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+<?xml version='1.0'?>
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
+ "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+
+<!--
+ SPDX-License-Identifier: LGPL-2.1-or-later
+
+ Copyright © 2014 Vinay Kulkarni
+-->
+
+<refentry id="networkd.conf" conditional='ENABLE_NETWORKD'
+ xmlns:xi="http://www.w3.org/2001/XInclude">
+ <refentryinfo>
+ <title>networkd.conf</title>
+ <productname>systemd</productname>
+ </refentryinfo>
+
+ <refmeta>
+ <refentrytitle>networkd.conf</refentrytitle>
+ <manvolnum>5</manvolnum>
+ </refmeta>
+
+ <refnamediv>
+ <refname>networkd.conf</refname>
+ <refname>networkd.conf.d</refname>
+ <refpurpose>Global Network configuration files</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <para><filename>/etc/systemd/networkd.conf</filename></para>
+ <para><filename>/etc/systemd/networkd.conf.d/*.conf</filename></para>
+ <para><filename>/usr/lib/systemd/networkd.conf.d/*.conf</filename></para>
+ </refsynopsisdiv>
+
+ <refsect1>
+ <title>Description</title>
+
+ <para>These configuration files control global network parameters.
+ Currently the DHCP Unique Identifier (DUID).</para>
+
+ </refsect1>
+
+ <xi:include href="standard-conf.xml" xpointer="main-conf" />
+
+ <refsect1>
+ <title>[Network] Section Options</title>
+
+ <para>The following options are available in the [Network] section:</para>
+
+ <variablelist class='network-directives'>
+ <varlistentry>
+ <term><varname>SpeedMeter=</varname></term>
+ <listitem><para>Takes a boolean. If set to yes, then <command>systemd-networkd</command>
+ measures the traffic of each interface, and
+ <command>networkctl status <replaceable>INTERFACE</replaceable></command> shows the measured speed.
+ Defaults to no.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><varname>SpeedMeterIntervalSec=</varname></term>
+ <listitem><para>Specifies the time interval to calculate the traffic speed of each interface.
+ If <varname>SpeedMeter=no</varname>, the value is ignored. Defaults to 10sec.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><varname>ManageForeignRoutingPolicyRules=</varname></term>
+ <listitem><para>A boolean. When true, <command>systemd-networkd</command> will remove rules
+ that are not configured in .network files (except for rules with protocol
+ <literal>kernel</literal>). When false, it will not remove any foreign rules, keeping them even
+ if they are not configured in a .network file. Defaults to yes.
+ </para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><varname>ManageForeignRoutes=</varname></term>
+ <listitem><para>A boolean. When true, <command>systemd-networkd</command> will remove routes
+ that are not configured in .network files (except for routes with protocol
+ <literal>kernel</literal>, <literal>dhcp</literal> when <varname>KeepConfiguration=</varname>
+ is true or <literal>dhcp</literal>, and <literal>static</literal> when
+ <varname>KeepConfiguration=</varname> is true or <literal>static</literal>). When false, it will
+ not remove any foreign routes, keeping them even if they are not configured in a .network file.
+ Defaults to yes.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><varname>RouteTable=</varname></term>
+ <listitem><para>Defines the route table name. Takes a whitespace-separated list of the pairs of
+ route table name and number. The route table name and number in each pair are separated with a
+ colon, i.e., <literal><replaceable>name</replaceable>:<replaceable>number</replaceable></literal>.
+ The route table name must not be <literal>default</literal>, <literal>main</literal>, or
+ <literal>local</literal>, as these route table names are predefined with route table number 253,
+ 254, and 255, respectively. The route table number must be an integer in the range 1…4294967295.
