Mobile Networking


OPNsense supports 3G and 4G (LTE) cellular modems as failsafe or primary WAN interface. Both USB and (mini)PCIe cards are supported.

Supported Devices

While all devices supported by HardenedBSD will likely function under OPNsense their configuration depends on a AT command string that can differ from device to device. To make thing easier some of these strings are part of a easy selectable profile.

Tested devices by the OPNsense team include:

  • Huawei ME909u-521 (device cuaUx.0)
  • Huawei E220 (device cuaUx.0)
  • Sierra Wireless MC7304 (device cuaUx.2) [as of OPNsense 16.7]


If you have tested a cellular modem that is not on this list, but does work then please report it to the project so we can list it and inform others.

Configure Cellular modems

Setting up and configuring a cellular modem is easy, see: Configuring Cellular Modems

3G - 4G Cellular Failover

To setup Cellular Failover, just follow these two how-tos:

  1. Configuring Cellular Modems
  2. Gateway-groups


Treat the cellular connection the same as a normal WAN connection.