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>gretap</literal>, <literal>sit</literal>,
 170                                                 <literal>vti</literal>, <literal>veth</literal>,
 171                                                 <literal>tun</literal>, <literal>tap</literal> and
 172                                                 <literal>dummy</literal>
 173                                                 are supported. This option is compulsory.</para>
 174                                         </listitem>
 175                                 </varlistentry>
 176                                 <varlistentry>
 177                                         <term><varname>MTUBytes=</varname></term>
 178                                         <listitem>
 179                                                 <para>The maximum transmission unit in bytes to
 180                                                 set for the device. The usual suffixes K, M, G,
 181                                                 are supported and are understood to the base of
 182                                                 1024. This key is not currently suported for
 183                                                 <literal>tun</literal> or <literal>tap</literal> devices.
 184                                                 </para>
 185                                         </listitem>
 186                                 </varlistentry>
 187                                 <varlistentry>
 188                                         <term><varname>MACAddress=</varname></term>
 189                                         <listitem>
 190                                                 <para>The MAC address to use for the device.
 191                                                 If none is given, one is generated based on
 192                                                 the interface name and the
 193                                                 <citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
 194                                                 This key is not currently suported for <literal>tun</literal> or <literal>tap</literal> devices.
 195                                                 </para>
 196                                         </listitem>
 197                                 </varlistentry>
 198                         </variablelist>
 199         </refsect1>
 200
 201         <refsect1>
 202                 <title>[VLAN] Section Options</title>
 203
 204                         <para>The <literal>[VLAN]</literal> section only applies for netdevs of kind <literal>vlan</literal>,
 205                         and accepts the following key:</para>
 206
 207                         <variablelist class='network-directives'>
 208                                 <varlistentry>
 209                                         <term><varname>Id=</varname></term>
 210                                         <listitem>
 211                                                 <para>The VLAN ID to use. An integer in the range 0–4094.
 212                                                 This option is compulsory.</para>
 213                                         </listitem>
 214                                 </varlistentry>
 215                         </variablelist>
 216
 217         </refsect1>
 218
 219         <refsect1>
 220                 <title>[MACVLAN] Section Options</title>
 221
 222                         <para>The <literal>[MACVLAN]</literal> section only applies for netdevs of kind
 223                         <literal>macvlan</literal>, and accepts the following key:</para>
 224
 225                         <variablelist class='network-directives'>
 226                                 <varlistentry>
 227                                         <term><varname>Mode=</varname></term>
 228                                         <listitem>
 229                                                 <para>The MACVLAN mode to use. The supported options are
 230                                                 <literal>private</literal>, <literal>vepa</literal>,
 231                                                 <literal>bridge</literal> and <literal>passthru</literal>.
 232                                                 </para>
 233                                         </listitem>
 234                                 </varlistentry>
 235                         </variablelist>
 236
 237         </refsect1>
 238
 239         <refsect1>
 240                 <title>[IPVLAN] Section Options</title>
 241
 242                         <para>The <literal>[IPVLAN]</literal> section only applies for netdevs of kind
 243                         <literal>ipvlan</literal>, and accepts the following key:</para>
 244
 245                         <variablelist class='network-directives'>
 246                                 <varlistentry>
 247                                         <term><varname>Mode=</varname></term>
 248                                         <listitem>
 249                                                 <para>The IPVLAN mode to use. The supported options are
 250                                                 <literal>L2</literal> and <literal>L3</literal>.
