The DrayTek Vigor2960, Vigor3900 and Vigor300B can be configured to use a 3G or 4G USB modem to provide an extra WAN connection for Internet access. The 3G/4G modem connection can be used for failover mode or load balance mode as well as a primary WAN internet connection.

This video shows how to configure the Vigor300B to use a Netgear 320U 4G modem running in PPP mode. The configuration will be similar to using DHCP mode for some other 4G USB modems (Optus Huawei E3276 etc).

Click here to watch this video.

This guide will show you how to configure the Vigor2960, Vigor3900 and Vigor300B router to enable 4G communication via an attached 4G USB modem. The 4G modem that this guide will apply to is:

  1. Optus – Huawei E3276 4G USB modem

In our example we will use the Vigor2960 and USB1. The configuration for 4G will be identical in the Vigor3900 and Vigor300B routers.

Note: The router will need to have firmware version 1.1.0 or later to support the 3G modem

We will configure USB1 for the 4G USB Modem

Step 1 – Configure USB Port

In the web browser (IE, Firefox, Chrome etc.) access the menu page of Vigor2960 router (default IP address is

Once you have logged in, go to “WAN>>General Setup “menu. Select the USB WAN tab.

Highlight USB1 and click on Edit.


In the USB WAN menu (Global tab); select “Enable” and select 4G DHCP for Protocol setting. You can also enter a description for this configuration.

Select 4G DHCP tab and enter the required details (Network Mode and APN name) corresponding to the ISP connecting to. In our example we are connecting to Optus 4G.

Select the required Network Mode. Options are:


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.

Optus 4G Configuration

Enter the APN Name:    connect


Click on Apply to save the settings and return to previous menu


The configuration menu should now look like this:


Step 2 – Establishing 4G connection

Plug in your 4G modem into USB1 of the router.

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

Details will be shown under USB1 Profile

You should see USB1 has a valid IP address and USB modem status will be Operational.


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