path: root/man/networkd.conf.xml

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<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><simplelist>
      <member><filename>/etc/systemd/networkd.conf</filename></member>
      <member><filename>/run/systemd/networkd.conf</filename></member>
      <member><filename>/usr/local/lib/systemd/networkd.conf</filename></member>
      <member><filename>/usr/lib/systemd/networkd.conf</filename></member>
      <member><filename>/etc/systemd/networkd.conf.d/*.conf</filename></member>
      <member><filename>/run/systemd/networkd.conf.d/*.conf</filename></member>
      <member><filename>/usr/local/lib/systemd/networkd.conf.d/*.conf</filename></member>
      <member><filename>/usr/lib/systemd/networkd.conf.d/*.conf</filename></member>
    </simplelist></para>
  </refsynopsisdiv>

  <refsect1>
    <title>Description</title>

    <para>These configuration files control global network parameters.</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>

        <xi:include href="version-info.xml" xpointer="v244"/></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>

        <xi:include href="version-info.xml" xpointer="v244"/></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>

        <xi:include href="version-info.xml" xpointer="v249"/></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>

        <xi:include href="version-info.xml" xpointer="v246"/></listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>ManageForeignNextHops=</varname></term>
        <listitem><para>A boolean. When true, <command>systemd-networkd</command> will remove nexthops
        that are not configured in .network files (except for routes with protocol
        <literal>kernel</literal>). When false, it will
        not remove any foreign nexthops, keeping them even if they are not configured in a .network file.
        Defaults to yes.</para>

        <xi:include href="version-info.xml" xpointer="v256"/></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,
        except for predefined numbers 253, 254, and 255. This setting can be specified multiple times.
        If an empty string is specified, then the list specified earlier are cleared. Defaults to unset.
        </para>

        <xi:include href="version-info.xml" xpointer="v248"/></listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>IPv4Forwarding=</varname></term>
        <listitem>
          <para>Configures IPv4 packet forwarding for the system. Takes a boolean value. This controls the
          <filename>net.ipv4.conf.default.forwarding</filename> and
          <filename>net.ipv4.conf.all.forwarding</filename>sysctl options. See
          <ulink url="https://docs.kernel.org/networking/ip-sysctl.html">IP Sysctl</ulink>
          for more details about the sysctl options. Defaults to unset and the sysctl options will not be
          changed.</para>

          <para>If an interface is configured with a .network file that enables <varname>IPMasquerade=</varname>
          for IPv4 (that is, <literal>ipv4</literal> or <literal>both</literal>), this setting is implied
          unless explicitly specified. See <varname>IPMasquerade=</varname> in
          <citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum></citerefentry>
          for more details.</para>

          <xi:include href="version-info.xml" xpointer="v256"/>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>IPv6Forwarding=</varname></term>
        <listitem>
          <para>Configures IPv6 packet forwarding for the system. Takes a boolean value. This controls the
          <filename>net.ipv6.conf.default.forwarding</filename> and
          <filename>net.ipv6.conf.all.forwarding</filename> sysctl options. See
          <ulink url="https://docs.kernel.org/networking/ip-sysctl.html">IP Sysctl</ulink>
          for more details about the sysctl options. Defaults to unset and the sysctl options will not be
          changed.</para>

          <para>If an interface is configured with a .network file that enables <varname>IPMasquerade=</varname>
          for IPv6 (that is, <literal>ipv6</literal> or <literal>both</literal>), this setting is implied
          unless explicitly specified. See <varname>IPMasquerade=</varname> in
          <citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum></citerefentry>
          for more details.</para>

          <xi:include href="version-info.xml" xpointer="v256"/>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>IPv6PrivacyExtensions=</varname></term>
        <listitem>
          <para>Specifies the default value for per-network <varname>IPv6PrivacyExtensions=</varname>.
          Takes a boolean or the special values <literal>prefer-public</literal> and
          <literal>kernel</literal>. See for details in
          <citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
          Defaults to <literal>no</literal>.</para>

        <xi:include href="version-info.xml" xpointer="v254"/>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>UseDomains=</varname></term>
        <listitem>
          <para>Specifies the network- and protocol-independent default value for the same settings in
          [IPv6AcceptRA], [DHCPv4], and [DHCPv6] sections below. Takes a boolean, or the special value
          <option>route</option>. See the same setting in
          <citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
          Defaults to <literal>no</literal>.</para>

