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b97e7fab | 1 | <?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*--> |
1ff28eae | 2 | <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" |
12b42c76 | 3 | "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> |
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4 | |
5 | <!-- | |
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6 | SPDX-License-Identifier: LGPL-2.1+ |
7 | ||
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8 | This file is part of systemd. |
9 | ||
10 | Copyright 2014 Tom Gundersen | |
1ff28eae TG |
11 | --> |
12 | ||
13 | <refentry id="systemd.link"> | |
798d3a52 ZJS |
14 | <refentryinfo> |
15 | <title>systemd.link</title> | |
16 | <productname>systemd</productname> | |
1ff28eae | 17 | |
798d3a52 ZJS |
18 | <authorgroup> |
19 | <author> | |
20 | <contrib>Developer</contrib> | |
21 | <firstname>Tom</firstname> | |
22 | <surname>Gundersen</surname> | |
23 | </author> | |
24 | </authorgroup> | |
25 | </refentryinfo> | |
1ff28eae | 26 | |
798d3a52 ZJS |
27 | <refmeta> |
28 | <refentrytitle>systemd.link</refentrytitle> | |
29 | <manvolnum>5</manvolnum> | |
30 | </refmeta> | |
1ff28eae | 31 | |
798d3a52 ZJS |
32 | <refnamediv> |
33 | <refname>systemd.link</refname> | |
34 | <refpurpose>Network device configuration</refpurpose> | |
35 | </refnamediv> | |
1ff28eae | 36 | |
798d3a52 ZJS |
37 | <refsynopsisdiv> |
38 | <para><filename><replaceable>link</replaceable>.link</filename></para> | |
39 | </refsynopsisdiv> | |
1ff28eae | 40 | |
798d3a52 ZJS |
41 | <refsect1> |
42 | <title>Description</title> | |
1ff28eae | 43 | |
798d3a52 ZJS |
44 | <para>Network link configuration is performed by the |
45 | <command>net_setup_link</command> udev builtin.</para> | |
1ff28eae | 46 | |
798d3a52 | 47 | <para>The link files are read from the files located in the system |
12b42c76 | 48 | network directory <filename>/usr/lib/systemd/network</filename>, |
798d3a52 ZJS |
49 | the volatile runtime network directory |
50 | <filename>/run/systemd/network</filename>, and the local | |
51 | administration network directory | |
12b42c76 | 52 | <filename>/etc/systemd/network</filename>. Link files must have |
798d3a52 ZJS |
53 | the extension <filename>.link</filename>; other extensions are |
54 | ignored. All link files are collectively sorted and processed in | |
55 | lexical order, regardless of the directories in which they live. | |
56 | However, files with identical filenames replace each other. Files | |
57 | in <filename>/etc</filename> have the highest priority, files in | |
58 | <filename>/run</filename> take precedence over files with the same | |
12b42c76 | 59 | name in <filename>/usr/lib</filename>. This can be used to |
57e27ec0 ZJS |
60 | override a system-supplied link file with a local file if needed. |
61 | As a special case, an empty file (file size 0) or symlink with the | |
a8eaaee7 | 62 | same name pointing to <filename>/dev/null</filename> disables the |
57e27ec0 | 63 | configuration file entirely (it is "masked").</para> |
1ff28eae | 64 | |
798d3a52 ZJS |
65 | <para>The link file contains a <literal>[Match]</literal> section, |
66 | which determines if a given link file may be applied to a given | |
67 | device, as well as a <literal>[Link]</literal> section specifying | |
68 | how the device should be configured. The first (in lexical order) | |
69 | of the link files that matches a given device is applied. Note | |
70 | that a default file <filename>99-default.link</filename> is | |
1b934761 | 71 | shipped by the system. Any user-supplied |
798d3a52 ZJS |
72 | <filename>.link</filename> should hence have a lexically earlier |
73 | name to be considered at all.</para> | |
788f37c7 TG |
74 | |
75 | <para>See | |
76 | <citerefentry><refentrytitle>udevadm</refentrytitle><manvolnum>8</manvolnum></citerefentry> | |
77 | for diagnosing problems with <filename>.link</filename> files.</para> | |
798d3a52 | 78 | </refsect1> |
102bd40e | 79 | |
798d3a52 ZJS |
80 | <refsect1> |
81 | <title>[Match] Section Options</title> | |
1ff28eae | 82 | |
798d3a52 ZJS |