+ This setting can be specified multiple times. If an empty string is specified, then the list
+ specified earlier are cleared. Defaults to unset.</para></listitem>
+ </varlistentry>
+
+ </variablelist>
+ </refsect1>
+
+ <refsect1>
+ <title>[DHCPv4] Section Options</title>
+
+ <para>This section configures the DHCP Unique Identifier (DUID) value used by DHCP protocol. DHCPv4
+ client protocol sends IAID and DUID to the DHCP server when acquiring a dynamic IPv4 address if
+ <option>ClientIdentifier=duid</option>. IAID and DUID allows a DHCP server to uniquely identify the
+ machine and the interface requesting a DHCP IP address. To configure IAID and ClientIdentifier, see
+ <citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
+ </para>
+
+ <para>The following options are understood:</para>
+
+ <variablelist class='network-directives'>
+ <varlistentry>
+ <term><varname>DUIDType=</varname></term>
+ <listitem><para>Specifies how the DUID should be generated. See
+ <ulink url="https://tools.ietf.org/html/rfc3315#section-9">RFC 3315</ulink>
+ for a description of all the options.</para>
+
+ <para>The following values are understood:
+ <variablelist>
+ <varlistentry>
+ <term><option>vendor</option></term>
+ <listitem><para>If <literal>DUIDType=vendor</literal>, then the DUID value will be generated using
+ <literal>43793</literal> as the vendor identifier (systemd) and hashed contents of
+ <citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
+ This is the default if <varname>DUIDType=</varname> is not specified.
+ </para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>uuid</option></term>
+ <listitem><para>If <literal>DUIDType=uuid</literal>, and <varname>DUIDRawData=</varname> is not set,
+ then the product UUID is used as a DUID value. If a system does not have valid product UUID, then
+ an application-specific
+ <citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+ is used as a DUID value. About the application-specific machine ID, see
+ <citerefentry><refentrytitle>sd_id128_get_machine_app_specific</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
+ </para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>link-layer-time[:<replaceable>TIME</replaceable>]</option></term>
+ <term><option>link-layer</option></term>
+ <listitem><para>If <literal>link-layer-time</literal> or <literal>link-layer</literal> is specified,
+ then the MAC address of the interface is used as a DUID value. The value <literal>link-layer-time</literal>
+ can take additional time value after a colon, e.g. <literal>link-layer-time:2018-01-23 12:34:56 UTC</literal>.
+ The default time value is <literal>2000-01-01 00:00:00 UTC</literal>.
+ </para></listitem>
+ </varlistentry>
+ </variablelist>
+ </para>
+
+ <para>In all cases, <varname>DUIDRawData=</varname> can be used to override the
+ actual DUID value that is used.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><varname>DUIDRawData=</varname></term>
+ <listitem><para>Specifies the DHCP DUID value as a single newline-terminated, hexadecimal string, with each
+ byte separated by <literal>:</literal>. The DUID that is sent is composed of the DUID type specified by
+ <varname>DUIDType=</varname> and the value configured here.</para>
+
+ <para>The DUID value specified here overrides the DUID that
+ <citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+ generates from the machine ID. To configure DUID per-network, see
+ <citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
+ The configured DHCP DUID should conform to the specification in
+ <ulink url="http://tools.ietf.org/html/rfc3315#section-9">RFC 3315</ulink>,
+ <ulink url="http://tools.ietf.org/html/rfc6355">RFC 6355</ulink>. To configure IAID, see
+ <citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum>
+ </citerefentry>.</para>
+
+ <example>
+ <title>A <option>DUIDType=vendor</option> with a custom value</title>
+
+ <programlisting>DUIDType=vendor
+DUIDRawData=00:00:ab:11:f9:2a:c2:77:29:f9:5c:00</programlisting>
+
+ <para>This specifies a 14 byte DUID, with the type DUID-EN (<literal>00:02</literal>), enterprise number
+ 43793 (<literal>00:00:ab:11</literal>), and identifier value <literal>f9:2a:c2:77:29:f9:5c:00</literal>.
+ </para>
+ </example>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+
+ <refsect1>
+ <title>[DHCPv6] Section Options</title>
+
+ <para>This section configures the DHCP Unique Identifier (DUID) value used by DHCPv6 protocol.
+ DHCPv6 client protocol sends the DHCP Unique Identifier and the interface Identity Association
+ Identifier (IAID) to a DHCPv6 server when acquiring a dynamic IPv6 address. IAID and DUID allows a
+ DHCPv6 server to uniquely identify the machine and the interface requesting a DHCP IP address. To
+ configure IAID, see
+ <citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
+ </para>
+
+ <para>The following options are understood:</para>
+
+ <variablelist class='network-directives'>
+ <varlistentry>
+ <term><varname>DUIDType=</varname></term>
+ <term><varname>DUIDRawData=</varname></term>
+ <listitem><para>As in the [DHCPv4] section.</para></listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+
+ <refsect1>
+ <title>See Also</title>
+ <para>
+ <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_id128_get_machine_app_specific</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ </para>
+ </refsect1>
+
+</refentry>