 251                                                 </para>
 252                                         </listitem>
 253                                 </varlistentry>
 254                         </variablelist>
 255
 256         </refsect1>
 257
 258         <refsect1>
 259                 <title>[VXLAN] Section Options</title>
 260                         <para>The <literal>[VXLAN]</literal> section only applies for netdevs of kind
 261                         <literal>vxlan</literal>, and accepts the following key:</para>
 262
 263                         <variablelist class='network-directives'>
 264                                 <varlistentry>
 265                                         <term><varname>Id=</varname></term>
 266                                         <listitem>
 267                                                 <para>The VXLAN ID to use.</para>
 268                                         </listitem>
 269                                 </varlistentry>
 270                                 <varlistentry>
 271                                         <term><varname>Group=</varname></term>
 272                                         <listitem>
 273                                                 <para>An assigned multicast group IP address.</para>
 274                                         </listitem>
 275                                 </varlistentry>
 276                                 <varlistentry>
 277                                         <term><varname>TOS=</varname></term>
 278                                         <listitem>
 279                                                 <para>The Type Of Service byte value for a vxlan interface.</para>
 280                                         </listitem>
 281                                 </varlistentry>
 282                                 <varlistentry>
 283                                         <term><varname>TTL=</varname></term>
 284                                         <listitem>
 285                                                 <para>A fixed Time To Live N on Virtual eXtensible Local Area Network packets.
 286                                                 N is a number in the range 1-255. 0 is a special value meaning that packets
 287                                                 inherit the TTL value.</para>
 288                                         </listitem>
 289                                 </varlistentry>
 290                                 <varlistentry>
 291                                         <term><varname>MacLearning=</varname></term>
 292                                         <listitem>
 293                                                 <para>A boolean. When true, enables dynamic MAC learning
 294                                                 to discover remote MAC addresses.</para>
 295                                         </listitem>
 296                                 </varlistentry>
 297                                 <varlistentry>
 298                                         <term><varname>FDBAgeingSec=</varname></term>
 299                                         <listitem>
 300                                                 <para>The lifetime of Forwarding Database entry learnt by the kernel in seconds.</para>
 301                                         </listitem>
 302                                 </varlistentry>
 303                                 <varlistentry>
 304                                         <term><varname>ARPProxy=</varname></term>
 305                                         <listitem>
 306                                                 <para>A boolean. When true, enables ARP proxy.</para>
 307                                         </listitem>
 308                                 </varlistentry>
 309                                 <varlistentry>
 310                                         <term><varname>L2MissNotification=</varname></term>
 311                                         <listitem>
 312                                                 <para>A boolean. When true, enables netlink LLADDR miss notifications.</para>
 313                                         </listitem>
 314                                 </varlistentry>
 315                                 <varlistentry>
 316                                         <term><varname>L3MissNotification=</varname></term>
 317                                         <listitem>
 318                                                 <para>A boolean. When true, enables netlink IP ADDR miss notifications.</para>
 319                                         </listitem>
 320                                 </varlistentry>
 321                                 <varlistentry>
 322                                         <term><varname>RouteShortCircuit=</varname></term>
 323                                         <listitem>
 324                                                 <para>A boolean. When true route short circuit is turned on.</para>
 325                                         </listitem>
 326                                 </varlistentry>
 327                         </variablelist>
 328         </refsect1>
 329         <refsect1>
 330                 <title>[Tunnel] Section Options</title>
 331
 332                         <para>The <literal>[Tunnel]</literal> section only applies for netdevs of kind
 333                         <literal>ipip</literal>, <literal>sit</literal>, <literal>gre</literal>, <literal>gretap</literal>,
 334                         and <literal>vti</literal> and accepts the following keys:</para>
 335
 336                         <variablelist class='network-directives'>
 337                                 <varlistentry>
 338                                         <term><varname>Local=</varname></term>
 339                                         <listitem>
 340                                                 <para>A static local address for tunneled packets.
 341                                                 It must be an address on another interface of this host.</para>
 342                                         </listitem>
 343                                 </varlistentry>
 344                                 <varlistentry>
 345                                         <term><varname>Remote=</varname></term>
 346                                         <listitem>
 347                                                 <para>The remote endpoint of the tunnel.</para>
 348                                         </listitem>
 349                                 </varlistentry>
 350                                 <varlistentry>
 351                                         <term><varname>TOS=</varname></term>
 352                                         <listitem>
 353                                                 <para>The Type Of Service byte value for a tunnel interface.
