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<table class="head">
<tr>
<td class="head-ltitle">EDSC(4)</td>
<td class="head-vol">Device Drivers Manual</td>
<td class="head-rtitle">EDSC(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">edsc</code> — <span class="Nd">Ethernet
discard 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 edsc</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">edsc</code> interface is a software discard
mechanism which may be used for performance analysis and software testing.
It imitates an Ethernet device, which allows for its use in conjunction with
such drivers as <a class="Xr">if_bridge(4)</a> and
<a class="Xr">vlan(4)</a>.</p>
<p class="Pp">As with other network interfaces, an <code class="Nm">edsc</code>
interface must have network addresses assigned for each address family with
which it is to be used. These addresses may be set or changed with the
<code class="Dv">SIOCSIFADDR</code> <a class="Xr">ioctl(2)</a> or
<a class="Xr">ifconfig(8)</a> utility.</p>
<p class="Pp">Each <code class="Nm">edsc</code> interface is created at runtime
using interface cloning. This is most easily done with the
<a class="Xr">ifconfig(8)</a> <code class="Cm">create</code> command or
using the <var class="Va">cloned_interfaces</var> variable in
<a class="Xr">rc.conf(5)</a>.</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">ioctl(2)</a>, <a class="Xr">arp(4)</a>,
<a class="Xr">if_bridge(4)</a>, <a class="Xr">inet(4)</a>,
<a class="Xr">intro(4)</a>, <a class="Xr">vlan(4)</a>,
<a class="Xr">rc.conf(5)</a>, <a class="Xr">arp(8)</a>,
<a class="Xr">ifconfig(8)</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">edsc</code> device was derived from the
<a class="Xr">disc(4)</a> device and first appeared in
<span class="Ux">FreeBSD 6.3</span>. This manpage was adapted from
<a class="Xr">disc(4)</a>.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="CAVEATS"><a class="permalink" href="#CAVEATS">CAVEATS</a></h1>
<p class="Pp">Since outgoing packets are just discarded by
<code class="Nm">edsc</code>, ARP requests stay unreplied. Consequently, an
IP packet cannot be sent via <code class="Nm">edsc</code> until a static
<a class="Xr">arp(4)</a> entry is created for its next hop using
<a class="Xr">arp(8)</a>.</p>
<p class="Pp">Initially an <code class="Nm">edsc</code> interface has a zero
link level address. It can be changed with <a class="Xr">ifconfig(8)</a>
<code class="Cm">lladdr</code> if needed.</p>
</section>
</div>
<table class="foot">
<tr>
<td class="foot-date">March 25, 2007</td>
<td class="foot-os">FreeBSD 15.0</td>
</tr>
</table>
|
