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<?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.
For e.g. DHCP Unique Identifier (DUID).</para>
</refsect1>
<xi:include href="standard-conf.xml" xpointer="main-conf" />
<refsect1>
<title>[DUID] Section Options</title>
<para>This section configures the DHCP Unique Idendifier (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 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>.</para>
<para>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>
<para>The following options are available in <literal>[DUID]</literal> section:</para>
<variablelist class='network-directives'>
<varlistentry>
<term><varname>RawData=</varname></term>
<listitem><para>Specifies the DUID bytes as a single newline-terminated, hexadecimal
string, with each byte separated by a ':'.</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>machine-id</refentrytitle><manvolnum>1</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>
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