man/systemd.netdev.xml

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   2 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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   8   Copyright 2013 Tom Gundersen
   9
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  23
  24 <refentry id="systemd.netdev" 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.netdev</refentrytitle>
  42                 <manvolnum>5</manvolnum>
  43         </refmeta>
  44
  45         <refnamediv>
  46                 <refname>systemd.netdev</refname>
  47                 <refpurpose>Virtual Network Device configuration</refpurpose>
  48         </refnamediv>
  49
  50         <refsynopsisdiv>
  51                 <para><filename><replaceable>netdev</replaceable>.netdev</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>Virtual Network Device files must have the extension
  62                 <filename>.netdev</filename>; other extensions are ignored. Virtual
  63                 network devices are created as soon as networkd is started. If a netdev
  64                 with the specified name already exists, networkd will use that as-is
  65                 rather than create its own. Note that the settings of the pre-existing
  66                 netdev will not be changed by networkd.</para>
  67
  68                 <para>The <filename>.netdev</filename> files are read from the files located in the
  69                 system network directory <filename>/usr/lib/systemd/network</filename>,
  70                 the volatile runtime network directory
  71                 <filename>/run/systemd/network</filename> and the local administration
  72                 network directory <filename>/etc/systemd/network</filename>.
  73                 All configuration files are collectively sorted and processed in lexical order,
  74                 regardless of the directories in which they live. However, files with
  75                 identical filenames replace each other. Files in
  76                 <filename>/etc</filename> have the highest priority, files in
  77                 <filename>/run</filename> take precedence over files with the same
  78                 name in <filename>/usr/lib</filename>. This can be used to override a
  79                 system-supplied configuration file with a local file if needed; a symlink in
  80                 <filename>/etc</filename> with the same name as a configuration file in
  81                 <filename>/usr/lib</filename>, pointing to <filename>/dev/null</filename>,
  82                 disables the configuration file entirely.</para>
  83
  84         </refsect1>
  85
  86         <refsect1>
  87                 <title>[Match] Section Options</title>
  88
  89                 <para>A virtual network device is only created if the
  90                 <literal>[Match]</literal> section matches the current
  91                 environment, or if the section is empty. The following keys are accepted:</para>
  92
  93                         <variablelist class='network-directives'>
  94                                 <varlistentry>
  95                                         <term><varname>Host=</varname></term>
  96                                         <listitem>
  97                                                 <para>Matches against the hostname or machine ID of the
  98                                                 host. See <literal>ConditionHost=</literal> in
  99                                                 <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
 100                                                 for details.
 101                                                 </para>
 102                                         </listitem>
 103                                 </varlistentry>
 104                                 <varlistentry>
 105                                         <term><varname>Virtualization=</varname></term>
 106                                         <listitem>
 107                                                 <para>Checks whether the system is executed in a virtualized
 108                                                 environment and optionally test whether it is a specific
 109                                                 implementation. See <literal>ConditionVirtualization=</literal> in
 110                                                 <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
 111                                                 for details.
 112                                                 </para>
 113                                         </listitem>
 114                                 </varlistentry>
 115                                 <varlistentry>
 116                                         <term><varname>KernelCommandLine=</varname></term>
 117                                         <listitem>
 118                                                 <para>Checks whether a specific kernel command line option is
 119                                                 set (or if prefixed with the exclamation mark unset). See
 120                                                 <literal>ConditionKernelCommandLine=</literal> in
 121                                                 <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
 122                                                 for details.
 123                                                 </para>
 124                                         </listitem>
 125                                 </varlistentry>
 126                                 <varlistentry>
 127                                         <term><varname>Architecture=</varname></term>
 128                                         <listitem>
 129                                                 <para>Checks whether the system is running on a specific
 130                                                 architecture. See <literal>ConditionArchitecture=</literal> in
 131                                                 <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
 132                                                 for details.
