Mention USB tethering and include the name of the drivers which are required.

Reviewed by:	nox

en_US.ISO8859-1/books/handbook/advanced-networking/chapter.xml

@@ -20,6 +20,10 @@
 	<para>The basics of gateways and routes.</para>
       </listitem>
 
+      <listitem>
+	<para>How to set up USB tethering.</para>
+      </listitem>
+
       <listitem>
 	<para>How to set up &ieee; 802.11 and &bluetooth;
 	  devices.</para>
@@ -2202,6 +2206,31 @@ freebsdap       00:11:95:c3:0d:ac    1   54M 22:1   100 EPS</screen>
     </sect2>
   </sect1>
 
+  <sect1 xml:id="network-usb-tethering">
+    <info>
+      <title>USB Tethering</title>
+    </info>
+
+    <indexterm><primary>tether</primary></indexterm>
+
+    <para>Many cellphones provide the option to share their data
+      connection over USB (often called "tethering").  This feature
+      uses the <acronym>RNDIS</acronym> or <acronym>CDC</acronym>
+      protocol.</para>
+
+    <para>Before attaching a device, load the appropriate driver
+      into the kernel:</para>
+
+    <screen>&prompt.root; <userinput>kldload if_urndis
+&prompt.root; kldload cdce</userinput></screen>
+
+    <para>Once the device is attached
+      <literal>ue</literal><replaceable>0</replaceable> will be
+      available for use like a normal network device.  Be sure that
+      the <quote>USB tethering</quote> option is enabled on the
+      device.</para>
+  </sect1>
+
   <sect1 xml:id="network-bluetooth">
     <info><title>Bluetooth</title>
       <authorgroup>