man/systemd.network.xml

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   8   Copyright 2013 Tom Gundersen
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  23
  24 <refentry id="systemd.network" conditional='ENABLE_NETWORKD'>
  25
  26   <refentryinfo>
  27     <title>systemd.network</title>
  28     <productname>systemd</productname>
  29
  30     <authorgroup>
  31       <author>
  32         <contrib>Developer</contrib>
  33         <firstname>Tom</firstname>
  34         <surname>Gundersen</surname>
  35         <email>teg@jklm.no</email>
  36       </author>
  37     </authorgroup>
  38   </refentryinfo>
  39
  40   <refmeta>
  41     <refentrytitle>systemd.network</refentrytitle>
  42     <manvolnum>5</manvolnum>
  43   </refmeta>
  44
  45   <refnamediv>
  46     <refname>systemd.network</refname>
  47     <refpurpose>Network configuration</refpurpose>
  48   </refnamediv>
  49
  50   <refsynopsisdiv>
  51     <para><filename><replaceable>network</replaceable>.network</filename></para>
  52   </refsynopsisdiv>
  53
  54   <refsect1>
  55     <title>Description</title>
  56
  57     <para>Network setup is performed by
  58     <citerefentry><refentrytitle>systemd-networkd</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
  59     </para>
  60
  61     <para>Network files must have the extension
  62     <filename>.network</filename>; other extensions are ignored.
  63     Networks are applied to links whenever the links appear.</para>
  64
  65     <para>The <filename>.network</filename> files are read from the
  66     files located in the system network directory
  67     <filename>/usr/lib/systemd/network</filename>, the volatile
  68     runtime network directory
  69     <filename>/run/systemd/network</filename> and the local
  70     administration network directory
  71     <filename>/etc/systemd/network</filename>. All configuration files
  72     are collectively sorted and processed in lexical order, regardless
  73     of the directories in which they live. However, files with
  74     identical filenames replace each other. Files in
  75     <filename>/etc</filename> have the highest priority, files in
  76     <filename>/run</filename> take precedence over files with the same
  77     name in <filename>/usr/lib</filename>. This can be used to
  78     override a system-supplied configuration file with a local file if
  79     needed; a symlink in <filename>/etc</filename> with the same name
  80     as a configuration file in <filename>/usr/lib</filename>, pointing
  81     to <filename>/dev/null</filename>, disables the configuration file
  82     entirely.</para>
  83
  84   </refsect1>
  85
  86   <refsect1>
  87     <title>[Match] Section Options</title>
  88
  89       <para>The network file contains a <literal>[Match]</literal>
  90       section, which determines if a given network file may be applied
  91       to a given device; and a <literal>[Network]</literal> section
  92       specifying how the device should be configured. The first (in
  93       lexical order) of the network files that matches a given device
  94       is applied.</para>
  95
  96       <para>A network file is said to match a device if each of the
  97       entries in the <literal>[Match]</literal> section matches, or if
  98       the section is empty. The following keys are accepted:</para>
  99
 100       <variablelist class='network-directives'>
 101         <varlistentry>
 102           <term><varname>MACAddress=</varname></term>
 103           <listitem>
 104             <para>The hardware address.</para>
 105           </listitem>
 106         </varlistentry>
 107         <varlistentry>
 108           <term><varname>Path=</varname></term>
 109           <listitem>
 110             <para>A whitespace-separated list of shell-style globs
 111             matching the persistent path, as exposed by the udev
 112             property <literal>ID_PATH</literal>.</para>
 113           </listitem>
 114         </varlistentry>
 115         <varlistentry>
 116           <term><varname>Driver=</varname></term>
 117           <listitem>
 118             <para>A whitespace-separated list of shell-style globs
 119             matching the driver currently bound to the device, as
 120             exposed by the udev property <literal>DRIVER</literal>
 121             of its parent device, or if that is not set the driver
 122             as exposed by <literal>ethtool -i</literal> of the
 123             device itself.</para>
 124           </listitem>
 125         </varlistentry>
 126         <varlistentry>
 127           <term><varname>Type=</varname></term>
 128           <listitem>
 129             <para>A whitespace-separated list of shell-style globs
 130             matching the device type, as exposed by the udev property
 131             <literal>DEVTYPE</literal>.</para>
 132           </listitem>
 133         </varlistentry>
 134         <varlistentry>
 135           <term><varname>Name=</varname></term>
 136           <listitem>
 137             <para>A whitespace-separated list of shell-style globs
 138             matching the device name, as exposed by the udev property
 139             <literal>INTERFACE</literal>.</para>
 140           </listitem>
 141         </varlistentry>
 142         <varlistentry>
 143           <term><varname>Host=</varname></term>
 144           <listitem>
 145             <para>Matches against the hostname or machine ID of the
 146             host. See <literal>ConditionHost=</literal> in
 147             <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
 148             for details.
