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-<table class="head">
- <tr>
- <td class="head-ltitle">NG_GIF(4)</td>
- <td class="head-vol">Device Drivers Manual</td>
- <td class="head-rtitle">NG_GIF(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">ng_gif</code> &#x2014; <span class="Nd">generic
- tunnel interface netgraph node type</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
-<p class="Pp"><code class="In">#include
- &lt;<a class="In">netgraph/ng_gif.h</a>&gt;</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">ng_gif</code> netgraph node type allows
- <a class="Xr">gif(4)</a> interfaces to interact with the
- <a class="Xr">netgraph(4)</a> networking subsystem. Once the
- <code class="Nm">ng_gif</code> module is loaded in the kernel, a node is
- automatically created for each <a class="Xr">gif(4)</a> interface in the
- system. Each node will attempt to name itself with the same name as the
- associated interface. All <code class="Nm">ng_gif</code> nodes are
- persistent for as long as the interface itself exists.</p>
-<p class="Pp">Two hooks are supported: <code class="Dv">lower</code> and
- <code class="Dv">orphans</code>. The hook name
- <code class="Dv">divert</code> may be used as an alias for
- <code class="Dv">lower</code>, and is provided for compatibility with
- <a class="Xr">ng_ether(4)</a>. In reality the two names represent the same
- hook.</p>
-<p class="Pp">The <code class="Dv">lower</code> hook is a connection to the raw
- <a class="Xr">gif(4)</a> device. When connected, all incoming packets are
- diverted out this hook. Writing to this hook results in a raw encapsulated
- packet being transmitted by the device. Normal outgoing packets are not
- affected by <code class="Dv">lower</code> being connected.</p>
-<p class="Pp">The <code class="Dv">orphans</code> hook is equivalent to
- <code class="Dv">lower</code>, except that only unrecognized packets (that
- would otherwise be discarded) are written to the hook, and normal incoming
- traffic is unaffected. At most one of <code class="Dv">orphans</code> and
- <code class="Dv">lower</code> may be connected at any time.</p>
-<p class="Pp">In all cases, frames are raw packets with the address family of
- the packet attached to the front.</p>
-<p class="Pp">When no hooks are connected, packets flow normally upwards and
- downwards.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="HOOKS"><a class="permalink" href="#HOOKS">HOOKS</a></h1>
-<p class="Pp">This node type supports the following hooks:</p>
-<dl class="Bl-tag">
- <dt id="lower"><var class="Va">lower</var></dt>
- <dd>Connection to the lower device link layer.</dd>
- <dt id="orphans"><var class="Va">orphans</var></dt>
- <dd>Like <code class="Dv">lower</code>, but only receives unrecognized
- packets.</dd>
-</dl>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="CONTROL_MESSAGES"><a class="permalink" href="#CONTROL_MESSAGES">CONTROL
- MESSAGES</a></h1>
-<p class="Pp">This node type supports only the generic control messages.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="EXAMPLES"><a class="permalink" href="#EXAMPLES">EXAMPLES</a></h1>
-<p class="Pp">This command dumps all unrecognized packets received by the
- <code class="Li">gif0</code> interface to standard output decoded in hex and
- ASCII:</p>
-<p class="Pp"></p>
-<div class="Bd Bd-indent"><code class="Li">nghook -a gif0: orphans</code></div>
-</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">gif(4)</a>, <a class="Xr">netgraph(4)</a>,
- <a class="Xr">netintro(4)</a>, <a class="Xr">ifconfig(8)</a>,
- <a class="Xr">ngctl(8)</a>, <a class="Xr">nghook(8)</a></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
-<p class="Pp"><span class="An">Brooks Davis</span>
- &lt;<a class="Mt" href="mailto:brooks@FreeBSD.org">brooks@FreeBSD.org</a>&gt;</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">September 18, 2001</td>
- <td class="foot-os">FreeBSD 15.0</td>
- </tr>
-</table>