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systemd/man/systemd.network.xml
Michael Marineau 301f4073fe network: add UseNTP DHCP option 
Despite having the internal logic in place to enable/disable using NTP
servers provided by DHCP the network config didn't expose the option.
2015-03-15 17:26:58 -04:00

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<?xml version='1.0'?> <!--*-nxml-*-->
<!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 2013 Tom Gundersen
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
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You should have received a copy of the GNU Lesser General Public License
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<refentry id="systemd.network" conditional='ENABLE_NETWORKD'>
<refentryinfo>
<title>systemd.network</title>
<productname>systemd</productname>
<authorgroup>
<author>
<contrib>Developer</contrib>
<firstname>Tom</firstname>
<surname>Gundersen</surname>
<email>teg@jklm.no</email>
</author>
</authorgroup>
</refentryinfo>
<refmeta>
<refentrytitle>systemd.network</refentrytitle>
<manvolnum>5</manvolnum>
</refmeta>
<refnamediv>
<refname>systemd.network</refname>
<refpurpose>Network configuration</refpurpose>
</refnamediv>
<refsynopsisdiv>
<para><filename><replaceable>network</replaceable>.network</filename></para>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>Network setup is performed by
<citerefentry><refentrytitle>systemd-networkd</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
</para>
<para>Network files must have the extension
<filename>.network</filename>; other extensions are ignored.
Networks are applied to links whenever the links appear.</para>
<para>The <filename>.network</filename> 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 configuration 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>/usr/lib</filename>. This can be used to
override a system-supplied configuration file with a local file if
needed; a symlink in <filename>/etc</filename> with the same name
as a configuration file in <filename>/usr/lib</filename>, pointing
to <filename>/dev/null</filename>, disables the configuration file
entirely.</para>
</refsect1>
<refsect1>
<title>[Match] Section Options</title>
<para>The network file contains a <literal>[Match]</literal>
section, which determines if a given network file may be applied
to a given device; and a <literal>[Network]</literal> section
specifying how the device should be configured. The first (in
lexical order) of the network files that matches a given device
is applied.</para>
<para>A network 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>A whitespace-separated list of shell-style globs
matching the persistent path, as exposed by the udev
property <literal>ID_PATH</literal>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>Driver=</varname></term>
<listitem>
<para>A whitespace-separated list of shell-style globs
matching the driver currently bound to the device, as
exposed by the udev property <literal>DRIVER</literal>
of its parent device, or if that is not set the driver
as exposed by <literal>ethtool -i</literal> of the
device itself.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>Type=</varname></term>
<listitem>
<para>A whitespace-separated list of shell-style globs
matching the device type, as exposed by the udev property
<literal>DEVTYPE</literal>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>Name=</varname></term>
<listitem>
<para>A whitespace-separated list of shell-style globs
matching the device name, as exposed by the udev property
<literal>INTERFACE</literal>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>Host=</varname></term>
<listitem>
<para>Matches against the hostname or machine ID of the
host. See <literal>ConditionHost=</literal> in
<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
for details.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>Virtualization=</varname></term>
<listitem>
<para>Checks whether the system is executed in a virtualized
environment and optionally test whether it is a specific
implementation. See <literal>ConditionVirtualization=</literal> in
<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
for details.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>KernelCommandLine=</varname></term>
<listitem>
<para>Checks whether a specific kernel command line option is
set (or if prefixed with the exclamation mark unset). See
<literal>ConditionKernelCommandLine=</literal> in
<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
for details.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>Architecture=</varname></term>
<listitem>
<para>Checks whether the system is running on a specific
architecture. See <literal>ConditionArchitecture=</literal> in
<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
for details.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>[Link] Section Options</title>
<para> The <literal>[Link]</literal> section accepts the following keys:</para>
<variablelist class='network-directives'>
<varlistentry>
<term><varname>MACAddress=</varname></term>
<listitem>
<para>The hardware address.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>MTUBytes=</varname></term>
<listitem>
<para>The maximum transmission unit in bytes to set for the
device. The usual suffixes K, M, G, are supported and are