 354                                                 For details about the TOS see the
 355                                                 <ulink url="http://tools.ietf.org/html/rfc1349">
 356                                                 Type of Service in the Internet Protocol Suite
 357                                                 </ulink> document.
 358                                                 </para>
 359                                         </listitem>
 360                                 </varlistentry>
 361                                 <varlistentry>
 362                                         <term><varname>TTL=</varname></term>
 363                                         <listitem>
 364                                                 <para>A fixed Time To Live N on tunneled packets.
 365                                                 N is a number in the range 1-255. 0 is a special value meaning that packets
 366                                                 inherit the TTL value. The default value for IPv4 tunnels is: inherit.
 367                                                 The default value for IPv6 tunnels is: 64.</para>
 368                                         </listitem>
 369                                 </varlistentry>
 370                                 <varlistentry>
 371                                         <term><varname>DiscoverPathMTU=</varname></term>
 372                                         <listitem>
 373                                                 <para>A boolean. When true, enables Path MTU Discovery on the tunnel.</para>
 374                                         </listitem>
 375                                 </varlistentry>
 376                         </variablelist>
 377         </refsect1>
 378         <refsect1>
 379                 <title>[Peer] Section Options</title>
 380
 381                         <para>The <literal>[Peer]</literal> section only applies for netdevs of kind <literal>veth</literal>
 382                         and accepts the following key:</para>
 383
 384                         <variablelist class='network-directives'>
 385                                 <varlistentry>
 386                                         <term><varname>Name=</varname></term>
 387                                         <listitem>
 388                                                 <para>The interface name used when creating the netdev.
 389                                                 This option is compulsory.</para>
 390                                         </listitem>
 391                                 </varlistentry>
 392                                 <varlistentry>
 393                                         <term><varname>MACAddress=</varname></term>
 394                                         <listitem>
 395                                                 <para>The peer MACAddress, if not set it is generated in the same
 396                                                 way as the MAC address of the main interface.</para>
 397                                         </listitem>
 398                                 </varlistentry>
 399                         </variablelist>
 400         </refsect1>
 401         <refsect1>
 402                 <title>[Tun] Section Options</title>
 403
 404                         <para>The <literal>[Tun]</literal> section only applies for netdevs of kind
 405                         <literal>tun</literal>, and accepts the following keys:</para>
 406
 407                         <variablelist class='network-directives'>
 408                                 <varlistentry>
 409                                         <term><varname>OneQueue=</varname></term>
 410                                         <listitem><para>Takes a boolean argument. Configures whether
 411                                         all packets are queued at the device (enabled), or a fixed number
 412                                         of packets are queued at the device and the rest at the
 413                                         <literal>qdisc</literal>. Defaults to <literal>no</literal>.</para>
 414                                         </listitem>
 415                                 </varlistentry>
 416                                 <varlistentry>
 417                                         <term><varname>MultiQueue=</varname></term>
 418                                         <listitem><para>Takes a boolean argument. Configures whether to
 419                                         use multiple file descriptors (queues) to parallelize packets
 420                                         sending and receiving. Defaults to <literal>no</literal>.</para>
 421                                         </listitem>
 422                                 </varlistentry>
 423                                 <varlistentry>
 424                                         <term><varname>PacketInfo=</varname></term>
 425                                         <listitem><para>Takes a boolean argument. Configures whether packets
 426                                         should be prepened with four extra bytes (two flag bytes and two
 427                                         protocol bytes). If disabled it indicates that the packets will be