 133                                                 </para>
 134                                         </listitem>
 135                                 </varlistentry>
 136                         </variablelist>
 137
 138         </refsect1>
 139
 140         <refsect1>
 141                 <title>[NetDev] Section Options</title>
 142
 143                         <para>The <literal>[NetDev]</literal> section accepts the following
 144                         keys:</para>
 145
 146                         <variablelist class='network-directives'>
 147                                 <varlistentry>
 148                                         <term><varname>Description=</varname></term>
 149                                         <listitem>
 150                                                 <para>A free-form description of the netdev.
 151                                                 </para>
 152                                         </listitem>
 153                                 </varlistentry>
 154                                 <varlistentry>
 155                                         <term><varname>Name=</varname></term>
 156                                         <listitem>
 157                                                 <para>The interface name used when creating the
 158                                                 netdev. This option is compulsory.</para>
 159                                         </listitem>
 160                                 </varlistentry>
 161                                 <varlistentry>
 162                                         <term><varname>Kind=</varname></term>
 163                                         <listitem>
 164                                                 <para>The netdev kind. Currently, <literal>bridge</literal>,
 165                                                 <literal>bond</literal>, <literal>vlan</literal>,
 166                                                 <literal>macvlan</literal>,
 167                                                 <literal>ipvlan</literal>, <literal>vxlan</literal>,
 168                                                 <literal>ipip</literal>, <literal>gre</literal>,
 169                                                 <literal>sit</literal>, <literal>vti</literal>,
 170                                                 <literal>veth</literal>, <literal>tun</literal>,
 171                                                 <literal>tap</literal> and <literal>dummy</literal>
 172                                                 are supported. This option is compulsory.</para>
 173                                         </listitem>
 174                                 </varlistentry>
 175                                 <varlistentry>
 176                                         <term><varname>MTUBytes=</varname></term>
 177                                         <listitem>
 178                                                 <para>The maximum transmission unit in bytes to
 179                                                 set for the device. The usual suffixes K, M, G,
 180                                                 are supported and are understood to the base of
 181                                                 1024. This key is not currently suported for
 182                                                 <literal>tun</literal> or <literal>tap</literal> devices.
 183                                                 </para>
 184                                         </listitem>
 185                                 </varlistentry>
 186                                 <varlistentry>
 187                                         <term><varname>MACAddress=</varname></term>
 188                                         <listitem>
 189                                                 <para>The MAC address to use for the device.
 190                                                 If none is given, one is generated based on
 191                                                 the interface name and the
 192                                                 <citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
 193                                                 This key is not currently suported for <literal>tun</literal> or <literal>tap</literal> devices.
 194                                                 </para>
 195                                         </listitem>
 196                                 </varlistentry>
 197                         </variablelist>
 198         </refsect1>
 199
 200         <refsect1>
 201                 <title>[VLAN] Section Options</title>
 202
 203                         <para>The <literal>[VLAN]</literal> section only applies for netdevs of kind <literal>vlan</literal>,
 204                         and accepts the following key:</para>
 205
 206                         <variablelist class='network-directives'>
 207                                 <varlistentry>
 208                                         <term><varname>Id=</varname></term>
 209                                         <listitem>
 210                                                 <para>The VLAN ID to use. An integer in the range 0–4094.
 211                                                 This option is compulsory.</para>
 212                                         </listitem>
 213                                 </varlistentry>
 214                         </variablelist>
 215
 216         </refsect1>
 217
 218         <refsect1>
 219                 <title>[MACVLAN] Section Options</title>
 220
 221                         <para>The <literal>[MACVLAN]</literal> section only applies for netdevs of kind
 222                         <literal>macvlan</literal>, and accepts the following key:</para>
 223
 224                         <variablelist class='network-directives'>
 225                                 <varlistentry>
 226                                         <term><varname>Mode=</varname></term>
 227                                         <listitem>
 228                                                 <para>The MACVLAN mode to use. The supported options are
 229                                                 <literal>private</literal>, <literal>vepa</literal>,
 230                                                 <literal>bridge</literal> and <literal>passthru</literal>.
