FireBrick 2700 with 4G ZTE MF823

A factory default FireBrick configuration will work with a ZTE MF823 dongle without any additional configuration

• The FireBrick will DHCP an address in the 192.168.0.x range from the ZTE dongle
• You can access the dongle's web interface via http:192.168.0.1
• There will be NAT performed by the FireBrick and then again by the dongle

Changing the ZTE MF823 to 'modem' mode

Warning: This is still in progress and does not work

The ZTE823 works as an Ethernet device by default, it is possible to change the mode so that it works as a modem. The idea here is that rather than the dongle NATing the connection it can be a modem and the FireBrick will be given the public WAN IP address directly.

Switching to Modem Mode

1. Disable auto-connect
   • Go to http://192.168.0.1
   • Click on Home
   • Click Disconnect
   • Click Settings
   • Click Network settings
   • Click Dial-up settings
   • Click the radio button labeled 'Manual'
2. Put the Dongle into download mode:
   • In your browser, go to: http://192.168.0.1/goform/goform_process?goformId=MODE_SWITCH&switchCmd=FACTORY

Switching to Ethernet mode

To put the dongle back to Ethernet mode you will need to connect the dongle to a computer in order to send it some commands via a serial terminal

1. Open gtkserial or another serial terminal (or simply echo the following AT commands to /dev/ttyUSB2):

ATZ
AT&F
AT+ZCDRUN=9
AT+ZCDRUN=F 

Disconnect the modem from the computer and reconnect it to the FireBrick