83 | <para>A link file is said to match a device if each of the entries |
84 | in the <literal>[Match]</literal> section matches, or if the | |
85 | section is empty. The following keys are accepted:</para> | |
1ff28eae | 86 | |
798d3a52 ZJS |
87 | <variablelist class='network-directives'> |
88 | <varlistentry> | |
89 | <term><varname>MACAddress=</varname></term> | |
90 | <listitem> | |
91 | <para>The hardware address.</para> | |
92 | </listitem> | |
93 | </varlistentry> | |
94 | <varlistentry> | |
95 | <term><varname>OriginalName=</varname></term> | |
96 | <listitem> | |
5256e00e TG |
97 | <para>A whitespace-separated list of shell-style globs matching |
98 | the device name, as exposed by the udev property | |
2dd67817 | 99 | "INTERFACE". This cannot be used to match on names that have |
5256e00e | 100 | already been changed from userspace. Caution is advised when matching on |
798d3a52 ZJS |
101 | kernel-assigned names, as they are known to be unstable |
102 | between reboots.</para> | |
103 | </listitem> | |
104 | </varlistentry> | |
105 | <varlistentry> | |
106 | <term><varname>Path=</varname></term> | |
107 | <listitem> | |
5256e00e TG |
108 | <para>A whitespace-separated list of shell-style globs matching |
109 | the persistent path, as exposed by the udev property | |
110 | <literal>ID_PATH</literal>.</para> | |
798d3a52 ZJS |
111 | </listitem> |
112 | </varlistentry> | |
113 | <varlistentry> | |
114 | <term><varname>Driver=</varname></term> | |
115 | <listitem> | |
5256e00e TG |
116 | <para>A whitespace-separated list of shell-style globs matching |
117 | the driver currently bound to the device, | |
798d3a52 ZJS |
118 | as exposed by the udev property <literal>DRIVER</literal> |
119 | of its parent device, or if that is not set, the | |
120 | driver as exposed by <literal>ethtool -i</literal> | |
121 | of the device itself.</para> | |
122 | </listitem> | |
123 | </varlistentry> | |
124 | <varlistentry> | |
125 | <term><varname>Type=</varname></term> | |
126 | <listitem> | |
5256e00e TG |
127 | <para>A whitespace-separated list of shell-style globs matching |
128 | the device type, as exposed by the udev | |
798d3a52 ZJS |
129 | property <literal>DEVTYPE</literal>.</para> |
130 | </listitem> | |
131 | </varlistentry> | |
132 | <varlistentry> | |
133 | <term><varname>Host=</varname></term> | |
134 | <listitem> | |
135 | <para>Matches against the hostname or machine | |
136 | ID of the host. See <literal>ConditionHost=</literal> in | |
137 | <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry> | |
138 | for details.</para> | |
139 | </listitem> | |
140 | </varlistentry> | |
141 | <varlistentry> | |
142 | <term><varname>Virtualization=</varname></term> | |
143 | <listitem> | |
144 | <para>Checks whether the system is executed in | |
145 | a virtualized environment and optionally test | |
146 | whether it is a specific implementation. See | |
147 | <literal>ConditionVirtualization=</literal> in | |
148 | <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry> | |
149 | for details.</para> | |
150 | </listitem> | |
151 | </varlistentry> | |
152 | <varlistentry> | |
153 | <term><varname>KernelCommandLine=</varname></term> | |
154 | <listitem> | |
155 | <para>Checks whether a specific kernel command line option | |
156 | is set (or if prefixed with the exclamation mark unset). See | |
157 | <literal>ConditionKernelCommandLine=</literal> in | |
158 | <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry> | |
159 | for details.</para> | |
160 | </listitem> | |
161 | </varlistentry> | |
5022f08a LP |
162 | <varlistentry> |
163 | <term><varname>KernelVersion=</varname></term> | |
164 | <listitem> | |
165 | <para>Checks whether the kernel version (as reported by <command>uname -r</command>) matches a certain | |
166 | expression (or if prefixed with the exclamation mark does not match it). See | |
167 | <literal>ConditionKernelVersion=</literal> in | |
168 | <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry> for | |
169 | details. | |
170 | </para> | |
171 | </listitem> | |
172 | </varlistentry> | |
798d3a52 ZJS |
173 | <varlistentry> |