 231                                                 </para>
 232                                         </listitem>
 233                                 </varlistentry>
 234                         </variablelist>
 235
 236         </refsect1>
 237
 238         <refsect1>
 239                 <title>[IPVLAN] Section Options</title>
 240
 241                         <para>The <literal>[IPVLAN]</literal> section only applies for netdevs of kind
 242                         <literal>ipvlan</literal>, and accepts the following key:</para>
 243
 244                         <variablelist class='network-directives'>
 245                                 <varlistentry>
 246                                         <term><varname>Mode=</varname></term>
 247                                         <listitem>
 248                                                 <para>The IPVLAN mode to use. The supported options are
 249                                                 <literal>L2</literal> and <literal>L3</literal>.
 250                                                 </para>
 251                                         </listitem>
 252                                 </varlistentry>
 253                         </variablelist>
 254
 255         </refsect1>
 256
 257         <refsect1>
 258                 <title>[VXLAN] Section Options</title>
 259                         <para>The <literal>[VXLAN]</literal> section only applies for netdevs of kind
 260                         <literal>vxlan</literal>, and accepts the following key:</para>
 261
 262                         <variablelist class='network-directives'>
 263                                 <varlistentry>
 264                                         <term><varname>Id=</varname></term>
 265                                         <listitem>
 266                                                 <para>The VXLAN ID to use.</para>
 267                                         </listitem>
 268                                 </varlistentry>
 269                                 <varlistentry>
 270                                         <term><varname>Group=</varname></term>
 271                                         <listitem>
 272                                                 <para>An assigned multicast group IP address.</para>
 273                                         </listitem>
 274                                 </varlistentry>
 275                                 <varlistentry>
 276                                         <term><varname>TOS=</varname></term>
 277                                         <listitem>
 278                                                 <para>The Type Of Service byte value for a vxlan interface.</para>
 279                                         </listitem>
 280                                 </varlistentry>
 281                                 <varlistentry>
 282                                         <term><varname>TTL=</varname></term>
 283                                         <listitem>
 284                                                 <para>A fixed Time To Live N on Virtual eXtensible Local Area Network packets.
 285                                                 N is a number in the range 1-255. 0 is a special value meaning that packets
 286                                                 inherit the TTL value.</para>
 287                                         </listitem>
 288                                 </varlistentry>
 289                                 <varlistentry>
 290                                         <term><varname>MacLearning=</varname></term>
 291                                         <listitem>
 292                                                 <para>A boolean. When true, enables dynamic MAC learning
 293                                                 to discover remote MAC addresses.</para>
 294                                         </listitem>
 295                                 </varlistentry>
 296                                 <varlistentry>
 297                                         <term><varname>FDBAgeingSec=</varname></term>
 298                                         <listitem>
 299                                                 <para>The lifetime of Forwarding Database entry learnt by the kernel in seconds.</para>
 300                                         </listitem>
 301                                 </varlistentry>
 302                                 <varlistentry>
 303                                         <term><varname>ARPProxy=</varname></term>
 304                                         <listitem>
 305                                                 <para>A boolean. When true, enables ARP proxy.</para>
 306                                         </listitem>
 307                                 </varlistentry>
 308                                 <varlistentry>
 309                                         <term><varname>L2MissNotification=</varname></term>
 310                                         <listitem>
 311                                                 <para>A boolean. When true, enables netlink LLADDR miss notifications.</para>
 312                                         </listitem>
 313                                 </varlistentry>
 314                                 <varlistentry>
 315                                         <term><varname>L3MissNotification=</varname></term>
 316                                         <listitem>
 317                                                 <para>A boolean. When true, enables netlink IP ADDR miss notifications.</para>
 318                                         </listitem>
 319                                 </varlistentry>
 320                                 <varlistentry>
 321                                         <term><varname>RouteShortCircuit=</varname></term>
 322                                         <listitem>
 323                                                 <para>A boolean. When true route short circuit is turned on.</para>
 324                                         </listitem>
 325                                 </varlistentry>
 326                         </variablelist>
 327         </refsect1>
 328         <refsect1>
 329                 <title>[Tunnel] Section Options</title>
 330
 331                         <para>The <literal>[Tunnel]</literal> section only applies for netdevs of kind
 332                         <literal>ipip</literal>, <literal>sit</literal>, <literal>gre</literal> and
 333                         <literal>vti</literal> and accepts the following keys:</para>
 334
 335                         <variablelist class='network-directives'>
 336                                 <varlistentry>
 337                                         <term><varname>Local=</varname></term>
 338                                         <listitem>
 339                                                 <para>A static local address for tunneled packets.
