Changeset 37153e0 for chapter07/network.xml

Timestamp:

03/07/2006 08:25:40 PM (19 years ago)

Author:

Matthew Burgess <matthew@…>

Children:

2536b38

Parents:

98c3af0

Message:

Udev rules file update and improve the wording for module loading and persistent device naming

git-svn-id: ​http://svn.linuxfromscratch.org/LFS/branches/udev_update/BOOK@7413 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

File:

• chapter07/network.xml (modified) (1 diff)

chapter07/network.xml

@@ -24 +24 @@
   class="directory">/etc/rc.d/rc*.d</filename>).</para>
 
+  <sect2>
+    <title>Creating stable names for network interfaces</title>
+    <para>Instructions in this section are optional if you have only one
+    network card.</para>
+    
+    <para>With Udev and modular network drivers, the network interface
+    numbering is not persistent across reboots by default, because the
+    drivers are loaded in parallel and, thus, in random order.
+    For example, on a computer having two network cards made by Intel and
+    Realtek, the network card manufactured by Intel may become eth0 and the
+    Realtek card becomes eth1.  In some cases, after a reboot the cards get
+    renumbered the other way around. To avoid this, create Udev rules that
+    assign stable names to network cards based on their MAC addresses.</para>
+    
+    <para>First, find out the MAC addresses of your network cards:</para>
+<screen role="nodump"><userinput>grep -H . /sys/class/net/*/address</userinput></screen>
+    <para>For each network card (but not for the loopback interface),
+    invent a descriptive name, such as <quote>realtek</quote>, and create
+    Udev rules similar to the following:</para>
+
+<screen role="nodump"><userinput>
+cat &gt; /etc/udev/rules.d/26-network.rules &lt;&lt; "EOF"
+ACTION=="add", SUBSYSTEM=="net", SYSFS{address}=="<replaceable>52:54:00:12:34:56</replaceable>", NAME="<replaceable>realtek</replaceable>"
+ACTION=="add", SUBSYSTEM=="net", SYSFS{address}=="<replaceable>00:a0:c9:78:9a:bc</replaceable>", NAME="<replaceable>intel</replaceable>"
+EOF</userinput></screen>
+
+    <para>These rules will always rename the network cards to
+    <quote>realtek</quote> and <quote>intel</quote>, independently of the
+    original numbering provided by the kernel. Use these names instead of
+    <quote>eth0</quote> in the network interface configuration files created
+    below.</para>
+
+    <note><para>Persistent names must be different from the default network
+    interface names assigned by the kernel.</para></note>
+  </sect2>
   <sect2>
     <title>Creating Network Interface Configuration Files</title>