174 | <term><varname>Architecture=</varname></term> | |
175 | <listitem> | |
176 | <para>Checks whether the system is running on a specific | |
177 | architecture. See <literal>ConditionArchitecture=</literal> | |
178 | in | |
179 | <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry> | |
180 | for details.</para> | |
181 | </listitem> | |
182 | </varlistentry> | |
183 | </variablelist> | |
1ff28eae | 184 | |
798d3a52 | 185 | </refsect1> |
102bd40e | 186 | |
798d3a52 ZJS |
187 | <refsect1> |
188 | <title>[Link] Section Options</title> | |
102bd40e | 189 | |
798d3a52 ZJS |
190 | <para>The <literal>[Link]</literal> section accepts the following |
191 | keys:</para> | |
1ff28eae | 192 | |
798d3a52 ZJS |
193 | <variablelist class='network-directives'> |
194 | <varlistentry> | |
195 | <term><varname>Description=</varname></term> | |
196 | <listitem> | |
197 | <para>A description of the device.</para> | |
198 | </listitem> | |
199 | </varlistentry> | |
200 | <varlistentry> | |
201 | <term><varname>Alias=</varname></term> | |
202 | <listitem> | |
203 | <para>The <literal>ifalias</literal> is set to this | |
204 | value.</para> | |
205 | </listitem> | |
206 | </varlistentry> | |
207 | <varlistentry> | |
208 | <term><varname>MACAddressPolicy=</varname></term> | |
209 | <listitem> | |
210 | <para>The policy by which the MAC address should be set. The | |
211 | available policies are: | |
212 | </para> | |
1ff28eae | 213 | |
798d3a52 ZJS |
214 | <variablelist> |
215 | <varlistentry> | |
216 | <term><literal>persistent</literal></term> | |
217 | <listitem> | |
218 | <para>If the hardware has a persistent MAC address, as | |
219 | most hardware should, and if it is used by the kernel, | |
220 | nothing is done. Otherwise, a new MAC address is | |
221 | generated which is guaranteed to be the same on every | |
222 | boot for the given machine and the given device, but | |
1c25683e | 223 | which is otherwise random. This feature depends on ID_NET_NAME_* |
a8eaaee7 | 224 | properties to exist for the link. On hardware where these |
b938cb90 | 225 | properties are not set, the generation of a persistent MAC address |
1c25683e | 226 | will fail.</para> |
798d3a52 ZJS |
227 | </listitem> |
228 | </varlistentry> | |
229 | <varlistentry> | |
230 | <term><literal>random</literal></term> | |
231 | <listitem> | |
232 | <para>If the kernel is using a random MAC address, | |
233 | nothing is done. Otherwise, a new address is randomly | |
234 | generated each time the device appears, typically at | |
b938cb90 | 235 | boot. Either way, the random address will have the |
2e229e0c TG |
236 | <literal>unicast</literal> and |
237 | <literal>locally administered</literal> bits set.</para> | |
798d3a52 ZJS |
238 | </listitem> |
239 | </varlistentry> | |
66d3752e JK |
240 | <varlistentry> |
241 | <term><literal>none</literal></term> | |
242 | <listitem> | |
243 | <para>Keeps the MAC address assigned by the kernel.</para> | |
244 | </listitem> | |
245 | </varlistentry> | |
798d3a52 ZJS |
246 | </variablelist> |
247 | </listitem> | |
248 | </varlistentry> | |
249 | <varlistentry> | |
250 | <term><varname>MACAddress=</varname></term> | |
251 | <listitem> | |
252 | <para>The MAC address to use, if no | |
253 | <literal>MACAddressPolicy=</literal> | |
254 | is specified.</para> | |
255 | </listitem> | |
256 | </varlistentry> | |
257 | <varlistentry> | |
258 | <term><varname>NamePolicy=</varname></term> | |
259 | <listitem> | |
260 | <para>An ordered, space-separated list of policies by which | |
261 | the interface name should be set. | |
262 | <literal>NamePolicy</literal> may be disabled by specifying | |
263 | <literal>net.ifnames=0</literal> on the kernel command line. | |
264 | Each of the policies may fail, and the first successful one | |
265 | is used. The name is not set directly, but is exported to | |
266 | udev as the property <literal>ID_NET_NAME</literal>, which | |
267 | is, by default, used by a udev rule to set | |
268 | <literal>NAME</literal>. If the name has already been set by | |
269 | userspace, no renaming is performed. The available policies | |
270 | are:</para> | |
