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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 13:00:47 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 13:00:47 +0000
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treeda68ca54bb79f4080079bf0828acda937593a4e1 /man/systemd.net-naming-scheme.xml
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Adding upstream version 247.3.upstream/247.3upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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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 -->
+
+<refentry id="systemd.net-naming-scheme">
+ <refentryinfo>
+ <title>systemd.net-naming-scheme</title>
+ <productname>systemd</productname>
+ </refentryinfo>
+
+ <refmeta>
+ <refentrytitle>systemd.net-naming-scheme</refentrytitle>
+ <manvolnum>7</manvolnum>
+ </refmeta>
+
+ <refnamediv>
+ <refname>systemd.net-naming-scheme</refname>
+ <refpurpose>Network device naming schemes</refpurpose>
+ </refnamediv>
+
+ <refsect1>
+ <title>Description</title>
+
+ <para>Network interfaces names and MAC addresses may be generated based on certain stable interface
+ attributes. This is possible when there is enough information about the device to generate those
+ attributes and the use of this information is configured. This page describes interface naming, i.e. what
+ possible names may be generated. Those names are generated by the
+ <citerefentry><refentrytitle>systemd-udevd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+ builtin <command>net_id</command> and exported as udev properties
+ (<varname>ID_NET_NAME_ONBOARD=</varname>, <varname>ID_NET_LABEL_ONBOARD=</varname>,
+ <varname>ID_NET_NAME_PATH=</varname>, <varname>ID_NET_NAME_SLOT=</varname>).</para>
+
+ <para>Names and MAC addresses are derived from various stable device metadata attributes. Newer versions
+ of udev take more of these attributes into account, improving (and thus possibly changing) the names and
+ addresses used for the same devices. Different versions of those generation rules are called "naming
+ schemes". The default naming scheme is chosen at compilation time. Usually this will be the latest
+ implemented version, but it is also possible to set one of the older versions to preserve
+ compatibility. This may be useful for example for distributions, which may introduce new versions of
+ systemd in stable releases without changing the naming scheme. The naming scheme may also be overridden
+ using the <varname>net.naming-scheme=</varname> kernel command line switch, see
+ <citerefentry><refentrytitle>systemd-udevd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
+ Available naming schemes are described below.</para>
+
+ <para>After the udev properties have been generated, appropriate udev rules may be used to actually rename
+ devices based on those properties. See the description of <varname>NamePolicy=</varname> and
+ <varname>MACAddressPolicy=</varname> in
+ <citerefentry><refentrytitle>systemd.link</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
+
+ <para>Note that while the concept of network interface naming schemes is primarily relevant in the
+ context of <filename>systemd-udevd.service</filename>, the
+ <citerefentry><refentrytitle>systemd-nspawn</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+ container manager also takes it into account when naming network interfaces, see below.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>Naming</title>
+
+ <para>All names start with a two-character prefix that signifies the interface type.</para>
+
+ <table>
+ <title>Two character prefixes based on the type of interface</title>
+
+ <tgroup cols='2'>
+ <thead>
+ <row>
+ <entry>Prefix</entry>
+ <entry>Description</entry>
+ </row>
+ </thead>
+ <tbody>
+ <row>
+ <entry><constant>en</constant></entry>
+ <entry>Ethernet</entry>
+ </row>
+ <row>
+ <entry><constant>ib</constant></entry>
+ <entry>InfiniBand</entry>
+ </row>
+ <row>
+ <entry><constant>sl</constant></entry>
+ <entry>Serial line IP (slip)</entry>
+ </row>
+ <row>
