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CDCEEM(4)		    Kernel Interfaces Manual		     CDCEEM(4)

NAME
       cdceem  -- USB Communication Device Class Ethernet Emulation Model (CDC
       EEM) driver

SYNOPSIS
       To compile this driver into the kernel, place the  following  lines  in
       your kernel configuration file:

	     device uhci
	     device ohci
	     device usb
	     device miibus
	     device uether
	     device cdceem

       Alternatively,  to  load	the driver as a	module at boot time, place the
       following line in loader.conf(5):

	     if_cdceem_load="YES"

DESCRIPTION
       The cdceem driver provides support for USB devices  based  on  the  USB
       Communication  Device Class Ethernet Emulation Model (CDC EEM) specifi-
       cation.

       The driver works	on both	host, and device-side; see usb_template(4) for
       details.

       The USB device appears as a regular network interface  on  both	sides,
       transporting Ethernet frames.

       For more	information on configuring this	device,	see ifconfig(8).

       The cdceem driver does not support different media types	or options.

SYSCTL VARIABLES
       The  following  variables are available as both sysctl(8) variables and
       loader(8) tunables:

       hw.usb.cdceem.debug
	       Verbosity level for log messages	from the cdceem	 driver.   Set
	       to  0 to	disable	logging	or 1 to	warn about potential problems.
	       Larger values enable debugging output.  Defaults	to 1.

       hw.usb.cdceem.send_echoes
	       If set to 1, the	driver will send an Echo EEM packet  when  the
	       interface  is  brought  up.  While responding to	Echo is	manda-
	       tory, some devices cannot handle	it.  Only use  for  debugging.
	       Defaults	to 0.

       hw.usb.cdceem.send_fake_crc
	       If  set	to  1, the driver will use 0xdeadbeef as the CRC value
	       for outgoing Data EEM packets.  Only use	 for  debugging.   De-
	       faults to 0.

SEE ALSO
       arp(4),	cdce(4),  intro(4), ipheth(4), netintro(4), urndis(4), usb(4),
       usb_template(4),	ifconfig(8)

       Universal Serial	Bus Communications Class  Subclass  Specification  for
       Ethernet		     Emulation		    Model	      Devices,
       https://usb.org/sites/default/files/CDC_EEM10.pdf.

HISTORY
       The cdceem device driver	first appeared in FreeBSD 12.1.

AUTHORS
       The  cdceem   driver   was   written   by   Edward   Tomasz   Napierala
       <trasz@FreeBSD.org> under sponsorship from Hewlett Packard Enterprise.

FreeBSD	13.2		       November	7, 2019			     CDCEEM(4)
NAME | SYNOPSIS | DESCRIPTION | SYSCTL VARIABLES | SEE ALSO | HISTORY | AUTHORS

Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=cdceem&sektion=4&manpath=FreeBSD+14.0-RELEASE+and+Ports>

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