 149             </para>
 150           </listitem>
 151         </varlistentry>
 152         <varlistentry>
 153           <term><varname>Virtualization=</varname></term>
 154           <listitem>
 155             <para>Checks whether the system is executed in a virtualized
 156             environment and optionally test whether it is a specific
 157             implementation. See <literal>ConditionVirtualization=</literal> in
 158             <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
 159             for details.
 160             </para>
 161           </listitem>
 162         </varlistentry>
 163         <varlistentry>
 164           <term><varname>KernelCommandLine=</varname></term>
 165           <listitem>
 166             <para>Checks whether a specific kernel command line option is
 167             set (or if prefixed with the exclamation mark unset). See
 168             <literal>ConditionKernelCommandLine=</literal> in
 169             <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
 170             for details.
 171             </para>
 172           </listitem>
 173         </varlistentry>
 174         <varlistentry>
 175           <term><varname>Architecture=</varname></term>
 176           <listitem>
 177             <para>Checks whether the system is running on a specific
 178             architecture. See <literal>ConditionArchitecture=</literal> in
 179             <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
 180             for details.
 181             </para>
 182           </listitem>
 183         </varlistentry>
 184       </variablelist>
 185
 186   </refsect1>
 187
 188   <refsect1>
 189     <title>[Link] Section Options</title>
 190
 191     <para> The <literal>[Link]</literal> section accepts the following keys:</para>
 192
 193     <variablelist class='network-directives'>
 194       <varlistentry>
 195         <term><varname>MACAddress=</varname></term>
 196         <listitem>
 197           <para>The hardware address.</para>
 198         </listitem>
 199       </varlistentry>
 200       <varlistentry>
 201         <term><varname>MTUBytes=</varname></term>
 202         <listitem>
 203           <para>The maximum transmission unit in bytes to set for the
 204           device. The usual suffixes K, M, G, are supported and are
 205           understood to the base of 1024.</para>
 206         </listitem>
 207       </varlistentry>
 208     </variablelist>
 209   </refsect1>
 210
 211   <refsect1>
 212     <title>[Network] Section Options</title>
 213
 214       <para>The <literal>[Network]</literal> section accepts the following keys:</para>
 215
 216       <variablelist class='network-directives'>
 217         <varlistentry>
 218           <term><varname>Description=</varname></term>
 219           <listitem>
 220             <para>A description of the device. This is only used for
 221             presentation purposes.</para>
 222           </listitem>
 223         </varlistentry>
 224         <varlistentry>
 225           <term><varname>DHCP=</varname></term>
 226           <listitem>
 227             <para>Enables DHCPv4 and/or DHCPv6 support. Accepts
 228             <literal>yes</literal>, <literal>no</literal>,
 229             <literal>ipv4</literal>, or <literal>ipv6</literal>.</para>
 230           </listitem>
 231         </varlistentry>
 232         <varlistentry>
 233           <term><varname>DHCPServer=</varname></term>
 234           <listitem>
 235             <para>A boolean. Enables a basic DHCPv4 server on the
 236             device. Mostly useful for handing out leases to container
 237             instances.</para>
 238           </listitem>
 239         </varlistentry>
 240         <varlistentry>
 241           <term><varname>LinkLocalAddressing=</varname></term>
 242           <listitem>
 243             <para>Enables link-local address autoconfiguration. Accepts
 244             <literal>yes</literal>, <literal>no</literal>,
 245             <literal>ipv4</literal>, or <literal>ipv6</literal>. Defaults to
 246             <literal>ipv6</literal>.</para>
 247           </listitem>
 248         </varlistentry>
 249         <varlistentry>
 250           <term><varname>IPv4LLRoute=</varname></term>
 251           <listitem>
 252             <para>A boolean. When true, sets up the route needed for
 253             non-IPv4LL hosts to communicate with IPv4LL-only hosts. Defaults
 254             to false.