 428                                         pure IP packets. Defaults to <literal>no</literal>.</para>
 429                                         </listitem>
 430                                 </varlistentry>
 431                                 <varlistentry>
 432                                         <term><varname>User=</varname></term>
 433                                         <listitem><para>User to grant access to the <filename>/dev/net/tun</filename>
 434                                         device.</para>
 435                                         </listitem>
 436                                 </varlistentry>
 437                                 <varlistentry>
 438                                         <term><varname>Group=</varname></term>
 439                                         <listitem><para>Group to grant access to the <filename>/dev/net/tun</filename>
 440                                         device.</para>
 441                                         </listitem>
 442                                 </varlistentry>
 443
 444                         </variablelist>
 445
 446         </refsect1>
 447
 448         <refsect1>
 449                 <title>[Tap] Section Options</title>
 450
 451                         <para>The <literal>[Tap]</literal> section only applies for netdevs of kind
 452                         <literal>tap</literal>, and accepts the same keys as the
 453                         <literal>[Tun]</literal> section.</para>
 454         </refsect1>
 455
 456         <refsect1>
 457                 <title>[Bond] Section Options</title>
 458
 459                         <para>The <literal>[Bond]</literal> section accepts the following
 460                         key:</para>
 461
 462                         <variablelist class='network-directives'>
 463                                 <varlistentry>
 464                                         <term><varname>Mode=</varname></term>
 465                                         <listitem>
 466                                           <para>Specifies one of the bonding policies. The default is
 467                                           <literal>balance-rr</literal> (round robin). Possible values are
 468                                                 <literal>balance-rr</literal>,
 469                                                 <literal>active-backup</literal>,
 470                                                 <literal>balance-xor</literal>,
 471                                                 <literal>broadcast</literal>,
 472                                                 <literal>802.3ad</literal>,
 473                                                 <literal>balance-tlb</literal>, and
 474                                                 <literal>balance-alb</literal>.
 475                                           </para>
 476                                         </listitem>
 477                                 </varlistentry>
 478
 479                                 <varlistentry>
 480                                   <term><varname>TransmitHashPolicy=</varname></term>
 481                                   <listitem>
 482                                     <para>Selects the transmit hash policy to use for slave selection in
 483                                     balance-xor, 802.3ad, and tlb modes. Possible values are
 484                                     <literal>layer2</literal>,
 485                                     <literal>layer3+4</literal>,
 486                                     <literal>layer2+3</literal>,
 487                                     <literal>encap2+3</literal>,
 488                                     <literal>802.3ad</literal>, and
 489                                     <literal>encap3+4</literal>.
 490                                     </para>
 491                                   </listitem>
 492                                 </varlistentry>
 493
 494                                 <varlistentry>
 495                                   <term><varname>LACPTransmitRate=</varname></term>
 496                                   <listitem>
 497                                     <para>Specifies the rate with which link partner
 498                                     transmits Link Aggregation Control Protocol Data Unit packets
 499                                     in 802.3ad mode. Possible values are
 500                                     <literal>slow</literal>, which requests partner to transmit LACPDUs every 30 seconds, and
 501                                     <literal>fast</literal>, which requests partner to transmit LACPDUs every second.
 502                                     The default value is <literal>slow</literal>.</para>
 503                                   </listitem>
 504                                 </varlistentry>
 505
 506                                 <varlistentry>
 507                                   <term><varname>MIIMonitorSec=</varname></term>
 508                                   <listitem>
 509                                     <para>Specifies the frequency that Media Independent Interface link
 510                                     monitoring will occur. A value of zero disables MII link monitoring.