 340                                                 It must be an address on another interface of this host.</para>
 341                                         </listitem>
 342                                 </varlistentry>
 343                                 <varlistentry>
 344                                         <term><varname>Remote=</varname></term>
 345                                         <listitem>
 346                                                 <para>The remote endpoint of the tunnel.</para>
 347                                         </listitem>
 348                                 </varlistentry>
 349                                 <varlistentry>
 350                                         <term><varname>TOS=</varname></term>
 351                                         <listitem>
 352                                                 <para>The Type Of Service byte value for a tunnel interface.
 353                                                 For details about the TOS see the
 354                                                 <ulink url="http://tools.ietf.org/html/rfc1349">
 355                                                 Type of Service in the Internet Protocol Suite
 356                                                 </ulink> document.
 357                                                 </para>
 358                                         </listitem>
 359                                 </varlistentry>
 360                                 <varlistentry>
 361                                         <term><varname>TTL=</varname></term>
 362                                         <listitem>
 363                                                 <para>A fixed Time To Live N on tunneled packets.
 364                                                 N is a number in the range 1-255. 0 is a special value meaning that packets
 365                                                 inherit the TTL value. The default value for IPv4 tunnels is: inherit.
 366                                                 The default value for IPv6 tunnels is: 64.</para>
 367                                         </listitem>
 368                                 </varlistentry>
 369                                 <varlistentry>
 370                                         <term><varname>DiscoverPathMTU=</varname></term>
 371                                         <listitem>
 372                                                 <para>A boolean. When true, enables Path MTU Discovery on the tunnel.</para>
 373                                         </listitem>
 374                                 </varlistentry>
 375                         </variablelist>
 376         </refsect1>
 377         <refsect1>
 378                 <title>[Peer] Section Options</title>
 379
 380                         <para>The <literal>[Peer]</literal> section only applies for netdevs of kind <literal>veth</literal>
 381                         and accepts the following key:</para>
 382
 383                         <variablelist class='network-directives'>
 384                                 <varlistentry>
 385                                         <term><varname>Name=</varname></term>
 386                                         <listitem>
 387                                                 <para>The interface name used when creating the netdev.
 388                                                 This option is compulsory.</para>
 389                                         </listitem>
 390                                 </varlistentry>
 391                                 <varlistentry>
 392                                         <term><varname>MACAddress=</varname></term>
 393                                         <listitem>
 394                                                 <para>The peer MACAddress, if not set it is generated in the same
 395                                                 way as the MAC address of the main interface.</para>
 396                                         </listitem>
 397                                 </varlistentry>
 398                         </variablelist>
 399         </refsect1>
 400         <refsect1>
 401                 <title>[Tun] Section Options</title>
 402
 403                         <para>The <literal>[Tun]</literal> section only applies for netdevs of kind
 404                         <literal>tun</literal>, and accepts the following keys:</para>
 405
 406                         <variablelist class='network-directives'>
 407                                 <varlistentry>
 408                                         <term><varname>OneQueue=</varname></term>
 409                                         <listitem><para>Takes a boolean argument. Configures whether
 410                                         all packets are queued at the device (enabled), or a fixed number
 411                                         of packets are queued at the device and the rest at the
 412                                         <literal>qdisc</literal>. Defaults to <literal>no</literal>.</para>
 413                                         </listitem>
 414                                 </varlistentry>
 415                                 <varlistentry>
 416                                         <term><varname>MultiQueue=</varname></term>
 417                                         <listitem><para>Takes a boolean argument. Configures whether to
 418                                         use multiple file descriptors (queues) to parallelize packets
 419                                         sending and receiving. Defaults to <literal>no</literal>.</para>
 420                                         </listitem>
 421                                 </varlistentry>
