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UMB(4) Device Drivers Manual UMB(4)

umbUSB Mobile Broadband Interface Model (MBIM)

umb* at uhub?

The umb driver provides support for USB MBIM devices.

MBIM devices establish connections via cellular networks such as GPRS, UMTS, and LTE. They appear as a regular point-to-point network interface, transporting raw IP frames. Once a connection is established, the device will automatically set an IP address and send out a nameserver proposal, which resolvd(8) can act on.

Required configuration parameters like PIN and APN have to be set with ifconfig(8). Once the SIM card has been unlocked with the correct PIN, it will remain in this state until the MBIM device is power-cycled. In case the device is connected to an "always-on" USB port, it may be possible to connect to a provider without entering the PIN again even if the system was rebooted.

The following devices should work:

Dell DW5821e
Ericsson H5321gw and N5321gw
Fibocom L831-EAU
Medion Mobile S4222 (MediaTek OEM)
Quectel EC25
Quectel EM060K
Quectel RM500Q
SIMCom SIM7600
SIMCom SIM8262E-M2
Sierra Wireless EM7345
Sierra Wireless EM7455
Sierra Wireless EM8805
Sierra Wireless MC8305

The following hostname.if(5) example configures umb0 to set the APN to “internet”, enabling data roaming, and obtaining an IP address using IPv6 stateless address autoconfiguration:

pin 1234
apn internet
inet6 autoconf

intro(4), netintro(4), usb(4), hostname.if(5), ifconfig(8), route(8)

Universal Serial Bus Communications Class Subclass Specification for Mobile Broadband Interface Model,

Devices which fail to provide a conforming MBIM implementation will probably be attached as some other driver, such as umsm(4).

May 23, 2024 OpenBSD-current