understood to the base of 1024.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>[Network] Section Options</title>
<para>The <literal>[Network]</literal> section accepts the following keys:</para>
<variablelist class='network-directives'>
<varlistentry>
<term><varname>Description=</varname></term>
<listitem>
<para>A description of the device. This is only used for
presentation purposes.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>DHCP=</varname></term>
<listitem>
<para>Enables DHCPv4 and/or DHCPv6 support. Accepts
<literal>yes</literal>, <literal>no</literal>,
<literal>ipv4</literal>, or <literal>ipv6</literal>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>DHCPServer=</varname></term>
<listitem>
<para>A boolean. Enables a basic DHCPv4 server on the
device. Mostly useful for handing out leases to container
instances.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>LinkLocalAddressing=</varname></term>
<listitem>
<para>Enables link-local address autoconfiguration. Accepts
<literal>yes</literal>, <literal>no</literal>,
<literal>ipv4</literal>, or <literal>ipv6</literal>. Defaults to
<literal>ipv6</literal>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>IPv4LLRoute=</varname></term>
<listitem>
<para>A boolean. When true, sets up the route needed for
non-IPv4LL hosts to communicate with IPv4LL-only hosts. Defaults
to false.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>IPv6Token=</varname></term>
<listitem>
<para>An IPv6 address with the top 64 bits unset. When set, indicates the
64 bits interface part of SLAAC IPv6 addresses for this link. By default
it is autogenerated.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>LLMNR=</varname></term>
<listitem>
<para>A boolean or <literal>resolve</literal>. When true, enables
Link-Local Multicast Name Resolution on the link, when set to
<literal>resolve</literal> only resolution is enabled, but not
announcement. Defaults to true.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>LLDP=</varname></term>
<listitem>
<para>A boolean. When true, enables LLDP link receive support.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>BindCarrier=</varname></term>
<listitem>
<para>A port or a list of ports. When set, controls the
behaviour of the current interface. When all ports in the list
are in an operational down state, the current interface is brought
down. When at least one port has carrier, the current interface
is brought up.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>Address=</varname></term>
<listitem>
<para>A static IPv4 or IPv6 address and its prefix length,
separated by a <literal>/</literal> character. Specify
this key more than once to configure several addresses.
The format of the address must be as described in
<citerefentry project='man-pages'><refentrytitle>inet_pton</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
This is a short-hand for an [Address] section only
containing an Address key (see below). This option may be
specified more than once.
</para>
<para>If the specified address is 0.0.0.0 (for IPv4) or
[::] (for IPv6), a new address range of the requested size
is automatically allocated from a system-wide pool of
unused ranges. The allocated range is checked against all
current network interfaces and all known network
configuration files to avoid address range conflicts. The
default system-wide pool consists of 192.168.0.0/16,
172.16.0.0/12 and 10.0.0.0/8 for IPv4, and fc00::/7 for
IPv6. This functionality is useful to manage a large
number of dynamically created network interfaces with the
same network configuration and automatic address range
assignment.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>Gateway=</varname></term>
<listitem>
<para>The gateway address, which must be in the format
described in
<citerefentry project='man-pages'><refentrytitle>inet_pton</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
This is a short-hand for a [Route] section only containing
a Gateway key. This option may be specified more than
once.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>DNS=</varname></term>
<listitem>
<para>A DNS server address, which must be in the format
described in
<citerefentry project='man-pages'><refentrytitle>inet_pton</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
This option may be specified more than once.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>Domains=</varname></term>
<listitem>
<para>The domains used for DNS resolution over this link.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>NTP=</varname></term>
<listitem>
<para>An NTP server address. This option may be specified more than once.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>IPForward=</varname></term>
<listitem><para>Configures IP forwarding for the network
interface. If enabled incoming packets on the network
interface will be forwarded to other interfaces according to
the routing table. Takes either a boolean argument, or the
values <literal>ipv4</literal> or <literal>ipv6</literal>,
which only enables IP forwarding for the specified address
family.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>IPMasquerade=</varname></term>
<listitem><para>Configures IP masquerading for the network
interface. If enabled packets forwarded from the network
interface will be appear as coming from the local host.
