Knowledge Base

How to Configure the 3G/LTE Interface on the ZyWALL/USG as a WAN Backup?

Scenario

This is an example of using ZyWALL/USG to configure 3G/LTE interface as a WAN backup that ensures the ZyWALL/USG provides the continuously Internet connections when the primary WAN interface is down. After configuration, it can provide additional mobile broadband WAN connectivity or a redundant link for maximum reliability.
Figure.   ZyWALL/USG with 3G/LTE Interface as a WAN Backup Example

Step

 
Set Up the 3G/LTE Interface on the ZyWALL/USG 
1. Connect a compatible mobile broadband USB device to use a cellular connection.
2. In the ZyWALL/USG, go to CONFIGURATION > Network > Interface > Cellular, the connected device will automatically display in the Cellular Interface Summary. Click Activate and then the Apply button at the bottom of this page. 
CONFIGURATION > Network > Interface > Cellular > Activate
3. The default Connectivity method is Nailed-Up. The connection should always be up after you activate the cellular interface. You can click Edit and go to the Connectivity section to clear the Nailed-Up check box to have the ZyWALL/USG to establish the connection only when there is traffic. 
CONFIGURATION > Network > Interface > Cellular > Connect
CONFIGURATION > Network > Interface > Cellular > Edit
 
Set Up the Trunk on the ZyWALL/USG 
1. In the ZyWALL/USG, go to CONFIGURATION > Network > Interface > Trunk > User Configuration > Add Trunk, configure a Name for you to identify the Trunk profile and set the Load Balancing Algorithm field to be the Weighted Round Robin. 
Add wan1 and enter 3 in the Weight column. Add wan2 and enter 2 in the Weight column. Add cellular1, change Mode to be the Passive mode, enter 1 in the Weight column. Click OK to return to the Configuration screen.
CONFIGURATION > Network > Interface > Trunk > User Configuration > Add Trunk
2. In the Configuration screen, go to Default WAN Trunk section, select User Configured Trunk and select the newly created Trunk from the list box. Click Apply.
CONFIGURATION > Network > Interface > Trunk > Default WAN Trunk > User Configured Trunk

 

Verification

1. Check the Interface Statistics when wan1 and wan2 connections are up. You can see both wan1 and wan2 Status are up, Tx B/s displays the transmission speed and Rx B/s displays the reception speed; cellular1 Status is connected but there is no traffic going through this interface.
MONITOR > Interface Status > Interface Statistics 
2. After disconnecting both wan1 and wan2, you can see both wan1 and wan2 Status are Down and no traffic goes through these two interfaces. The backup cellular1 Status is connected and all the traffic is going through this interface.
MONITOR > Interface Status > Interface Statistics 
 
What Can Go Wrong? 
If there is no traffic going through cellular interface when other interfaces are down, please make sure you have a compatible mobile broadband device installed or connected. Go to http://www.zyxel.com/support/download_landing.shtml and see the 3G Dongle Document to check the compatible mobile broadband devices. Also, make sure the cellular interface is enabled and the cellular interface has the correct user name, password, and PIN code configured with the correct casing.
 



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Question Profile

LANGUAGE:
ARTICLE ID:015539
TYPE:Application / Configuration Example
FIRMWARE:ZLD 4.13 and above
VIEWS:4695
VOTES:9
TECHNOLOGY:
MODEL:USG110,USG1100,USG1900 (view more model name)

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