 255             </para>
 256           </listitem>
 257         </varlistentry>
 258         <varlistentry>
 259           <term><varname>IPv6Token=</varname></term>
 260           <listitem>
 261             <para>An IPv6 address with the top 64 bits unset. When set, indicates the
 262             64 bits interface part of SLAAC IPv6 addresses for this link. By default
 263             it is autogenerated.</para>
 264           </listitem>
 265         </varlistentry>
 266         <varlistentry>
 267           <term><varname>LLMNR=</varname></term>
 268           <listitem>
 269             <para>A boolean or <literal>resolve</literal>. When true, enables
 270             Link-Local Multicast Name Resolution on the link, when set to
 271             <literal>resolve</literal> only resolution is enabled, but not
 272             announcement. Defaults to true.</para>
 273           </listitem>
 274         </varlistentry>
 275         <varlistentry>
 276           <term><varname>LLDP=</varname></term>
 277           <listitem>
 278             <para>A boolean. When true, enables LLDP link receive support.
 279             </para>
 280           </listitem>
 281         </varlistentry>
 282         <varlistentry>
 283           <term><varname>BindCarrier=</varname></term>
 284           <listitem>
 285             <para>A port or a list of ports. When set, controls the
 286             behaviour of the current interface. When all ports in the list
 287             are in an operational down state, the current interface is brought
 288             down. When at least one port has carrier, the current interface
 289             is brought up.
 290             </para>
 291           </listitem>
 292         </varlistentry>
 293         <varlistentry>
 294           <term><varname>Address=</varname></term>
 295           <listitem>
 296             <para>A static IPv4 or IPv6 address and its prefix length,
 297             separated by a <literal>/</literal> character. Specify
 298             this key more than once to configure several addresses.
 299             The format of the address must be as described in
 300             <citerefentry><refentrytitle>inet_pton</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
 301             This is a short-hand for an [Address] section only
 302             containing an Address key (see below). This option may be
 303             specified more than once.
 304             </para>
 305
 306             <para>If the specified address is 0.0.0.0 (for IPv4) or
 307             [::] (for IPv6), a new address range of the requested size
 308             is automatically allocated from a system-wide pool of
 309             unused ranges. The allocated range is checked against all
 310             current network interfaces and all known network
 311             configuration files to avoid address range conflicts. The
 312             default system-wide pool consists of 192.168.0.0/16,
 313             172.16.0.0/12 and 10.0.0.0/8 for IPv4, and fc00::/7 for
 314             IPv6. This functionality is useful to manage a large
 315             number of dynamically created network interfaces with the
 316             same network configuration and automatic address range
 317             assignment.</para>
 318
 319           </listitem>
 320         </varlistentry>
 321         <varlistentry>
 322           <term><varname>Gateway=</varname></term>
 323           <listitem>
 324             <para>The gateway address, which must be in the format
 325             described in
 326             <citerefentry><refentrytitle>inet_pton</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
 327             This is a short-hand for a [Route] section only containing
 328             a Gateway key. This option may be specified more than
 329             once.</para>
 330           </listitem>
 331         </varlistentry>
 332         <varlistentry>
 333           <term><varname>DNS=</varname></term>
 334           <listitem>
 335             <para>A DNS server address, which must be in the format
 336             described in
 337             <citerefentry><refentrytitle>inet_pton</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
 338             This option may be specified more than once.</para>
 339           </listitem>
 340         </varlistentry>
 341         <varlistentry>
 342           <term><varname>Domains=</varname></term>
 343           <listitem>
 344             <para>The domains used for DNS resolution over this link.</para>
 345           </listitem>
 346         </varlistentry>
 347         <varlistentry>
 348           <term><varname>NTP=</varname></term>
 349           <listitem>
 350             <para>An NTP server address. This option may be specified more than once.</para>
 351           </listitem>
 352         </varlistentry>
 353         <varlistentry>
 354           <term><varname>IPForward=</varname></term>
 355           <listitem><para>Configures IP forwarding for the network
 356           interface. If enabled incoming packets on the network
 357           interface will be forwarded to other interfaces according to
 358           the routing table. Takes either a boolean argument, or the
 359           values <literal>ipv4</literal> or <literal>ipv6</literal>,
 360           which only enables IP forwarding for the specified address
 361           family.</para></listitem>
 362         </varlistentry>
 363         <varlistentry>
 364           <term><varname>IPMasquerade=</varname></term>
 365           <listitem><para>Configures IP masquerading for the network
 366           interface. If enabled packets forwarded from the network
 367           interface will be appear as coming from the local host.