1ff28eae | 271 | |
798d3a52 ZJS |
272 | <variablelist> |
273 | <varlistentry> | |
274 | <term><literal>kernel</literal></term> | |
275 | <listitem> | |
276 | <para>If the kernel claims that the name it has set | |
277 | for a device is predictable, then no renaming is | |
278 | performed.</para> | |
279 | </listitem> | |
280 | </varlistentry> | |
281 | <varlistentry> | |
282 | <term><literal>database</literal></term> | |
283 | <listitem> | |
284 | <para>The name is set based on entries in the udev's | |
285 | Hardware Database with the key | |
286 | <literal>ID_NET_NAME_FROM_DATABASE</literal>. | |
287 | </para> | |
288 | </listitem> | |
289 | </varlistentry> | |
290 | <varlistentry> | |
291 | <term><literal>onboard</literal></term> | |
292 | <listitem> | |
293 | <para>The name is set based on information given by | |
294 | the firmware for on-board devices, as exported by the | |
295 | udev property <literal>ID_NET_NAME_ONBOARD</literal>. | |
296 | </para> | |
297 | </listitem> | |
298 | </varlistentry> | |
299 | <varlistentry> | |
300 | <term><literal>slot</literal></term> | |
301 | <listitem> | |
302 | <para>The name is set based on information given by | |
303 | the firmware for hot-plug devices, as exported by the | |
304 | udev property <literal>ID_NET_NAME_SLOT</literal>. | |
305 | </para> | |
306 | </listitem> | |
307 | </varlistentry> | |
308 | <varlistentry> | |
309 | <term><literal>path</literal></term> | |
310 | <listitem> | |
311 | <para>The name is set based on the device's physical | |
312 | location, as exported by the udev property | |
313 | <literal>ID_NET_NAME_PATH</literal>.</para> | |
314 | </listitem> | |
315 | </varlistentry> | |
316 | <varlistentry> | |
317 | <term><literal>mac</literal></term> | |
318 | <listitem> | |
319 | <para>The name is set based on the device's persistent | |
320 | MAC address, as exported by the udev property | |
321 | <literal>ID_NET_NAME_MAC</literal>.</para> | |
322 | </listitem> | |
323 | </varlistentry> | |
324 | </variablelist> | |
325 | </listitem> | |
326 | </varlistentry> | |
327 | <varlistentry> | |
328 | <term><varname>Name=</varname></term> | |
329 | <listitem> | |
330 | <para>The interface name to use in case all the | |
331 | policies specified in | |
332 | <varname>NamePolicy=</varname> fail, or in case | |
333 | <varname>NamePolicy=</varname> is missing or | |
334 | disabled.</para> | |
1b934761 ZJS |
335 | |
336 | <para>Note that specifying a name that the kernel might use for another | |
337 | interface (for example <literal>eth0</literal>) is dangerous because the | |
338 | name assignment done by udev will race with the assignment done by the | |
339 | kernel, and only one interface may use the name. Depending on the order of | |
340 | operations, either udev or the kernel will win, making the naming | |
341 | unpredictable. It is best to use some different prefix, for example | |
342 | <literal>internal0</literal>/<literal>external0</literal> or | |
343 | <literal>lan0</literal>/<literal>lan1</literal>/<literal>lan3</literal>. | |
344 | </para> | |
798d3a52 ZJS |
345 | </listitem> |
346 | </varlistentry> | |
347 | <varlistentry> | |
348 | <term><varname>MTUBytes=</varname></term> | |
349 | <listitem> | |
350 | <para>The maximum transmission unit in bytes to set for the | |
351 | device. The usual suffixes K, M, G, are supported and are | |
352 | understood to the base of 1024.</para> | |
353 | </listitem> | |
354 | </varlistentry> | |
355 | <varlistentry> | |
356 | <term><varname>BitsPerSecond=</varname></term> | |
357 | <listitem> | |
358 | <para>The speed to set for the device, the value is rounded | |
359 | down to the nearest Mbps. The usual suffixes K, M, G, are | |
360 | supported and are understood to the base of 1000.</para> | |
361 | </listitem> | |
362 | </varlistentry> | |
363 | <varlistentry> | |
364 | <term><varname>Duplex=</varname></term> | |
365 | <listitem> | |
366 | <para>The duplex mode to set for the device. The accepted | |
367 | values are <literal>half</literal> and | |
368 | <literal>full</literal>.</para> | |
369 | </listitem> | |
370 | </varlistentry> | |