+ <entry><constant>wl</constant></entry>
+ <entry>Wireless local area network (WLAN)</entry>
+ </row>
+ <row>
+ <entry><constant>ww</constant></entry>
+ <entry>Wireless wide area network (WWAN)</entry>
+ </row>
+ </tbody>
+ </tgroup>
+ </table>
+
+ <para>The udev <command>net_id</command> builtin exports the following udev device properties:</para>
+
+ <variablelist>
+ <varlistentry>
+ <term><varname>ID_NET_NAME_ONBOARD=<replaceable>prefix</replaceable><constant>o</constant><replaceable>number</replaceable></varname></term>
+
+ <listitem><para>This name is set based on the numeric ordering information given by the firmware
+ for on-board devices. The name consists of the prefix, letter <constant>o</constant>, and a number
+ specified by the firmware. This is only available for PCI devices.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><varname>ID_NET_LABEL_ONBOARD=<replaceable>prefix</replaceable> <replaceable>label</replaceable></varname></term>
+
+ <listitem><para>This property is set based on textual label given by the firmware for on-board
+ devices. The name consists of the prefix concatenated with the label. This is only available for
+ PCI devices.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><varname>ID_NET_NAME_MAC=<replaceable>prefix</replaceable><constant>x</constant><replaceable>AABBCCDDEEFF</replaceable></varname></term>
+
+ <listitem><para>This name consists of the prefix, letter <constant>x</constant>, and 12 hexadecimal
+ digits of the MAC address. It is available if the device has a fixed MAC address. Because this name
+ is based on an attribute of the card itself, it remains "stable" when the device is moved (even
+ between machines), but will change when the hardware is replaced.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><varname>ID_NET_NAME_SLOT=<replaceable>prefix</replaceable>[<constant>P</constant><replaceable>domain</replaceable>]<constant>s</constant><replaceable>slot</replaceable>[<constant>f</constant><replaceable>function</replaceable>][<constant>n</constant><replaceable>port_name</replaceable>|<constant>d</constant><replaceable>dev_port</replaceable>]</varname></term>
+ <term><varname>ID_NET_NAME_SLOT=<replaceable>prefix</replaceable><constant>v</constant><replaceable>slot</replaceable></varname></term>
+ <term><varname>ID_NET_NAME_SLOT=<replaceable>prefix</replaceable>[<constant>P</constant><replaceable>domain</replaceable>]<constant>s</constant><replaceable>slot</replaceable>[<constant>f</constant><replaceable>function</replaceable>][<constant>n</constant><replaceable>port_name</replaceable>|<constant>d</constant><replaceable>dev_port</replaceable>]<constant>b</constant><replaceable>number</replaceable></varname></term>
+ <term><varname>ID_NET_NAME_SLOT=<replaceable>prefix</replaceable>[<constant>P</constant><replaceable>domain</replaceable>]<constant>s</constant><replaceable>slot</replaceable>[<constant>f</constant><replaceable>function</replaceable>][<constant>n</constant><replaceable>port_name</replaceable>|<constant>d</constant><replaceable>dev_port</replaceable>]<constant>u</constant><replaceable>port</replaceable>…[<constant>c</constant><replaceable>config</replaceable>][<constant>i</constant><replaceable>interface</replaceable>]</varname></term>
+ <term><varname>ID_NET_NAME_SLOT=<replaceable>prefix</replaceable>[<constant>P</constant><replaceable>domain</replaceable>]<constant>s</constant><replaceable>slot</replaceable>[<constant>f</constant><replaceable>function</replaceable>][<constant>n</constant><replaceable>port_name</replaceable>|<constant>d</constant><replaceable>dev_port</replaceable>]<constant>v</constant><replaceable>slot</replaceable></varname></term>
+
+ <listitem><para>This property describes the slot position. Different schemes are used depending on
+ the bus type, as described in the table below. In case of USB, BCMA, and SR-VIO devices, the full
+ name consists of the prefix, PCI slot identifier, and USB or BCMA or SR-VIO slot identifier. The
+ first two parts are denoted as "…" in the table below.</para>