 422                                 <varlistentry>
 423                                         <term><varname>PacketInfo=</varname></term>
 424                                         <listitem><para>Takes a boolean argument. Configures whether packets
 425                                         should be prepened with four extra bytes (two flag bytes and two
 426                                         protocol bytes). If disabled it indicates that the packets will be
 427                                         pure IP packets. Defaults to <literal>no</literal>.</para>
 428                                         </listitem>
 429                                 </varlistentry>
 430                                 <varlistentry>
 431                                         <term><varname>User=</varname></term>
 432                                         <listitem><para>User to grant access to the <filename>/dev/net/tun</filename>
 433                                         device.</para>
 434                                         </listitem>
 435                                 </varlistentry>
 436                                 <varlistentry>
 437                                         <term><varname>Group=</varname></term>
 438                                         <listitem><para>Group to grant access to the <filename>/dev/net/tun</filename>
 439                                         device.</para>
 440                                         </listitem>
 441                                 </varlistentry>
 442
 443                         </variablelist>
 444
 445         </refsect1>
 446
 447         <refsect1>
 448                 <title>[Tap] Section Options</title>
 449
 450                         <para>The <literal>[Tap]</literal> section only applies for netdevs of kind
 451                         <literal>tap</literal>, and accepts the same keys as the
 452                         <literal>[Tun]</literal> section.</para>
 453         </refsect1>
 454
 455         <refsect1>
 456                 <title>[Bond] Section Options</title>
 457
 458                         <para>The <literal>[Bond]</literal> section accepts the following
 459                         key:</para>
 460
 461                         <variablelist class='network-directives'>
 462                                 <varlistentry>
 463                                         <term><varname>Mode=</varname></term>
 464                                         <listitem>
 465                                           <para>Specifies one of the bonding policies. The default is
 466                                           <literal>balance-rr</literal> (round robin). Possible values are
 467                                                 <literal>balance-rr</literal>,
 468                                                 <literal>active-backup</literal>,
 469                                                 <literal>balance-xor</literal>,
 470                                                 <literal>broadcast</literal>,
 471                                                 <literal>802.3ad</literal>,
 472                                                 <literal>balance-tlb</literal>, and
 473                                                 <literal>balance-alb</literal>.
 474                                           </para>
 475                                         </listitem>
 476                                 </varlistentry>
 477
 478                                 <varlistentry>
 479                                   <term><varname>TransmitHashPolicy=</varname></term>
 480                                   <listitem>
 481                                     <para>Selects the transmit hash policy to use for slave selection in
 482                                     balance-xor, 802.3ad, and tlb modes. Possible values are
 483                                     <literal>layer2</literal>,
 484                                     <literal>layer3+4</literal>,
 485                                     <literal>layer2+3</literal>,
 486                                     <literal>encap2+3</literal>,
 487                                     <literal>802.3ad</literal>, and
 488                                     <literal>encap3+4</literal>.
 489                                     </para>
 490                                   </listitem>
 491                                 </varlistentry>
 492
 493                                 <varlistentry>
 494                                   <term><varname>LACPTransmitRate=</varname></term>
 495                                   <listitem>
 496                                     <para>Specifies the rate with which link partner
 497                                     transmits Link Aggregation Control Protocol Data Unit packets
 498                                     in 802.3ad mode. Possible values are
 499                                     <literal>slow</literal>, which requests partner to transmit LACPDUs every 30 seconds, and
 500                                     <literal>fast</literal>, which requests partner to transmit LACPDUs every second.
 501                                     The default value is <literal>slow</literal>.</para>
 502                                   </listitem>
 503                                 </varlistentry>
 504
 505                                 <varlistentry>
 506                                   <term><varname>MIIMonitorSec=</varname></term>
 507                                   <listitem>
 508                                     <para>Specifies the frequency that Media Independent Interface link
 509                                     monitoring will occur. A value of zero disables MII link monitoring.