 511                                     This values is rounded down to the nearest millisecond. The default
 512                                     value is 0.</para>
 513                                   </listitem>
 514                                 </varlistentry>
 515
 516                                 <varlistentry>
 517                                   <term><varname>UpDelaySec=</varname></term>
 518                                   <listitem>
 519                                     <para>Specifies the delay before a link is enabled after a link up
 520                                     status has been detected. This value is rounded down to a multiple of
 521                                     MIIMonitorSec. The default value is 0.</para>
 522                                   </listitem>
 523                                 </varlistentry>
 524
 525                                 <varlistentry>
 526                                   <term><varname>DownDelaySec=</varname></term>
 527                                   <listitem>
 528                                     <para>Specifies the delay before a link is disabled after a link down
 529                                     status has been detected. This value is rounded down to a multiple of
 530                                     MIIMonitorSec. The default value is 0.</para>
 531                                   </listitem>
 532                                 </varlistentry>
 533
 534                         </variablelist>
 535         </refsect1>
 536
 537         <refsect1>
 538                 <title>Example</title>
 539                 <example>
 540                         <title>/etc/systemd/network/bridge.netdev</title>
 541
 542                         <programlisting>[NetDev]
 543 Name=bridge0
 544 Kind=bridge</programlisting>
 545                 </example>
 546
 547                 <example>
 548                         <title>/etc/systemd/network/vlan1.netdev</title>
 549
 550                         <programlisting>[Match]
 551 Virtualization=no
 552
 553 [NetDev]
 554 Name=vlan1
 555 Kind=vlan
 556
 557 [VLAN]
 558 Id=1</programlisting>
 559                 </example>
 560                 <example>
 561                         <title>/etc/systemd/network/ipip.netdev</title>
 562                         <programlisting>[NetDev]
 563 Name=ipip-tun
 564 Kind=ipip
 565 MTUBytes=1480
 566
 567 [Tunnel]
 568 Local=192.168.223.238
 569 Remote=192.169.224.239
 570 TTL=64</programlisting>
 571                 </example>
 572                 <example>
 573                   <title>/etc/systemd/network/tap.netdev</title>
 574                   <programlisting>[NetDev]
 575 Name=tap-test
 576 Kind=tap
 577
 578 [Tap]
 579 MultiQueue=true
 580 PacketInfo=true</programlisting> </example>
 581
 582                 <example>
 583                         <title>/etc/systemd/network/sit.netdev</title>
 584                         <programlisting>[NetDev]
 585 Name=sit-tun
 586 Kind=sit
 587 MTUBytes=1480
 588
 589 [Tunnel]
 590 Local=10.65.223.238
 591 Remote=10.65.223.239</programlisting>
 592                 </example>
 593
 594                 <example>
 595                         <title>/etc/systemd/network/gre.netdev</title>
 596                         <programlisting>[NetDev]
 597 Name=gre-tun
 598 Kind=gre
 599 MTUBytes=1480
 600
 601 [Tunnel]
 602 Local=10.65.223.238
 603 Remote=10.65.223.239</programlisting>
 604                 </example>
 605
 606                 <example>
 607                         <title>/etc/systemd/network/vti.netdev</title>
 608
 609                         <programlisting>[NetDev]
 610 Name=vti-tun
 611 Kind=vti
 612 MTUBytes=1480
 613
 614 [Tunnel]
 615 Local=10.65.223.238
 616 Remote=10.65.223.239</programlisting>
 617                 </example>
 618
 619                 <example>
 620                         <title>/etc/systemd/network/veth.netdev</title>
 621                         <programlisting>[NetDev]
 622 Name=veth-test
 623 Kind=veth
 624
 625 [Peer]
 626 Name=veth-peer</programlisting>
 627                 </example>
 628
 629                 <example>
 630                         <title>/etc/systemd/network/dummy.netdev</title>
 631                         <programlisting>[NetDev]
 632 Name=dummy-test
 633 Kind=dummy
 634 MACAddress=12:34:56:78:9a:bc</programlisting>
 635                 </example>
 636
 637         </refsect1>
 638         <refsect1>
 639                 <title>See Also</title>
 640                 <para>
 641                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 642                         <citerefentry><refentrytitle>systemd-networkd</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 643                         <citerefentry><refentrytitle>systemd.link</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 644                         <citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum></citerefentry>
 645                 </para>
 646         </refsect1>
 647
 648 </refentry>