+
+ <table>
+ <title>Slot naming schemes</title>
+
+ <tgroup cols='2'>
+ <thead>
+ <row>
+ <entry>Format</entry>
+ <entry>Description</entry>
+ </row>
+ </thead>
+
+ <tbody>
+ <row>
+ <entry><replaceable>prefix</replaceable> [<constant>P</constant><replaceable>domain</replaceable>] <constant>s</constant><replaceable>slot</replaceable> [<constant>f</constant><replaceable>function</replaceable>] [<constant>n</constant><replaceable>port_name</replaceable> | <constant>d</constant><replaceable>dev_port</replaceable>]</entry>
+ <entry>PCI slot number</entry>
+ </row>
+
+ <row>
+ <entry><replaceable>prefix</replaceable> <constant>v</constant><replaceable>slot</replaceable></entry>
+ <entry>VIO slot number (IBM PowerVM)</entry>
+ </row>
+
+ <row>
+ <entry>… <constant>b</constant><replaceable>number</replaceable></entry>
+ <entry>Broadcom bus (BCMA) core number</entry>
+ </row>
+
+ <row>
+ <entry>… <constant>u</constant><replaceable>port</replaceable>… [<constant>c</constant><replaceable>config</replaceable>] [<constant>i</constant><replaceable>interface</replaceable>]</entry>
+ <entry>USB port number chain</entry>
+ </row>
+
+ <row>
+ <entry>… <constant>v</constant><replaceable>slot</replaceable></entry>
+ <entry>SR-VIO slot number</entry>
+ </row>
+ </tbody>
+ </tgroup>
+ </table>
+
+ <para>The PCI domain is only prepended when it is not 0. All multi-function PCI devices will carry
+ the <constant>f<replaceable>function</replaceable></constant> number in the device name, including
+ the function 0 device. For non-multi-function devices, the number is suppressed if 0. The port name
+ <replaceable>port_name</replaceable> is used, or the port number
+ <constant>d</constant><replaceable>dev_port</replaceable> if the name is not known.</para>
+
+ <para>For BCMA devices, the core number is suppressed when 0.</para>
+
+ <para>For USB devices the full chain of port numbers of hubs is composed. If the name gets longer
+ than the maximum number of 15 characters, the name is not exported. The usual USB configuration
+ number 1 and interface number 0 values are suppressed.</para>
+
+ <para>SR-IOV virtual devices are named based on the name of the parent interface, with a suffix of
+ <constant>v</constant> and the virtual device number, with any leading zeros removed. The bus
+ number is ignored.</para>
+
+ <para>In some configurations a parent PCI bridge of a given network controller may be associated
+ with a slot. In such case we don't generate this device property to avoid possible naming conflicts.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><varname>ID_NET_NAME_PATH=<replaceable>prefix</replaceable><constant>c</constant><replaceable>bus_id</replaceable></varname></term>
+ <term><varname>ID_NET_NAME_PATH=<replaceable>prefix</replaceable><constant>a</constant><replaceable>vendor</replaceable><replaceable>model</replaceable><constant>i</constant><replaceable>instance</replaceable></varname></term>
+ <term><varname>ID_NET_NAME_PATH=<replaceable>prefix</replaceable><constant>i</constant><replaceable>address</replaceable><constant>n</constant><replaceable>port_name</replaceable></varname></term>
+ <term><varname>ID_NET_NAME_PATH=<replaceable>prefix</replaceable>[<constant>P</constant><replaceable>domain</replaceable>]<constant>p</constant><replaceable>bus</replaceable><constant>s</constant><replaceable>slot</replaceable>[<constant>f</constant><replaceable>function</replaceable>][<constant>n</constant><replaceable>phys_port_name</replaceable>|<constant>d</constant><replaceable>dev_port</replaceable>]</varname></term>
+ <term><varname>ID_NET_NAME_PATH=<replaceable>prefix</replaceable>[<constant>P</constant><replaceable>domain</replaceable>]<constant>p</constant><replaceable>bus</replaceable><constant>s</constant><replaceable>slot</replaceable>[<constant>f</constant><replaceable>function</replaceable>][<constant>n</constant><replaceable>phys_port_name</replaceable>|<constant>d</constant><replaceable>dev_port</replaceable>]<constant>b</constant><replaceable>number</replaceable></varname></term>
