The Austrian discount market Hofer and it’s mobile brand Hofer Telekom (HoT) started to sell a ZTE MF833V broadband usb modem, yesterday.
It is the successor of the MF831 and features a LTE Cat4 device in CDC mode. It was specified for GSM 850/900 @35dBm, GSM 1800/1900 @ 32 dBm, UMTS I/VIII @28dBm and LTE 3/7/8/20 @25dBm.
As opposed to the „mini“ SIM form factor, it is equipped with „micro“ SIM card slot.
When plugging the stick into an USB port of my computer, lsusb reports:
Bus 001 Device 074: ID 19d2:1225 ZTE WCDMA Technologies MSM
which is beeing switched to
Bus 001 Device 075: ID 19d2:1405 ZTE WCDMA Technologies MSM
dmesg reports, MAC partially censored here:
[645228.134041] usb 1-2: new high-speed USB device number 74 using xhci_hcd
[645228.294170] usb 1-2: New USB device found, idVendor=19d2, idProduct=1225, bcdDevice=56.91
[645228.294172] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[645228.294173] usb 1-2: Product: ZTE Mobile Broadband
[645228.294174] usb 1-2: Manufacturer: ZTE,Incorporated
[645228.294175] usb 1-2: SerialNumber: 1234567890ABCDEF
[645228.298872] usb-storage 1-2:1.0: USB Mass Storage device detected
[645228.298993] usb-storage 1-2:1.0: Quirks match for vid 19d2 pid 1225: 1
[645228.299069] scsi host3: usb-storage 1-2:1.0
[645229.318504] scsi 3:0:0:0: CD-ROM ZTE USB SCSI CD-ROM 2.31 PQ: 0 ANSI: 2
[645229.321200] sr 3:0:0:0: Power-on or device reset occurred
[645229.328269] sr 3:0:0:0: [sr0] scsi-1 drive
[645229.328455] sr 3:0:0:0: Attached scsi CD-ROM sr0
[645229.328522] sr 3:0:0:0: Attached scsi generic sg1 type 5
[645234.323025] usb 1-2: USB disconnect, device number 74
[645234.669842] usb 1-2: new high-speed USB device number 75 using xhci_hcd
[645234.829914] usb 1-2: New USB device found, idVendor=19d2, idProduct=1405, bcdDevice=56.91
[645234.829916] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[645234.829917] usb 1-2: Product: ZTE Mobile Broadband
[645234.829918] usb 1-2: Manufacturer: ZTE,Incorporated
[645234.829919] usb 1-2: SerialNumber: 1234567890ABCDEF
[645234.838214] cdc_ether 1-2:1.0 usb0: register ‘cdc_ether’ at usb-0000:00:14.0-2, ZTE CDC Ethernet Device, 0e:84:5a:xx:xx:xx
[645234.840017] usb-storage 1-2:1.2: USB Mass Storage device detected
[645234.840159] scsi host3: usb-storage 1-2:1.2
[645235.848009] scsi 3:0:0:0: CD-ROM ZTE USB SCSI CD-ROM 2.31 PQ: 0 ANSI: 2
[645235.849927] scsi 3:0:0:1: Direct-Access ZTE MMC Storage 2.31 PQ: 0 ANSI: 2
[645235.857944] sr 3:0:0:0: [sr0] scsi-1 drive
[645235.858179] sr 3:0:0:0: Attached scsi CD-ROM sr0
[645235.858260] sr 3:0:0:0: Attached scsi generic sg1 type 5
[645235.858417] sd 3:0:0:1: Attached scsi generic sg2 type 0
[645235.864894] sd 3:0:0:1: Power-on or device reset occurred[645235.875941] sd 3:0:0:1: [sdb] Attached SCSI removable disk
As usual, DHCP is enabled per default – ifconfig shows (partially censored)
usb0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.0.145 netmask 255.255.255.0 broadcast 192.168.0.255
inet6 fe80::e540:9fc0:2exx:xxxx prefixlen 64 scopeid 0x20<link>
ether 92:0d:ef:xx:xx:xx txqueuelen 1000 (Ethernet)
RX packets 27 bytes 2637 (2.6 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 52 bytes 7333 (7.3 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
ip route gives a default route in lower metric – that’s fine:
default via 192.168.0.1 dev usb0 proto dhcp metric 20100
The well known browser based and URI triggered modeswitch commands, that allowed the MF831 to be switched to modem mode, do not work on this model.
You won’t need that anyway: The Web interface has DMZ settings (but no port porward as the MF920 e.g.). The settings for DHCP can easily be adapted, too.
As long as your router understands to handle CDC mode LTE-Sticks there should be no problem. If your router uses 192.168.0.1 as it’s default address, you are advised to change either that or the modems default IP before using both together.
The model, I have held in my hands does not support IPv6!
Nice: you can adapt MTU and MSS sizes from the GUI!
A very cheap LTE Class 4 USB modem (30 Euro) with hardware from the year 2017, it’s software carries a copyright notice from 2019. It is easy to handle, but it’s size, which is similar to the MF831 will probably block a neighbored USB port, physically. Better get an extension cable.
If you need a device, which is capable of IPv6 natively, if your ISP/mobile service provider does likewise, this stick is not for you. There simply is no sign of support for IPv6 anywhere in the software. DMZ features may allow you to use an external IP address, which is a most likely necessity for using 6in4 based IPv6 tunnel broker services today (6to4 and Teredo are almost no longer used for having severe disadvantages), if your MSP/ISP provides a public IP with your contract.