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.Dd August 1, 2018 .Dt UMB 4 .Os .Sh NAME .Nm umb .Nd USB Mobile Broadband Interface Model (MBIM) .Sh SYNOPSIS .Cd "umb* at uhub? port?" .Sh DESCRIPTION The .Nm driver provides support for USB MBIM devices.
p 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.
p Required configuration parameters like PIN and APN have to be set with .Xr umbctl 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. .Sh HARDWARE The following devices should work:
p
l -tag -width Ds -offset indent -compact t Ericsson H5321gw and N5321gw t Fibocom L831-EAU t Medion Mobile S4222 (MediaTek OEM) t Sierra Wireless EM7345 t Sierra Wireless EM7455 t Sierra Wireless EM8805 t Sierra Wireless MC8305 .El
.Sh SEE ALSO
.Xr intro 4 ,
.Xr netintro 4 ,
.Xr usb 4 ,
.Xr hostname.if 5 ,
.Xr ifconfig 8 ,
.Xr umbctl 8
.Rs
.%T "Universal Serial Bus Communications Class Subclass Specification for Mobile Broadband Interface Model"
.%U http://www.usb.org/developers/docs/devclass_docs/MBIM10Errata1_073013.zip
.Re
.Sh HISTORY
The
.Nm
device driver first appeared in
.Ox 6.0
and
.Nx 9.0 .
.Sh AUTHORS
.An -nosplit
The
.Nm
driver was written by
.An Gerhard Roth Aq Mt gerhard (at] openbsd.org
and ported from
.Ox
by
.An Pierre Pronchery Aq Mt khorben (at] defora.org .
.Sh CAVEATS
The
.Nm
driver does not support IPv6.
p Devices which fail to provide a conforming MBIM implementation will probably be attached as some other driver, such as .Xr u3g 4 .
Indexes created Sat Oct 18 08:10:09 GMT 2025