During runtime only the binary database is used.</para>
</refsect1>
+ <refsect1><title>Network Link Configuration</title>
+ <para>Network link configuration is performed by the <literal>net-setup-link</literal>
+ udev builtin.</para>
+
+ <para>The link files are read from the files located in the
+ system network directory <filename>/usr/lib/systemd/network</filename>,
+ the volatile runtime network directory <filename>/run/systemd/network</filename>
+ and the local administration network directory <filename>/etc/systemd/network</filename>.
+ All link files are collectively sorted and processed in lexical order,
+ regardless of the directories in which they live. However, files with
+ identical filenames replace each other. Files in <filename>/etc</filename>
+ have the highest priority, files in <filename>/run</filename> take precedence
+ over files with the same name in <filename>/lib</filename>. This can be
+ used to override a system-supplied link file with a local file if needed;
+ a symlink in <filename>/etc</filename> with the same name as a link file in
+ <filename>/lib</filename>, pointing to <filename>/dev/null</filename>,
+ disables the link file entirely. Link files must have the extension
+ <filename>.link</filename>; other extensions are ignored.</para>
+
+ <para>The link file contains a <literal>[Match]</literal> section, which
+ determines if a given link file may be applied to a given device; and a
+ <literal>[Link]</literal> section specifying how the device should be
+ configured. The first (in lexical order) of the link files that matches
+ a given device is applied.</para>
+
+ <para>A link file is said to match a device if each of the entries in the
+ <literal>[Match]</literal> section matches, or if the section is empty.
+ The following keys are accepted:</para>
+
+ <variablelist class='network-directives'>
+ <varlistentry>
+ <term><varname>MACAddress</varname></term>
+ <listitem>
+ <para>The hardware address.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>Path</varname></term>
+ <listitem>
+ <para>The persistent path, as exposed by the udev property <literal>ID_PATH</literal>.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>Driver</varname></term>
+ <listitem>
+ <para>The driver currently bound to the device, as exposed by the udev property <literal>DRIVER</literal>.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>Type</varname></term>
+ <listitem>
+ <para>The device type, as exposed by the udev property <literal>DEVTYPE</literal>.</para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+
+ <para>The <literal>[Link]</literal> section accepts the following keys:</para>
+
+ <variablelist class='network-directives'>
+ <varlistentry>
+ <term><varname>Description</varname></term>
+ <listitem>
+ <para>A description of the device. The <literal>ifalias</literal> is set to this value.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>MACAddressPolicy</varname></term>
+ <listitem>
+ <para>The policy by which the MAC address should be set. The available policies are:</para>
+ <variablelist>
+ <varlistentry>
+ <term><literal>persistent</literal></term>
+ <listitem>
+ <para>If the hardware has a persistent MAC address, as most hardware should, and this is used by
+ the kernel, nothing is done. Otherwise, a new MAC address is generated which is guaranteed to be
+ the same on every boot for the given machine and the given device, but which is otherwise random.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><literal>random</literal></term>
+ <listitem>
+ <para>If the kernel is using a random MAC address, nothing is done. Otherwise, a new address is
+ randomly generated each time the device appears, typically at boot.</para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>MACAddress</varname></term>
+ <listitem>
+ <para>The MAC address to use, if no <literal>MACAddressPolicy</literal> is specified.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>NamePolicy</varname></term>
+ <listitem>
+ <para>An ordered, space-separated list of policies by which the interface name should be set.
+ <literal>NamePolicy</literal> may be disabeld by specifying <literal>net.ifnames=0</literal> on the
+ kernel commandline. Each of the policies may fail, and the first successfull one is used. The name
+ is not set directly, but exported to udev as the property <literal>ID_NET_NAME</literal>, which is
+ by default used by an udev rule to set <literal>NAME</literal>. The available policies are:</para>
+ <variablelist>
+ <varlistentry>
+ <term><literal>onboard</literal></term>
+ <listitem>
+ <para>The name is set based on information given by the firmware for on-board devices, as
+ exported by the udev property <literal>ID_NET_NAME_ONBOARD</literal>.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><literal>slot</literal></term>
+ <listitem>
+ <para>The name is set based on information given by the firmware for hot-plug devices, as
+ exported by the udev property <literal>ID_NET_NAME_SLOT</literal>.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><literal>path</literal></term>
+ <listitem>
+ <para>The name is set based on the device's physical location, as exported by the udev
+ property <literal>ID_NET_NAME_PATH</literal>.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><literal>mac</literal></term>
+ <listitem>
+ <para>The name is set based on the device's persistent MAC address, as exported by the udev
+ property <literal>ID_NET_NAME_MAC</literal>.</para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>Name</varname></term>
+ <listitem>
+ <para>The interface name to use in case all the policies specified in <literal>NamePolicy</literal>
+ fail, or in case <literal>NamePolicy</literal> is missing or disabled.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>MTU</varname></term>
+ <listitem>
+ <para>The MTU to set for the device.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>SpeedMBytes</varname></term>
+ <listitem>
+ <para>The speed to set for the device.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>Duplex</varname></term>
+ <listitem>
+ <para>The duplex mode to set for the device. The accepted values are <literal>half</literal> and
+ <literal>full</literal>.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>WakeOnLan</varname></term>
+ <listitem>
+ <para>The Wake-On-Lan policy to set for the device. The supported values are:</para>
+ <variablelist>
+ <varlistentry>
+ <term><literal>phy</literal></term>
+ <listitem>
+ <para>Wake on PHY activity.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><literal>magic</literal></term>
+ <listitem>
+ <para>Wake on receipt of magic packet.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><literal>off</literal></term>
+ <listitem>
+ <para>Never wake.</para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+
<refsect1>
<title>See Also</title>
<para><citerefentry>
~ianmdlvl / elogind.git / commitdiff