 368           Takes a boolean argument. Implies
 369           <varname>IPForward=yes</varname>.</para></listitem>
 370         </varlistentry>
 371         <varlistentry>
 372           <term><varname>Bridge=</varname></term>
 373           <listitem>
 374             <para>The name of the bridge to add the link to.</para>
 375           </listitem>
 376         </varlistentry>
 377         <varlistentry>
 378           <term><varname>Bond=</varname></term>
 379           <listitem>
 380             <para>The name of the bond to add the link to.</para>
 381           </listitem>
 382         </varlistentry>
 383         <varlistentry>
 384           <term><varname>VLAN=</varname></term>
 385           <listitem>
 386             <para>The name of a VLAN to create on the link. This
 387             option may be specified more than once.</para>
 388           </listitem>
 389         </varlistentry>
 390         <varlistentry>
 391           <term><varname>MACVLAN=</varname></term>
 392           <listitem>
 393             <para>The name of a MACVLAN to create on the link. This
 394             option may be specified more than once.</para>
 395           </listitem>
 396         </varlistentry>
 397         <varlistentry>
 398           <term><varname>VXLAN=</varname></term>
 399           <listitem>
 400             <para>The name of a VXLAN to create on the link. This
 401             option may be specified more than once.</para>
 402           </listitem>
 403         </varlistentry>
 404         <varlistentry>
 405           <term><varname>Tunnel=</varname></term>
 406           <listitem>
 407             <para>The name of a Tunnel to create on the link. This
 408             option may be specified more than once.</para>
 409           </listitem>
 410         </varlistentry>
 411       </variablelist>
 412
 413   </refsect1>
 414
 415   <refsect1>
 416     <title>[Address] Section Options</title>
 417
 418       <para>An <literal>[Address]</literal> section accepts the
 419       following keys. Specify several <literal>[Address]</literal>
 420       sections to configure several addresses.</para>
 421
 422       <variablelist class='network-directives'>
 423         <varlistentry>
 424           <term><varname>Address=</varname></term>
 425           <listitem>
 426             <para>As in the <literal>[Network]</literal> section. This
 427             key is mandatory.</para>
 428           </listitem>
 429         </varlistentry>
 430         <varlistentry>
 431           <term><varname>Peer=</varname></term>
 432           <listitem>
 433             <para>The peer address in a point-to-point connection.
 434             Accepts the same format as the <literal>Address</literal>
 435             key.</para>
 436           </listitem>
 437         </varlistentry>
 438         <varlistentry>
 439           <term><varname>Broadcast=</varname></term>
 440           <listitem>
 441             <para>The broadcast address, which must be in the format
 442             described in
 443             <citerefentry><refentrytitle>inet_pton</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
 444             This key only applies to IPv4 addresses. If it is not
 445             given, it is derived from the <literal>Address</literal>
 446             key.</para>
 447           </listitem>
 448         </varlistentry>
 449         <varlistentry>
 450           <term><varname>Label=</varname></term>
 451           <listitem>
 452             <para>An address label.</para>
 453           </listitem>
 454         </varlistentry>
 455       </variablelist>
 456   </refsect1>
 457
 458   <refsect1>
 459     <title>[Route] Section Options</title>
 460       <para>The <literal>[Route]</literal> section accepts the
 461       following keys. Specify several <literal>[Route]</literal>
 462       sections to configure several routes.</para>
 463
 464       <variablelist class='network-directives'>
 465         <varlistentry>
 466           <term><varname>Gateway=</varname></term>
 467           <listitem>
 468             <para>As in the <literal>[Network]</literal> section.</para>
 469           </listitem>
 470         </varlistentry>
 471         <varlistentry>
 472           <term><varname>Destination=</varname></term>
 473           <listitem>
 474             <para>The destination prefix of the route. Possibly
 475             followed by a slash and the prefixlength. If omitted, a
 476             full-length host route is assumed.</para>
 477           </listitem>
 478         </varlistentry>
 479         <varlistentry>