          <xi:include href="version-info.xml" xpointer="v256"/>
        </listitem>
      </varlistentry>
    </variablelist>
  </refsect1>

  <refsect1>
    <title>[IPv6AcceptRA] Section Options</title>

    <para>This section configures the default setting of the Neighbor Discovery. The following options are
    available in the [IPv6AcceptRA] section:</para>

    <variablelist class='network-directives'>
      <varlistentry>
        <term><varname>UseDomains=</varname></term>
        <listitem>
          <para>Specifies the network-independent default value for the same setting in the [IPv6AcceptRA]
          section in
          <citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
          Takes a boolean, or the special value <option>route</option>. When unspecified, the value specified
          in the [Network] section in
          <citerefentry><refentrytitle>networkd.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
          which defaults to <literal>no</literal>, will be used.</para>

          <xi:include href="version-info.xml" xpointer="v256"/>
        </listitem>
      </varlistentry>
    </variablelist>
  </refsect1>

  <refsect1>
    <title>[IPv6AddressLabel] Section Options</title>

    <para>An [IPv6AddressLabel] section accepts the following keys. Specify multiple [IPv6AddressLabel]
    sections to configure multiple address labels. IPv6 address labels are used for address selection.
    See <ulink url="https://tools.ietf.org/html/rfc3484">RFC 3484</ulink>. Precedence is managed by
    userspace, and only the label itself is stored in the kernel.</para>

    <variablelist class='network-directives'>
      <varlistentry>
        <term><varname>Label=</varname></term>
        <listitem>
          <para>The label for the prefix, an unsigned integer in the range 0…4294967294. 0xffffffff is
          reserved. This setting is mandatory.</para>

          <xi:include href="version-info.xml" xpointer="v257"/>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>Prefix=</varname></term>
        <listitem>
          <para>IPv6 prefix is an address with a prefix length, separated by a slash
          <literal>/</literal> character. This setting is mandatory.</para>

          <xi:include href="version-info.xml" xpointer="v257"/>
        </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>This takes an integer in the range 0…65535, or one of the following string values:
        <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>

            <xi:include href="version-info.xml" xpointer="v230"/></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>

            <xi:include href="version-info.xml" xpointer="v230"/></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>

            <xi:include href="version-info.xml" xpointer="v240"/></listitem>
          </varlistentry>
        </variablelist>
        </para>

        <para>In all cases, <varname>DUIDRawData=</varname> can be used to override the
        actual DUID value that is used.</para>

        <xi:include href="version-info.xml" xpointer="v230"/></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>

          <xi:include href="version-info.xml" xpointer="v230"/>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>UseDomains=</varname></term>
        <listitem>
          <para>Same as the one in the [IPv6AcceptRA] section, but applied for DHCPv4 protocol.</para>

          <xi:include href="version-info.xml" xpointer="v256"/>
        </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>

        <xi:include href="version-info.xml" xpointer="v249"/></listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>UseDomains=</varname></term>
        <listitem><para>As in the [DHCPv4] section.</para>

        <xi:include href="version-info.xml" xpointer="v256"/></listitem>
      </varlistentry>
    </variablelist>
  </refsect1>

  <refsect1>
    <title>[DHCPServer] Section Options</title>

    <para>This section configures the default setting of the DHCP server. The following options are available
    in the [DHCPServer] section:</para>

    <variablelist class='network-directives'>
      <varlistentry>
        <term><varname>UseDomains=</varname></term>
        <listitem>
          <para>Same as the one in the [IPv6AcceptRA] section, but applied for DHCPv4 protocol.</para>

          <xi:include href="version-info.xml" xpointer="v256"/>
        </listitem>
      </varlistentry>
    </variablelist>
  </refsect1>

  <refsect1>
      <title>See Also</title>
      <para><simplelist type="inline">
      <member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
      <member><citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum></citerefentry></member>
      <member><citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
      <member><citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry></member>
      <member><citerefentry><refentrytitle>sd_id128_get_machine_app_specific</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
      </simplelist></para>
  </refsect1>

</refentry>