: You have the ability to change the MAC address, but typically this is unnecessary. You can match this address with your device’s address by clicking: “Clone Your PC’s MAC Address”.

Connect Method

Select the connection type that you need for this WAN connection. You may need to check with your ISP or system administrator for this information.

  • DHCP (Dynamic Host Configuration Protocol) is the most common configuration. Your router’s Ethernet ports are automatically configured for DHCP connection. DHCP automatically assigns dynamic IP addresses to devices in your networks. This is preferable in most circumstances.
  • Static allows you to input a specific IP address for your WAN connection; this should be provided by the ISP if supported.
  • PPPoE should be configured with the username, password, and other settings provided by your ISP.

If you want to use a Static (Manual) or PPPoE connection, you will need to fill out additional information.

Static (Manual):

  • IPv4 Address
  • Subnet Mask
  • Gateway IP
  • Primary DNS Server
  • Secondary DNS Server


  • Username
  • Password
  • Password Confirm
  • Service
  • Auth Type: None, PAP, or CHAP

Modem Settings

Not all modems will have all of the options shown below; the available options are specific to the modem type.

On Demand: When this mode is selected a connection to the Internet is made as needed. When this mode is not selected a connection to the Internet is always maintained.

IP WAN Subnet Filter: This feature will filter out any packets going to the modem that do not match the network (address and netmask).

Aggressive Reset: When Aggressive Reset is enabled the system will attempt to maintain a good modem connection. If the Internet has been unreachable for a period of time, a reset of the modem will occur in attempt to re-establish the connection.

Automatically check for new firmware: (Default: selected) The modem will automatically check for firmware updates by default.

Enable Aux Antenna: (Default: selected) Enable or disable the modem’s auxiliary diversity antenna. This should normally be left enabled.

GPS Signal Source: Select the antenna to be used for receiving GPS coordinates. Some products support a dedicated GPS antenna, while others use the auxiliary diversity antenna only (and some products support both).

Enable eHRPD: (Default: selected) Enable or disable the modem’s ability to connect via eHRPD (enhanced High Rate Packet Data) when connecting to a 3G EVDO network on Sprint. eHRPD routes EVDO traffic through the LTE systems, enabling easy transitions between LTE and EVDO. In rare cases it may make sense to bypass the LTE core, so this field allows you to disable eHRPD.

Modem Connection Mode: Specify how the modem should connect to the network. Not all options are available for all modems; this will default to Auto if an incompatible mode is selected.

  • Auto (all modes): Let the modem decide which network to use.
  • Auto 3G (3G or less): Let the modem decide which 2G or 3G network to use. Do not attempt to connect to LTE.
  • Force LTE: Connect to LTE only and do not attempt to connect to 3G or WiMAX.
  • Force WiMAX: Connect to WiMAX only and do not attempt to connect tot 3G or LTE.
  • Force 3G (EVDO, UMTS, HSPA): Connect to 3G network only.
  • Force 2G (1xRTT, EDGE, GPRS): Connect to 2G network only.

Network Selection Mode: Wireless carriers are assigned unique network identifying codes known as PLMN (Public Land Mobile Network). To manually select a particular carrier, select the Manual radio button and enter the network PLMN. Choose from the following options:

  • None/No Change
  • Auto: Selected by default
  • Home only
  • Manual: Input the PLMN code

Functional Mode: Selects the functional mode of the modem. IPPT (IP passthrough) mode causes the modem to act as a transport, passing Internet data and IP address information between the modem and the Internet directly. NAT mode causes the modem to NAT the IP address information. Consequently, IPPT mode does not allow user access to the modem web UI and NAT mode does allow user access to the modem web UI.

  • None/No Change
  • IPPT
  • NAT

Network-Initiated Alerts: This field controls whether the Sprint network can disconnect the modem to apply updates, such as for PRL, modem firmware, or configuration events. These activities do not change any router settings, but the modem connection may be unavailable for periods of time while these updates occur. The modem may also require a reset after a modem firmware update is complete.