+ <term><varname>ID_NET_NAME_PATH=<replaceable>prefix</replaceable>[<constant>P</constant><replaceable>domain</replaceable>]<constant>p</constant><replaceable>bus</replaceable><constant>s</constant><replaceable>slot</replaceable>[<constant>f</constant><replaceable>function</replaceable>][<constant>n</constant><replaceable>phys_port_name</replaceable>|<constant>d</constant><replaceable>dev_port</replaceable>]<constant>u</constant><replaceable>port</replaceable>…[<constant>c</constant><replaceable>config</replaceable>][<constant>i</constant><replaceable>interface</replaceable>]</varname></term>
+
+ <listitem><para>This property describes the device installation location. Different schemes are
+ used depending on the bus type, as described in the table below. For BCMA and USB devices, PCI path
+ information must known, and the full name consists of the prefix, PCI slot identifier, and USB or
+ BCMA location. The first two parts are denoted as "…" in the table below.</para>
+
+ <table>
+ <title>Path naming schemes</title>
+
+ <tgroup cols='2'>
+ <thead>
+ <row>
+ <entry>Format</entry>
+ <entry>Description</entry>
+ </row>
+ </thead>
+
+ <tbody>
+ <row>
+ <entry><replaceable>prefix</replaceable> <constant>c</constant><replaceable>bus_id</replaceable></entry>
+ <entry>CCW or grouped CCW device identifier</entry>
+ </row>
+
+ <row>
+ <entry><replaceable>prefix</replaceable> <constant>a</constant><replaceable>vendor</replaceable> <replaceable>model</replaceable> <constant>i</constant><replaceable>instance</replaceable></entry>
+ <entry>ACPI path names for ARM64 platform devices</entry>
+ </row>
+
+ <row>
+ <entry><replaceable>prefix</replaceable> <constant>i</constant><replaceable>address</replaceable> <constant>n</constant><replaceable>port_name</replaceable></entry>
+ <entry>Netdevsim (simulated networking device) device number and port name</entry>
+ </row>
+
+ <row>
+ <entry><replaceable>prefix</replaceable> [<constant>P</constant><replaceable>domain</replaceable>] <constant>p</constant><replaceable>bus</replaceable> <constant>s</constant><replaceable>slot</replaceable> [<constant>f</constant><replaceable>function</replaceable>] [<constant>n</constant><replaceable>phys_port_name</replaceable> | <constant>d</constant><replaceable>dev_port</replaceable>]</entry>
+ <entry>PCI geographical location</entry>
+ </row>
+
+ <row>
+ <entry>… <constant>b</constant><replaceable>number</replaceable></entry>
+ <entry>Broadcom bus (BCMA) core number</entry>
+ </row>
+
+ <row>
+ <entry>… <constant>u</constant><replaceable>port</replaceable>… [<constant>c</constant><replaceable>config</replaceable>] [<constant>i</constant><replaceable>interface</replaceable>]</entry>
+ <entry>USB port number chain</entry>
+ </row>
+
+ </tbody>
+ </tgroup>
+ </table>
+
+ <para>CCW and grouped CCW devices are found in IBM System Z mainframes. Any leading zeros and
+ dots are suppressed.</para>
+
+ <para>For PCI, BCMA, and USB devices, the same rules as described above for slot naming are
+ used.</para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+
+ <refsect1>
+ <title>History</title>
+
+ <para>The following "naming schemes" have been defined (which may be chosen at system boot-up time via
+ the <varname>net.naming-scheme=</varname> kernel command line switch, see above:</para>
+
+ <variablelist>
+ <varlistentry>
+ <term><constant>v238</constant></term>
+
+ <listitem><para>This is the naming scheme that was implemented in systemd 238.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><constant>v239</constant></term>
+
+ <listitem><para>Naming was changed for virtual network interfaces created with SR-IOV and NPAR and
+ for devices where the PCI network controller device does not have a slot number associated.</para>
+
+ <para>SR-IOV virtual devices are named based on the name of the parent interface, with a suffix of
+ <literal>v<replaceable>port</replaceable></literal>, where <replaceable>port</replaceable> is the
+ virtual device number. Previously those virtual devices were named as if completely independent.
