This guide will show you how to configure the Vigor2120 router to enable 4G communication via an attached 4G USB modem. The 4G modems that this guide will apply to are:

  1. Optus – Huawei E3276 4G USB modem
  2. Telstra Prepaid – ZTE MF823 4G USB modem (use Vigor2120 firmware version

(Vodafone prepaid – K5150 4G USB modem currently not supported)

In the Vigor2120 the USB modem will only run in Backup mode.

Step 1 – Enable USB WAN port

Go to WAN >> General Setup configuration menu.

Select Yes for Enable option.

The Active Mode will always be set to be Backup.

Click on OK to save.

The router will require a reboot. Click OK to reboot using the current configuration.


Step 2 – Enable USB WAN port


For WAN2 click on the pulldown menu and select 3G/4G USB Modem(DHCP mode).


Then click on Details Page to configure WAN2

Details Page Setup

Select Enable to activate this profile.

Select the required Network Mode. Options are:

  • 4G/3G/2G
  • 4G Only
  • 3G Only
  • 2G Only

We have selected the default setting 4G/3G/2G Network Mode.

Now enter the APN Name to correspond to the 4G modem being used and the ISP that you will be connecting to.


2.1 Optus 4G Configuration (Huawei E3276)

Enter the APN Name:    connect

Click OK to save.


2.2 Telstra 4G Configuration (ZTE MF823)

Enter the APN Name:    Telstra.internet

Click OK to save.

Step 3 – Establishing 4G connection

Plug in your 4G modem into the USB port on the router.

Go to Online Status>> Physical Connection router menu and check if the 4G connection is up.

Details will be shown under WAN USB Modem Status.

You should see a valid IP address and USB modem status will be Operational and signal quality shown.

Check that you have Internet connectivity by going to an Internet web page or run ping to an external site.