  • Disabled: The request to update will be refused.
  • When Disconnected: The request to update will only be performed when the modem is either in a disconnected state or dormant state. If the modem is not in one of these states when the request is received, then the router will remember the request and perform the update when the modem becomes disconnected/dormant.
  • On Schedule: The request to update will only be performed at the specified scheduled time, no matter what the state of the modem is.

Network-Initiated Schedule: When you select “On Schedule” for Network-Initiated Alerts, you also select a time from this dropdown list. Modem updates will take place at this scheduled time.

AT Config Script: Enter the AT commands to be used for carrier specific modem configuration settings. Each command must be entered on a separate line. The command and associated response will be logged, so you should check the system log to make sure there were no errors.

NOTE: AT Config Script should not be used unless told to do so by your modem’s cellular provider or by a support technician.

AT Dial Script: Enter the AT commands to be used in establishing a network connection. Each command must be entered on a separate line. All command responses must include “OK”, except the final command response, which must include “CONNECT”.



WiMAX Settings

WiMAX Realm: Select from the following dropdown options:

  • Clear –
  • Rover –
  • Sprint 3G/4G –
  • Xohm –
  • BridgeMAXX –
  • Time Warner Cable –
  • Comcast –

TTLS Authentication Mode: TTLS inner authentication protocol. Select from the following dropdown options:

  • MSCHAPv2/MD5 (Microsoft Challenge Handshake Authentication Protocol version2/Message-Digest Algorithm 5)
  • PAP (Password Authentication Protocol)
  • CHAP (Challenge Handshake Authentication Protocol)

TTLS Username: Username for TTLS authentication.

TTLS Password: Password for TTLS authentication.

WiMAX Authentication Identity: User ID on the network. Leave this blank unless your provider tells you otherwise.

CDMA Settings

These settings are usually specific to your wireless carrier’s private networks. You should not set these unless directed to by a carrier representative. If a field below is left blank, that particular setting will not be changed in the modem. You should only fill in fields that are required by your carrier.

  • Persist Settings: If this is not checked, these settings will only be in place until the router is rebooted or the modem is unplugged.
  • Active Profile: Select a number from 0-5 from the dropdown list.

The following fields can be left blank. If left blank they will remain unchanged in the modem.

  • NAI ([email protected]): Network Access Identifier. NAI is a standard system of identifying users who attempt to connect to a network.
  • AAA Shared Secret (Password): “Authentication, Authorization, and Accounting” password.
  • Verify AAA Shared Secret
  • HA Shared Secret: “Home Agent” shared secret.
  • Primary HA
  • Secondary HA
  • AAA SPI: AAA Security Parameter Index.
  • HA SPI: HA Security Parameter Index.

SIM/APN/Auth Settings

SIM PIN: PIN number for a GSM modem with a locked SIM.

Authentication Protocol: Set this only if your service provider requires a specific protocol and the Auto option chooses the wrong one. Choose from AutoPAP, and CHAP and then input your username and password.

Access Point Configuration: Some wireless carriers provide multiple Access Point configurations that a modem can connect to. Some APN examples are ‘isp.cingular” and “”.

  • Default: Let the router choose an APN automatically.
  • Default Override: Enter an APN by hand.
  • Select: This opens a table with 16 slots for APNs, each of which can be set as IP, IPV4V6, or IPV6. The default APN is marked with an asterisk (*). You can change the APN names, select a different APN, etc. For Verizon modems, only the third slot is editable. Changes made here are written to the modem, so a factory reset of the router will not impact these settings.

Update/Activate a Modem

Some 3G/4G modems can be updated and activated while plugged into the router. Updates and activation methods vary by modem model and service provider. Possible methods are: PRL Update, Activation, and FUMO. All supported methods will be displayed when you select your modem and click “Control” to open the “Update/Activate” window. If no methods are displayed for your device then you will need to update and activate your device externally.

