<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*--> <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> <!-- This file is part of systemd. Copyright 2014 Vinay Kulkarni systemd is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. systemd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with systemd; If not, see <http://www.gnu.org/licenses/>. --> <refentry id="networkd.conf" conditional='ENABLE_NETWORKD' xmlns:xi="http://www.w3.org/2001/XInclude"> <refentryinfo> <title>networkd.conf</title> <productname>systemd</productname> <authorgroup> <author> <contrib>Developer</contrib> <firstname>Vinay</firstname> <surname>Kulkarni</surname> <email>kulkarniv@vmware.com</email> </author> </authorgroup> </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>[DHCP] Section Options</title> <para>This section configures the DHCP Unique Identifier (DUID) value used by DHCP protocol. DHCPv6 client protocol sends the DHCP Unique Identifier and the interface Identity Association Identifier (IAID) to a DHCP server when acquiring a dynamic IPv6 address. 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. 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>link-layer-time</option> </term> <term><option>link-layer</option> </term> <term><option>uuid</option> </term> <listitem><para>Those values are parsed and can be used to set the DUID type field, but DUID contents must be provided using <varname>DUIDRawData=</varname>. </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 systemd-networkd generates using the machine-id from the <filename>/etc/machine-id</filename> file. 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>See Also</title> <para> <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, <citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum></citerefentry>, <citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>1</manvolnum></citerefentry> </para> </refsect1> </refentry>