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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">UDBP(4)</td>
- <td class="head-vol">Device Drivers Manual</td>
- <td class="head-rtitle">UDBP(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">udbp</code> &#x2014; <span class="Nd">USB Double
- Bulk Pipe 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 line
- in your kernel configuration file:</p>
-<div class="Bd Pp Bd-indent"><code class="Cd">device udbp</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>udbp_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">udbp</code> driver provides support for
- host-to-host cables that contain at least two bulk pipes (one for each
- direction). This typically includes cables branded for use with
- <a class="permalink" href="#Windows"><b class="Sy" id="Windows">Windows USB
- Easy Transfer</b></a>, and many cables based on the Prolific PL2xx1 series
- of USB bridge chips. A useful (but non-comprehensive) list of compatible USB
- host cables is listed in the <a class="Sx" href="#SEE_ALSO">SEE ALSO</a>
- section below.</p>
-<p class="Pp">It requires <a class="Xr">netgraph(4)</a> to be available. This
- can be done either by adding <code class="Cd">options NETGRAPH</code> to
- your kernel configuration file, or alternatively loading
- <a class="Xr">netgraph(4)</a> as a module, either from
- <span class="Pa">/boot/loader.conf</span> or from the command line, before
- the <code class="Nm">udbp</code> module.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="EXAMPLES"><a class="permalink" href="#EXAMPLES">EXAMPLES</a></h1>
-<div class="Bd Bd-indent"><code class="Li">options NETGRAPH</code></div>
-<div class="Bd Bd-indent"><code class="Li">device udbp</code></div>
-<p class="Pp">Add the <code class="Nm">udbp</code> driver to the kernel.</p>
-<p class="Pp"></p>
-<div class="Bd Bd-indent"><code class="Li">kldload netgraph</code></div>
-<div class="Bd Bd-indent"><code class="Li">kldload udbp</code></div>
-<p class="Pp">Load the <a class="Xr">netgraph(4)</a> module and then the
- <code class="Nm">udbp</code> driver.</p>
-<p class="Pp"></p>
-<div class="Bd Bd-indent"><code class="Li">ngctl mkpeer udbp0: eiface data
- ether</code></div>
-<div class="Bd Bd-indent"><code class="Li">ifconfig ngeth0 ether
- aa:dd:xx:xx:xx</code></div>
-<div class="Bd Bd-indent"><code class="Li">ifconfig ngeth0 inet
- 169.254.x.x/16</code></div>
-<p class="Pp">Create a new Ethernet network interface node and connect its ether
- hook to the data hook of the <code class="Nm">udbp</code> driver.</p>
-<p class="Pp" id="plusb">This enables FreeBSD to communicate with a Linux peer
- (e.g. using the
- <a class="permalink" href="#plusb"><b class="Sy">plusb</b></a> driver). The
- Linux node should be configured to prefer link-local IPv4 addresses (e.g.
- using Network Manager in Debian and Red Hat derived distributions).</p>
-<p class="Pp">Whilst both FreeBSD and Linux are able to interoperate by loosely
- following CDC EEM 1.0 in their behaviour, neither implementation has been
- expressly designed to follow its specification.</p>
-</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">netgraph(4)</a>, <a class="Xr">ng_eiface(4)</a>,
- <a class="Xr">ohci(4)</a>, <a class="Xr">uhci(4)</a>,
- <a class="Xr">usb(4)</a>, <a class="Xr">ngctl(8)</a></p>
-<p class="Pp"><cite class="Rs"><i class="RsB">Universal Serial Bus:
- Communications Class Subclass Specification for Ethernet Emulation Model
- Devices</i>, <i class="RsI">USB Implementers Forum, Inc.</i>,
- <span class="RsN">Revision 1.0</span>,
- <a class="RsU" href="http://www.usb.org/developers/docs/devclass_docs/CDC_EEM10.pdf">http://www.usb.org/developers/docs/devclass_docs/CDC_EEM10.pdf</a>,
- <span class="RsD">February 2, 2005</span>.</cite></p>
-<p class="Pp"><cite class="Rs"><i class="RsB">Total Commander: Supported cables
- for USB cable connection</i>, <i class="RsI">Ghisler Software GmbH.</i>,
- <a class="RsU" href="https://www.ghisler.com/cables/index.htm">https://www.ghisler.com/cables/index.htm</a>.</cite></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="CAVEATS"><a class="permalink" href="#CAVEATS">CAVEATS</a></h1>
-<p class="Pp">The point-to-point nature and additional latency of USB host-host
- links makes them unsuitable as a &quot;drop-in&quot; replacement for an
- Ethernet LAN; for a USB 3.0 SuperSpeed cable, latency is comparable to
- 100BaseTX Ethernet (but often worse), with throughput comparable to
- 2.5GBASE-T.</p>
-<p class="Pp">However, their energy efficiency makes them attractive for
- embedded applications. A Plugable PL27A1 cable claims 24mA of USB3 bus
- power, as compared to 150mA for a typical USB 3.0 to Gigabit Ethernet
- interface.</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">udbp</code> driver first appeared in
- <span class="Ux">FreeBSD 5.0</span>.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="BUGS"><a class="permalink" href="#BUGS">BUGS</a></h1>
-<p class="Pp">The <code class="Nm">udbp</code> driver does not support the
- special packets described in section 5.1 of the CDC EEM specification.</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">udbp</code> driver was written by
- <span class="An">Doug Ambrisko</span>
- &lt;<a class="Mt" href="mailto:ambrisko@whistle.com">ambrisko@whistle.com</a>&gt;,
- <span class="An">Julian Elischer</span>
- &lt;<a class="Mt" href="mailto:julian@FreeBSD.org">julian@FreeBSD.org</a>&gt;
- and <span class="An">Nick Hibma</span>
- &lt;<a class="Mt" href="mailto:n_hibma@FreeBSD.org">n_hibma@FreeBSD.org</a>&gt;.</p>
-<p class="Pp">This manual page was written by <span class="An">Nick Hibma</span>
- &lt;<a class="Mt" href="mailto:n_hibma@FreeBSD.org">n_hibma@FreeBSD.org</a>&gt;
- and updated by <span class="An">Bruce Simpson</span>
- &lt;<a class="Mt" href="mailto:bms@FreeBSD.org">bms@FreeBSD.org</a>&gt;.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">October 20, 2017</td>
- <td class="foot-os">FreeBSD 15.0</td>
- </tr>
-</table>