+ </para>
+
+ <para>The ninth and later NPAR virtual devices are named following the scheme used for the first
+ eight NPAR partitions. Previously those devices were not renamed and the kernel default
+ ("eth<replaceable>N</replaceable>") was used.</para>
+
+ <para>Names are also generated for PCI devices where the PCI network controller device does not
+ have an associated slot number itself, but one of its parents does. Previously those devices were
+ not renamed and the kernel default was used.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><constant>v240</constant></term>
+
+ <listitem><para>The <literal>ib</literal> prefix and stable names for infiniband devices are
+ introduced. Previously those devices were not renamed.</para>
+
+ <para>The ACPI index field (used in <varname>ID_NET_NAME_ONBOARD=</varname>) is now also used when
+ 0.</para>
+
+ <para>A new naming policy <varname>NamePolicy=keep</varname> was introduced. With this policy, if
+ the network device name was already set by userspace, the device will not be renamed
+ again. Previously, this naming policy applied implicitly, and now it must be explicitly
+ requested. Effectively, this means that network devices will be renamed according to the
+ configuration, even if they have been renamed already, if <constant>keep</constant> is not
+ specified as the naming policy in the <filename index="false">.link</filename> file. See
+ <citerefentry><refentrytitle>systemd.link</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+ for a description of <varname>NamePolicy=</varname>.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><constant>v241</constant></term>
+
+ <listitem><para><option>MACAddressPolicy=persistent</option> was extended to set MAC addresses
+ based on the device name. Previously addresses were only based on the
+ <varname index="false">ID_NET_NAME_*</varname> attributes, which meant that interface names would
+ never be generated for virtual devices. Now a persistent address will be generated for most
+ devices, including in particular bridges.</para>
+
+ <para>Note: when userspace does not set a MAC address for a bridge device, the kernel will
+ initially assign a random address, and then change it when the first device is enslaved to the
+ bridge. With this naming policy change, bridges get a persistent MAC address based on the bridge
+ name instead of the first enslaved device.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><constant>v243</constant></term>
+
+ <listitem><para>Support for renaming netdevsim (simulated networking) devices was added. Previously
+ those devices were not renamed.</para>
+
+ <para>Previously two-letter interface type prefix was prepended to
+ <varname>ID_NET_LABEL_ONBOARD=</varname>. This is not done anymore.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><constant>v245</constant></term>
+
+ <listitem><para>When
+ <citerefentry><refentrytitle>systemd-nspawn</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+ derives the name for the host side of the network interface created with
+ <option>--network-veth</option> from the container name it previously simply truncated the result
+ at 15 characters if longer (since that's the maximum length for network interface names). From now
+ on, for any interface name that would be longer than 15 characters the last 4 characters are set to
+ a 24bit hash value of the full interface name. This way network interface name collisions between
+ multiple similarly named containers (who only differ in container name suffix) should be less
+ likely (but still possible, since the 24bit hash value is very small).</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><constant>v247</constant></term>
+
+ <listitem><para>If the PCI slot is associated with PCI bridge and that has multiple child network
+ controllers then all of them might derive the same value of <varname>ID_NET_NAME_SLOT</varname>
+ property. That could cause naming conflict if the property is selected as a device name. Now, we detect the
+ situation, slot - bridge relation, and we don't produce the <varname>ID_NET_NAME_SLOT</varname> property to
+ avoid possible naming conflict.</para></listitem>
+ </varlistentry>
+
+ </variablelist>
+
+ <para>Note that <constant>latest</constant> may be used to denote the latest scheme known (to this
+ particular version of systemd).</para>
+ </refsect1>
+
+ <refsect1>
+ <title>Examples</title>
+
+ <example>
+ <title>Using <command>udevadm test-builtin</command> to display device properties</title>
+
+ <programlisting>$ udevadm test-builtin net_id /sys/class/net/enp0s31f6
+...