Takes a boolean argument. Implies
<varname>IPForward=yes</varname>.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>Bridge=</varname></term>
<listitem>
<para>The name of the bridge to add the link to.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>Bond=</varname></term>
<listitem>
<para>The name of the bond to add the link to.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>VLAN=</varname></term>
<listitem>
<para>The name of a VLAN to create on the link. This
option may be specified more than once.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>MACVLAN=</varname></term>
<listitem>
<para>The name of a MACVLAN to create on the link. This
option may be specified more than once.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>VXLAN=</varname></term>
<listitem>
<para>The name of a VXLAN to create on the link. This
option may be specified more than once.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>Tunnel=</varname></term>
<listitem>
<para>The name of a Tunnel to create on the link. This
option may be specified more than once.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>[Address] Section Options</title>
<para>An <literal>[Address]</literal> section accepts the
following keys. Specify several <literal>[Address]</literal>
sections to configure several addresses.</para>
<variablelist class='network-directives'>
<varlistentry>
<term><varname>Address=</varname></term>
<listitem>
<para>As in the <literal>[Network]</literal> section. This
key is mandatory.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>Peer=</varname></term>
<listitem>
<para>The peer address in a point-to-point connection.
Accepts the same format as the <literal>Address</literal>
key.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>Broadcast=</varname></term>
<listitem>
<para>The broadcast address, which must be in the format
described in
<citerefentry project='man-pages'><refentrytitle>inet_pton</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
This key only applies to IPv4 addresses. If it is not
given, it is derived from the <literal>Address</literal>
key.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>Label=</varname></term>
<listitem>
<para>An address label.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>[Route] Section Options</title>
<para>The <literal>[Route]</literal> section accepts the
following keys. Specify several <literal>[Route]</literal>
sections to configure several routes.</para>
<variablelist class='network-directives'>
<varlistentry>
<term><varname>Gateway=</varname></term>
<listitem>
<para>As in the <literal>[Network]</literal> section.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>Destination=</varname></term>
<listitem>
<para>The destination prefix of the route. Possibly
followed by a slash and the prefixlength. If omitted, a
full-length host route is assumed.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>Source=</varname></term>
<listitem>
<para>The source prefix of the route. Possibly followed by
a slash and the prefixlength. If omitted, a full-length
host route is assumed.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>Metric=</varname></term>
<listitem>
<para>The metric of the route. An unsigned integer</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>Scope=</varname></term>
<listitem>
<para>The scope of the route. One of the values <literal>global</literal>,
<literal>link</literal> or <literal>host</literal>. Defaults to
<literal>global</literal>.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>[DHCP] Section Options</title>
<para>The <literal>[DHCP]</literal> section accepts the following keys:</para>
<variablelist class='network-directives'>
<varlistentry>
<term><varname>UseDNS=</varname></term>
<listitem>
<para>When true (the default), the DNS servers received
from the DHCP server will be used and take precedence over
any statically configured ones.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>UseNTP=</varname></term>
<listitem>
<para>When true (the default), the NTP servers received
from the DHCP server will be used by systemd-timesyncd
and take precedence over any statically configured ones.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>UseMTU=</varname></term>
<listitem>
<para>When true, the interface maximum transmission unit
from the DHCP server will be used on the current link.
