Monthly Archives: June 2014

Changing ZTE MF823 4G modem IP address – web interface hacking

Here in Poland ZTE MF823 USB 4G modem is one of the most popular devices bundled with LTE data plans. I’ve got two of these – one from Play and the other from Plus GSM.

It’s one of those driverless modems which appear as a network interface (using cdc_ether driver under Linux) and have an embedded web server for management. This modem (?) also has a DHCP server and performs traffic routing with NAT.

Here comes my problem with the device. It assignes IP addresses from pool which collides with my home network ( and unfortunately, there is no option to change the IP address by using the web interface.

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