+Using default interface naming scheme 'v243'.
+ID_NET_NAMING_SCHEME=v243
+ID_NET_NAME_MAC=enx54ee75cb1dc0
+ID_OUI_FROM_DATABASE=Wistron InfoComm(Kunshan)Co.,Ltd.
+ID_NET_NAME_PATH=enp0s31f6
+...</programlisting>
+ </example>
+
+ <example>
+ <title>PCI Ethernet card with firmware index "1"</title>
+
+ <programlisting>ID_NET_NAME_ONBOARD=eno1
+ID_NET_NAME_ONBOARD_LABEL=Ethernet Port 1
+ </programlisting>
+ </example>
+
+ <example>
+ <title>PCI Ethernet card in hotplug slot with firmware index number</title>
+
+ <programlisting># /sys/devices/pci0000:00/0000:00:1c.3/0000:05:00.0/net/ens1
+ID_NET_NAME_MAC=enx000000000466
+ID_NET_NAME_PATH=enp5s0
+ID_NET_NAME_SLOT=ens1</programlisting>
+ </example>
+
+ <example>
+ <title>PCI Ethernet multi-function card with 2 ports</title>
+
+ <programlisting># /sys/devices/pci0000:00/0000:00:1c.0/0000:02:00.0/net/enp2s0f0
+ID_NET_NAME_MAC=enx78e7d1ea46da
+ID_NET_NAME_PATH=enp2s0f0
+
+# /sys/devices/pci0000:00/0000:00:1c.0/0000:02:00.1/net/enp2s0f1
+ID_NET_NAME_MAC=enx78e7d1ea46dc
+ID_NET_NAME_PATH=enp2s0f1</programlisting>
+ </example>
+
+ <example>
+ <title>PCI WLAN card</title>
+
+ <programlisting># /sys/devices/pci0000:00/0000:00:1c.1/0000:03:00.0/net/wlp3s0
+ID_NET_NAME_MAC=wlx0024d7e31130
+ID_NET_NAME_PATH=wlp3s0</programlisting>
+ </example>
+
+ <example>
+ <title>PCI IB host adapter with 2 ports</title>
+
+ <programlisting># /sys/devices/pci0000:00/0000:00:03.0/0000:15:00.0/net/ibp21s0f0
+ID_NET_NAME_PATH=ibp21s0f0
+
+# /sys/devices/pci0000:00/0000:00:03.0/0000:15:00.1/net/ibp21s0f1
+ID_NET_NAME_PATH=ibp21s0f1</programlisting>
+ </example>
+
+ <example>
+ <title>USB built-in 3G modem</title>
+
+ <programlisting># /sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4/2-1.4:1.6/net/wwp0s29u1u4i6
+ID_NET_NAME_MAC=wwx028037ec0200
+ID_NET_NAME_PATH=wwp0s29u1u4i6</programlisting>
+ </example>
+
+ <example>
+ <title>USB Android phone</title>
+
+ <programlisting># /sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.0/net/enp0s29u1u2
+ID_NET_NAME_MAC=enxd626b3450fb5
+ID_NET_NAME_PATH=enp0s29u1u2</programlisting>
+ </example>
+
+ <example>
+ <title>s390 grouped CCW interface</title>
+
+ <programlisting># /sys/devices/css0/0.0.0007/0.0.f5f0/group_device/net/encf5f0
+ID_NET_NAME_MAC=enx026d3c00000a
+ID_NET_NAME_PATH=encf5f0</programlisting>
+ </example>
+ </refsect1>
+
+ <refsect1>
+ <title>See Also</title>
+ <para>
+ <citerefentry><refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>udevadm</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+ <ulink url="https://systemd.io/PREDICTABLE_INTERFACE_NAMES">Predictable Network Interface Names</ulink>,
+ <citerefentry><refentrytitle>systemd-nspawn</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+ </para>
+ </refsect1>
+
+</refentry>