 480           <term><varname>Source=</varname></term>
 481           <listitem>
 482             <para>The source prefix of the route. Possibly followed by
 483             a slash and the prefixlength. If omitted, a full-length
 484             host route is assumed.</para>
 485           </listitem>
 486         </varlistentry>
 487         <varlistentry>
 488           <term><varname>Metric=</varname></term>
 489           <listitem>
 490             <para>The metric of the route. An unsigned integer</para>
 491           </listitem>
 492         </varlistentry>
 493         <varlistentry>
 494           <term><varname>Scope=</varname></term>
 495           <listitem>
 496             <para>The scope of the route. One of the values <literal>global</literal>,
 497             <literal>link</literal> or <literal>host</literal>. Defaults to
 498             <literal>global</literal>.</para>
 499           </listitem>
 500         </varlistentry>
 501       </variablelist>
 502   </refsect1>
 503
 504   <refsect1>
 505     <title>[DHCP] Section Options</title>
 506       <para>The <literal>[DHCP]</literal> section accepts the following keys:</para>
 507
 508       <variablelist class='network-directives'>
 509         <varlistentry>
 510           <term><varname>UseDNS=</varname></term>
 511           <listitem>
 512             <para>When true (the default), the DNS servers received
 513             from the DHCP server will be used and take precedence over
 514             any statically configured ones.</para>
 515           </listitem>
 516         </varlistentry>
 517         <varlistentry>
 518           <term><varname>UseMTU=</varname></term>
 519           <listitem>
 520             <para>When true, the interface maximum transmission unit
 521             from the DHCP server will be used on the current link.
 522             Defaults to false.</para>
 523           </listitem>
 524         </varlistentry>
 525         <varlistentry>
 526           <term><varname>SendHostname=</varname></term>
 527           <listitem>
 528             <para>When true (the default), the machine's hostname will be sent to the DHCP
 529             server</para>
 530           </listitem>
 531         </varlistentry>
 532         <varlistentry>
 533           <term><varname>UseHostname=</varname></term>
 534           <listitem>
 535             <para>When true (the default), the hostname received from
 536             the DHCP server will be used as the transient
 537             hostname.</para>
 538           </listitem>
 539         </varlistentry>
 540         <varlistentry>
 541           <term><varname>UseDomains=</varname></term>
 542           <listitem>
 543             <para>When true (not the default), the domain name
 544             received from the DHCP server will be used for DNS
 545             resolution over this link.</para>
 546           </listitem>
 547         </varlistentry>
 548         <varlistentry>
 549           <term><varname>UseRoutes=</varname></term>
 550           <listitem>
 551             <para>When true (the default), the static routes will be
 552             requested from the DHCP server and added to the routing
 553             table with metric of 1024.</para>
 554           </listitem>
 555         </varlistentry>
 556         <varlistentry>
 557           <term><varname>CriticalConnection=</varname></term>
 558           <listitem>
 559             <para>When true, the connection will never be torn down
 560             even if the DHCP lease expires. This is contrary to the
 561             DHCP specification, but may be the best choice if, say,
 562             the root filesystem relies on this connection. Defaults to
 563             false.</para>
 564           </listitem>
 565         </varlistentry>
 566         <varlistentry>
 567           <term><varname>VendorClassIdentifier=</varname></term>
 568           <listitem>
 569             <para>The vendor class identifier used to identify vendor
 570             type and configuration.</para>
 571           </listitem>
 572         </varlistentry>
 573         <varlistentry>
 574           <term><varname>RequestBroadcast=</varname></term>
 575           <listitem>
 576             <para>Request the server to use broadcast messages before
 577             the IP address has been configured. This is necessary for
 578             devices that cannot receive RAW packets, or that cannot
 579             receive packets at all before an IP address has been
 580             configured. On the other hand, this must not be enabled on