 510                                     This values is rounded down to the nearest millisecond. The default
 511                                     value is 0.</para>
 512                                   </listitem>
 513                                 </varlistentry>
 514
 515                                 <varlistentry>
 516                                   <term><varname>UpDelaySec=</varname></term>
 517                                   <listitem>
 518                                     <para>Specifies the delay before a link is enabled after a link up
 519                                     status has been detected. This value is rounded down to a multiple of
 520                                     MIIMonitorSec. The default value is 0.</para>
 521                                   </listitem>
 522                                 </varlistentry>
 523
 524                                 <varlistentry>
 525                                   <term><varname>DownDelaySec=</varname></term>
 526                                   <listitem>
 527                                     <para>Specifies the delay before a link is disabled after a link down
 528                                     status has been detected. This value is rounded down to a multiple of
 529                                     MIIMonitorSec. The default value is 0.</para>
 530                                   </listitem>
 531                                 </varlistentry>
 532
 533                         </variablelist>
 534         </refsect1>
 535
 536         <refsect1>
 537                 <title>Example</title>
 538                 <example>
 539                         <title>/etc/systemd/network/bridge.netdev</title>
 540
 541                         <programlisting>[NetDev]
 542 Name=bridge0
 543 Kind=bridge</programlisting>
 544                 </example>
 545
 546                 <example>
 547                         <title>/etc/systemd/network/vlan1.netdev</title>
 548
 549                         <programlisting>[Match]
 550 Virtualization=no
 551
 552 [NetDev]
 553 Name=vlan1
 554 Kind=vlan
 555
 556 [VLAN]
 557 Id=1</programlisting>
 558                 </example>
 559                 <example>
 560                         <title>/etc/systemd/network/ipip.netdev</title>
 561                         <programlisting>[NetDev]
 562 Name=ipip-tun
 563 Kind=ipip
 564 MTUBytes=1480
 565
 566 [Tunnel]
 567 Local=192.168.223.238
 568 Remote=192.169.224.239
 569 TTL=64</programlisting>
 570                 </example>
 571                 <example>
 572                   <title>/etc/systemd/network/tap.netdev</title>
 573                   <programlisting>[NetDev]
 574 Name=tap-test
 575 Kind=tap
 576
 577 [Tap]
 578 MultiQueue=true
 579 PacketInfo=true</programlisting> </example>
 580
 581                 <example>
 582                         <title>/etc/systemd/network/sit.netdev</title>
 583                         <programlisting>[NetDev]
 584 Name=sit-tun
 585 Kind=sit
 586 MTUBytes=1480
 587
 588 [Tunnel]
 589 Local=10.65.223.238
 590 Remote=10.65.223.239</programlisting>
 591                 </example>
 592
 593                 <example>
 594                         <title>/etc/systemd/network/gre.netdev</title>
 595                         <programlisting>[NetDev]
 596 Name=gre-tun
 597 Kind=gre
 598 MTUBytes=1480
 599
 600 [Tunnel]
 601 Local=10.65.223.238
 602 Remote=10.65.223.239</programlisting>
 603                 </example>
 604
 605                 <example>
 606                         <title>/etc/systemd/network/vti.netdev</title>
 607
 608                         <programlisting>[NetDev]
 609 Name=vti-tun
 610 Kind=vti
 611 MTUBytes=1480
 612
 613 [Tunnel]
 614 Local=10.65.223.238
 615 Remote=10.65.223.239</programlisting>
 616                 </example>
 617
 618                 <example>
 619                         <title>/etc/systemd/network/veth.netdev</title>
 620                         <programlisting>[NetDev]
 621 Name=veth-test
 622 Kind=veth
 623
 624 [Peer]
 625 Name=veth-peer</programlisting>
 626                 </example>
 627
 628                 <example>
 629                         <title>/etc/systemd/network/dummy.netdev</title>
 630                         <programlisting>[NetDev]
 631 Name=dummy-test
 632 Kind=dummy
 633 MACAddress=12:34:56:78:9a:bc</programlisting>
 634                 </example>
 635
 636         </refsect1>
 637         <refsect1>
 638                 <title>See Also</title>
 639                 <para>
 640                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 641                         <citerefentry><refentrytitle>systemd-networkd</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 642                         <citerefentry><refentrytitle>systemd.link</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 643                         <citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum></citerefentry>
 644                 </para>
 645         </refsect1>
 646
 647 </refentry>