Defaults to false.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>SendHostname=</varname></term>
<listitem>
<para>When true (the default), the machine's hostname will be sent to the DHCP
server</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>UseHostname=</varname></term>
<listitem>
<para>When true (the default), the hostname received from
the DHCP server will be used as the transient
hostname.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>UseDomains=</varname></term>
<listitem>
<para>When true (not the default), the domain name
received from the DHCP server will be used for DNS
resolution over this link.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>UseRoutes=</varname></term>
<listitem>
<para>When true (the default), the static routes will be
requested from the DHCP server and added to the routing
table with metric of 1024.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>CriticalConnection=</varname></term>
<listitem>
<para>When true, the connection will never be torn down
even if the DHCP lease expires. This is contrary to the
DHCP specification, but may be the best choice if, say,
the root filesystem relies on this connection. Defaults to
false.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>ClientIdentifier=</varname></term>
<listitem>
<para>DHCP client identifier to use. Either <literal>mac</literal>
to use the MAC address of the link or <literal>duid</literal>
(the default) to use a RFC4361-compliant Client ID.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>VendorClassIdentifier=</varname></term>
<listitem>
<para>The vendor class identifier used to identify vendor
type and configuration.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>RequestBroadcast=</varname></term>
<listitem>
<para>Request the server to use broadcast messages before
the IP address has been configured. This is necessary for
devices that cannot receive RAW packets, or that cannot
receive packets at all before an IP address has been
configured. On the other hand, this must not be enabled on
networks where broadcasts are filtered out.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>RouteMetric=</varname></term>
<listitem>
<para>Set the routing metric for routes specified by the
DHCP server.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>[Bridge] Section Options</title>
<para>The <literal>[Bridge]</literal> section accepts the
following keys.</para>
<variablelist class='network-directives'>
<varlistentry>
<term><varname>Cost=</varname></term>
<listitem>
<para>Each port in a bridge may have different speed. Cost
is used to decide which link to use. Faster interfaces
should have lower costs</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>[BridgeFDB] Section Options</title>
<para>The <literal>[BridgeFDB]</literal> section manages the
forwarding database table of a port and accepts the following
keys. Specify several <literal>[BridgeFDB]</literal> sections to
configure several static MAC table entries.</para>
<variablelist class='network-directives'>
<varlistentry>
<term><varname>MACAddress=</varname></term>
<listitem>
<para>As in the <literal>[Network]</literal> section. This
key is mandatory.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>VLANId=</varname></term>
<listitem>
<para>The VLAN Id for the new static MAC table entry. If
omitted, no VLAN Id info is appended to the new static MAC
table entry.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Example</title>
<example>
<title>/etc/systemd/network/50-static.network</title>
<programlisting>[Match]
Name=enp2s0
[Network]
Address=192.168.0.15/24
Gateway=192.168.0.1</programlisting>
</example>
<example>
<title>/etc/systemd/network/80-dhcp.network</title>
<programlisting>[Match]
Name=en*
[Network]
DHCP=yes</programlisting>
</example>
<example>
<title>/etc/systemd/network/bridge-static.network</title>
<programlisting>[Match]
Name=bridge0
[Network]
Address=192.168.0.15/24
Gateway=192.168.0.1
DNS=192.168.0.1</programlisting>
</example>
<example>
<title>/etc/systemd/network/bridge-slave-interface.network</title>
<programlisting>[Match]
Name=enp2s0
[Network]
Bridge=bridge0</programlisting>
</example>
<example>
<title>/etc/systemd/network/ipip.network</title>
<programlisting>[Match]
Name=em1
[Network]
Tunnel=ipip-tun</programlisting>
</example>
<example>
<title>/etc/systemd/network/sit.network</title>
<programlisting>[Match]
Name=em1
[Network]
Tunnel=sit-tun</programlisting>
</example>
<example>
<title>/etc/systemd/network/gre.network</title>
<programlisting>[Match]
Name=em1
[Network]
Tunnel=gre-tun</programlisting>
</example>
<example>
<title>/etc/systemd/network/vti.network</title>
<programlisting>[Match]
Name=em1
[Network]
Tunnel=vti-tun</programlisting>
</example>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd-networkd</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.link</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.netdev</refentrytitle><manvolnum>5</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>
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