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authorJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:59:05 -0400
committerJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:59:05 -0400
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-<table class="head">
- <tr>
- <td class="head-ltitle">CDCEEM(4)</td>
- <td class="head-vol">Device Drivers Manual</td>
- <td class="head-rtitle">CDCEEM(4)</td>
- </tr>
-</table>
-<div class="manual-text">
-<section class="Sh">
-<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
-<p class="Pp"><code class="Nm">cdceem</code> &#x2014; <span class="Nd">USB
- Communication Device Class Ethernet Emulation Model driver</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
-<p class="Pp">To compile this driver into the kernel, place the following lines
- in your kernel configuration file:</p>
-<div class="Bd Pp Bd-indent"><code class="Cd">device uhci</code>
-<br/>
-<code class="Cd">device ohci</code>
-<br/>
-<code class="Cd">device usb</code>
-<br/>
-<code class="Cd">device miibus</code>
-<br/>
-<code class="Cd">device uether</code>
-<br/>
-<code class="Cd">device cdceem</code></div>
-<p class="Pp">Alternatively, to load the driver as a module at boot time, place
- the following line in <a class="Xr">loader.conf(5)</a>:</p>
-<div class="Bd Pp Bd-indent Li">
-<pre>if_cdceem_load=&quot;YES&quot;</pre>
-</div>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">The <code class="Nm">cdceem</code> driver provides support for USB
- devices based on the USB Communication Device Class Ethernet Emulation Model
- (CDC EEM) specification.</p>
-<p class="Pp">The driver works on both host, and device-side; see
- <a class="Xr">usb_template(4)</a> for details.</p>
-<p class="Pp">The USB device appears as a regular network interface on both
- sides, transporting Ethernet frames.</p>
-<p class="Pp">For more information on configuring this device, see
- <a class="Xr">ifconfig(8)</a>.</p>
-<p class="Pp">The <code class="Nm">cdceem</code> driver does not support
- different media types or options.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYSCTL_VARIABLES"><a class="permalink" href="#SYSCTL_VARIABLES">SYSCTL
- VARIABLES</a></h1>
-<p class="Pp">The following variables are available as both
- <a class="Xr">sysctl(8)</a> variables and <a class="Xr">loader(8)</a>
- tunables:</p>
-<dl class="Bl-tag">
- <dt id="hw.usb.cdceem.debug"><var class="Va">hw.usb.cdceem.debug</var></dt>
- <dd>Verbosity level for log messages from the <code class="Nm">cdceem</code>
- driver. Set to 0 to disable logging or 1 to warn about potential problems.
- Larger values enable debugging output. Defaults to 1.</dd>
- <dt id="hw.usb.cdceem.send_echoes"><var class="Va">hw.usb.cdceem.send_echoes</var></dt>
- <dd>If set to 1, the driver will send an Echo EEM packet when the interface is
- brought up. While responding to Echo is mandatory, some devices cannot
- handle it. Only use for debugging. Defaults to 0.</dd>
- <dt id="hw.usb.cdceem.send_fake_crc"><var class="Va">hw.usb.cdceem.send_fake_crc</var></dt>
- <dd>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.</dd>
-</dl>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
- ALSO</a></h1>
-<p class="Pp"><a class="Xr">arp(4)</a>, <a class="Xr">cdce(4)</a>,
- <a class="Xr">intro(4)</a>, <a class="Xr">ipheth(4)</a>,
- <a class="Xr">netintro(4)</a>, <a class="Xr">urndis(4)</a>,
- <a class="Xr">usb(4)</a>, <a class="Xr">usb_template(4)</a>,
- <a class="Xr">ifconfig(8)</a></p>
-<p class="Pp"><cite class="Rs"><span class="RsT">Universal Serial Bus
- Communications Class Subclass Specification for Ethernet Emulation Model
- Devices</span>,
- <a class="RsU" href="https://usb.org/sites/default/files/CDC_EEM10.pdf">https://usb.org/sites/default/files/CDC_EEM10.pdf</a>.</cite></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
-<p class="Pp">The <code class="Nm">cdceem</code> device driver first appeared in
- <span class="Ux">FreeBSD 12.1</span>.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
-<p class="Pp">The <code class="Nm">cdceem</code> driver was written by
- <span class="An">Edward Tomasz Napierala</span>
- &lt;<a class="Mt" href="mailto:trasz@FreeBSD.org">trasz@FreeBSD.org</a>&gt;
- under sponsorship from Hewlett Packard Enterprise.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">September 18, 2025</td>
- <td class="foot-os">FreeBSD 15.0</td>
- </tr>
-</table>