 581             networks where broadcasts are filtered out.</para>
 582           </listitem>
 583         </varlistentry>
 584         <varlistentry>
 585           <term><varname>RouteMetric=</varname></term>
 586           <listitem>
 587             <para>Set the routing metric for routes specified by the
 588             DHCP server.</para>
 589           </listitem>
 590         </varlistentry>
 591            </variablelist>
 592
 593   </refsect1>
 594
 595   <refsect1>
 596     <title>[Bridge] Section Options</title>
 597       <para>The <literal>[Bridge]</literal> section accepts the
 598       following keys.</para>
 599       <variablelist class='network-directives'>
 600         <varlistentry>
 601           <term><varname>Cost=</varname></term>
 602           <listitem>
 603             <para>Each port in a bridge may have different speed. Cost
 604             is used to decide which link to use. Faster interfaces
 605             should have lower costs</para>
 606           </listitem>
 607         </varlistentry>
 608       </variablelist>
 609   </refsect1>
 610
 611   <refsect1>
 612     <title>[BridgeFDB] Section Options</title>
 613       <para>The <literal>[BridgeFDB]</literal> section manages the
 614       forwarding database table of a port and accepts the following
 615       keys. Specify several <literal>[BridgeFDB]</literal> sections to
 616       configure several static MAC table entries.</para>
 617
 618       <variablelist class='network-directives'>
 619         <varlistentry>
 620           <term><varname>MACAddress=</varname></term>
 621           <listitem>
 622             <para>As in the <literal>[Network]</literal> section. This
 623             key is mandatory.</para>
 624           </listitem>
 625         </varlistentry>
 626         <varlistentry>
 627           <term><varname>VLANId=</varname></term>
 628           <listitem>
 629             <para>The VLAN Id for the new static MAC table entry. If
 630             omitted, no VLAN Id info is appended to the new static MAC
 631             table entry.</para>
 632           </listitem>
 633         </varlistentry>
 634       </variablelist>
 635   </refsect1>
 636
 637   <refsect1>
 638     <title>Example</title>
 639     <example>
 640       <title>/etc/systemd/network/50-static.network</title>
 641
 642       <programlisting>[Match]
 643 Name=enp2s0
 644
 645 [Network]
 646 Address=192.168.0.15/24
 647 Gateway=192.168.0.1</programlisting>
 648     </example>
 649
 650     <example>
 651       <title>/etc/systemd/network/80-dhcp.network</title>
 652
 653       <programlisting>[Match]
 654 Name=en*
 655
 656 [Network]
 657 DHCP=both</programlisting>
 658     </example>
 659
 660     <example>
 661       <title>/etc/systemd/network/bridge-static.network</title>
 662
 663       <programlisting>[Match]
 664 Name=bridge0
 665
 666 [Network]
 667 Address=192.168.0.15/24
 668 Gateway=192.168.0.1
 669 DNS=192.168.0.1</programlisting>
 670     </example>
 671
 672     <example>
 673       <title>/etc/systemd/network/bridge-slave-interface.network</title>
 674
 675       <programlisting>[Match]
 676 Name=enp2s0
 677
 678 [Network]
 679 Bridge=bridge0</programlisting>
 680     </example>
 681     <example>
 682       <title>/etc/systemd/network/ipip.network</title>
 683
 684       <programlisting>[Match]
 685 Name=em1
 686
 687 [Network]
 688 Tunnel=ipip-tun</programlisting>
 689     </example>
 690
 691     <example>
 692       <title>/etc/systemd/network/sit.network</title>
 693
 694       <programlisting>[Match]
 695 Name=em1
 696
 697 [Network]
 698 Tunnel=sit-tun</programlisting>
 699     </example>
 700
 701     <example>
 702       <title>/etc/systemd/network/gre.network</title>
 703
 704       <programlisting>[Match]
 705 Name=em1
 706
 707 [Network]
 708 Tunnel=gre-tun</programlisting>
 709     </example>
 710
 711     <example>
 712       <title>/etc/systemd/network/vti.network</title>
 713
 714       <programlisting>[Match]
 715 Name=em1
 716
 717 [Network]
 718 Tunnel=vti-tun</programlisting>
 719     </example>
 720   </refsect1>
 721
 722   <refsect1>
 723     <title>See Also</title>
 724     <para>
 725       <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 726       <citerefentry><refentrytitle>systemd-networkd</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 727       <citerefentry><refentrytitle>systemd.link</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 728       <citerefentry><refentrytitle>systemd.netdev</refentrytitle><manvolnum>5</manvolnum></citerefentry>
 729     </para>
 730   </refsect1>
 731
 732 </refentry>