To update or activate a modem, select the modem in the WAN Interfaces table and click “Control”.

The modem does not support Update/Activate methods: A message will state that there is no support for PRL Update, Activation, or FUMO.

The modem supports Update/Activate methods: A message will display showing options for each supported method:

  • Modem Activation / Update: Activate, Reactivate, or Upgrade Configuration.
  • Preferred Roaming List (PRL) Update
  • Firmware Update Management Object (FUMO)

Click the appropriate icon to start the process.

If the modem is connected when you start an operation the router will automatically disconnect it. The router may start another modem as a failover measure. When the operation is done the modem will go back to an idle state, at which point the router may restart it depending on failover and failback settings.

NOTE: Only one operation is supported at a time. If you try to start the same operation on the same modem twice the UI will not report failure and the request will finish normally when the original request is done. However if you try to start a different operation or use a different modem, this second request will fail without interfering with the pending operation.

Process Timeout: If the process fails an error message will display.

Activation has a 3-minute timeout, PRL update has a 4-minute timeout, and FUMO has a 10-minute timeout.

Update Modem Firmware

Click on the Firmware button to open the Modem Firmware Upgrade window. This will show whether there is new modem firmware available.

If you select Automatic (Internet) the firmware will be updated automatically. Use Manual Firmware Upgrade to instead manually upload firmware from a local computer or device.

Reset the Modem

Click on the Reset button to power cycle the modem. This will have the same effect as unplugging the modem.

Configuration Rules (Advanced)

This section allows you to create general rules that apply to the Internet connections of a particular type. These can be general or very specific. For example, you could create a rule that applies to all 3G/4G modems, or a rule that only applies to an Internet source with a particular MAC address.

The Configuration Rules list shows all rules that you have created, as well as all of the default rules. These are listed in the order they will be applied. The most general rules are listed at the top, and the most specific rules are at the bottom. The router goes down the list and applies all rules that fit for attached Internet sources. Configuration settings farther down the list will override previous settings.

Select any of these rules and click “Edit” to change the settings for a rule. To create a new rule, click “Add.”

WAN Configuration Rule Editor

After clicking “Add” or “Edit,” you will see a popup with the following tabs:

  • Filter Criteria
  • General Settings
  • IP Overrides
  • IPv6 Settings
  • Ethernet Settings
  • Modem Settings
  • WiMAX Settings
  • CDMA Settings
  • SIM/APN/Auth Settings

Filter Criteria

If you are creating a new rule, begin by setting the Filter Criteria . Create a name for your rule and the condition for which the rule applies:

  • Rule Name: Create a name meaningful to you. This name is optional.

Make a selection for “When,” “Condition,” and “Value” to create a condition for your rule. The condition will be in the form of these examples:

PortisUSB Port 1
Typeis notWiMAX
  • When:
    • Port – Select by the physical port on the router that you are plugging the modem into (e.g., “USB Port 2”).
    • Manufacturer – Select by the modem manufacturer, such as Sierra Wireless.
    • Model – Set your rule according to the specific model of modem.
    • Type – Select by type of Internet source (Ethernet, LTE, Modem, Wireless as WAN, WiMAX).
    • Serial Number – Select 3G or LTE modem by the serial number.
    • MAC Address – Select WiMAX modem by MAC Address.
    • Unique ID – Select by ID. This is generated by the router and displayed when the device is connected to the router.
  • Condition: Select “is,” “is not,” “starts with,” “contains,” or “ends with” to create your condition’s statement.
  • Value: If the correct values are available, select from the dropdown list. You may need to manually input the value.

Once you have established the condition for your configuration rule, choose from the other tabs to set the desired configuration. All of the tabs have the same configuration options shown above in the WAN Configuration section (i.e., the options for Configuration Rules are the same as they are for individual devices).

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