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CDCEEM(4) Kernel Interfaces Manual CDCEEM(4) NAME cdceem -- USB Communication Device Class Ethernet Emulation Model 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 Commu- nication Device Class Ethernet Emulation Model (CDC EEM) specification. The driver works on both host, and device-side; see usb_template(4) for de- tails. The USB device appears as a regular network interface on both sides, trans- porting 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 in- terface is brought up. While responding to Echo is mandatory, 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. Defaults 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 Ether- net Emulation Model Devices, https://usb.org/sites/de- fault/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 ports 15.quarterly September 18, 2025 CDCEEM(4)
NAME | SYNOPSIS | DESCRIPTION | SYSCTL VARIABLES | SEE ALSO | HISTORY | AUTHORS
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