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-<table class="head">
- <tr>
- <td class="head-ltitle">LO(4)</td>
- <td class="head-vol">Device Drivers Manual</td>
- <td class="head-rtitle">LO(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">lo</code> &#x2014; <span class="Nd">software
- loopback network interface</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
-<p class="Pp"><code class="Cd">device loop</code></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">The <code class="Nm">loop</code> interface is a software loopback
- mechanism which may be used for performance analysis, software testing,
- and/or local communication. As with other network interfaces, the loopback
- interface must have network addresses assigned for each address family with
- which it is to be used. These addresses may be set with the appropriate
- <a class="Xr">ioctl(2)</a> commands for corresponding address families. The
- loopback interface should be the last interface configured, as protocols may
- use the order of configuration as an indication of priority. The loopback
- should
- <a class="permalink" href="#never"><i class="Em" id="never">never</i></a> be
- configured first unless no hardware interfaces exist.</p>
-<p class="Pp">If the transmit checksum offload capability flag is enabled on a
- loopback interface, checksums will not be generated by IP, UDP, TCP, or SCTP
- for packets sent on the interface.</p>
-<p class="Pp">If the receive checksum offload capability flag is enabled on a
- loopback interface, checksums will not be validated by IP, UDP, TCP, or SCTP
- for packets received on the interface.</p>
-<p class="Pp">By default, both receive and transmit checksum flags will be
- enabled, in order to avoid the overhead of checksumming for local
- communication where data corruption is unlikely. If transmit checksum
- generation is disabled, then validation should also be disabled in order to
- avoid packets being dropped due to invalid checksums.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DIAGNOSTICS"><a class="permalink" href="#DIAGNOSTICS">DIAGNOSTICS</a></h1>
-<dl class="Bl-diag">
- <dt>lo%d: can't handle af%d.</dt>
- <dd>The interface was handed a message with addresses formatted in an
- unsuitable address family; the packet was dropped.</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">inet(4)</a>, <a class="Xr">intro(4)</a></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">lo</code> device appeared in
- <span class="Ux">4.2BSD</span>. The current checksum generation and
- validation avoidance policy appeared in <span class="Ux">FreeBSD
- 8.0</span>.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">June 23, 2024</td>
- <td class="foot-os">FreeBSD 15.0</td>
- </tr>
-</table>