a39f92d3 SS |
371 | <varlistentry> |
372 | <term><varname>AutoNegotiation=</varname></term> | |
373 | <listitem> | |
374 | <para>Enables or disables automatic negotiation of transmission parameters. | |
375 | Autonegotiation is a procedure by which two connected ethernet devices choose | |
376 | common transmission parameters, such as speed, duplex mode, and flow control. | |
377 | Takes a boolean value. Unset by default, which means that the kernel default | |
378 | will be used.</para> | |
379 | ||
380 | <para>Note that if autonegotiation is enabled, speed and duplex settings are | |
381 | read-only. If autonegotation is disabled, speed and duplex settings are writable | |
382 | if the driver supports multiple link modes.</para> | |
383 | </listitem> | |
384 | </varlistentry> | |
798d3a52 ZJS |
385 | <varlistentry> |
386 | <term><varname>WakeOnLan=</varname></term> | |
387 | <listitem> | |
388 | <para>The Wake-on-LAN policy to set for the device. The | |
389 | supported values are:</para> | |
1ff28eae | 390 | |
798d3a52 ZJS |
391 | <variablelist> |
392 | <varlistentry> | |
393 | <term><literal>phy</literal></term> | |
394 | <listitem> | |
395 | <para>Wake on PHY activity.</para> | |
396 | </listitem> | |
397 | </varlistentry> | |
617da14c SS |
398 | <varlistentry> |
399 | <term><literal>unicast</literal></term> | |
400 | <listitem> | |
401 | <para>Wake on unicast messages.</para> | |
402 | </listitem> | |
403 | </varlistentry> | |
404 | <varlistentry> | |
405 | <term><literal>multicast</literal></term> | |
406 | <listitem> | |
407 | <para>Wake on multicast messages.</para> | |
408 | </listitem> | |
409 | </varlistentry> | |
410 | <varlistentry> | |
411 | <term><literal>broadcast</literal></term> | |
412 | <listitem> | |
413 | <para>Wake on broadcast messages.</para> | |
414 | </listitem> | |
415 | </varlistentry> | |
416 | <varlistentry> | |
417 | <term><literal>arp</literal></term> | |
418 | <listitem> | |
419 | <para>Wake on ARP.</para> | |
420 | </listitem> | |
421 | </varlistentry> | |
798d3a52 ZJS |
422 | <varlistentry> |
423 | <term><literal>magic</literal></term> | |
424 | <listitem> | |
425 | <para>Wake on receipt of a magic packet. | |
426 | </para> | |
427 | </listitem> | |
428 | </varlistentry> | |
617da14c SS |
429 | <varlistentry> |
430 | <term><literal>secureon</literal></term> | |
431 | <listitem> | |
432 | <para>Enable secureon(tm) password for MagicPacket(tm). | |
433 | </para> | |
434 | </listitem> | |
435 | </varlistentry> | |
798d3a52 ZJS |
436 | <varlistentry> |
437 | <term><literal>off</literal></term> | |
438 | <listitem> | |
439 | <para>Never wake.</para> | |
440 | </listitem> | |
441 | </varlistentry> | |
442 | </variablelist> | |
c605bd00 ZJS |
443 | |
444 | <para>Defaults to <literal>off</literal>.</para> | |
798d3a52 ZJS |
445 | </listitem> |
446 | </varlistentry> | |
593022fa SS |
447 | <varlistentry> |
448 | <term><varname>Port=</varname></term> | |
449 | <listitem> | |
450 | <para>The port option is used to select the device port. The | |
451 | supported values are:</para> | |
452 | ||
453 | <variablelist> | |
454 | <varlistentry> | |
455 | <term><literal>tp</literal></term> | |
456 | <listitem> | |
457 | <para>An Ethernet interface using Twisted-Pair cable as the medium.</para> | |
458 | </listitem> | |
459 | </varlistentry> | |
460 | <varlistentry> | |
461 | <term><literal>aui</literal></term> | |
462 | <listitem> | |
463 | <para>Attachment Unit Interface (AUI). Normally used with hubs. | |
464 | </para> | |
465 | </listitem> | |
466 | </varlistentry> | |
467 | <varlistentry> | |
468 | <term><literal>bnc</literal></term> | |
469 | <listitem> | |
470 | <para>An Ethernet interface using BNC connectors and co-axial cable.</para> | |
471 | </listitem> | |
472 | </varlistentry> | |
473 | <varlistentry> | |
474 | <term><literal>mii</literal></term> | |
475 | <listitem> | |
476 | <para>An Ethernet interface using a Media Independent Interface (MII).</para> | |
477 | </listitem> | |
478 | </varlistentry> | |
479 | <varlistentry> | |
480 | <term><literal>fibre</literal></term> | |
481 | <listitem> | |
482 | <para>An Ethernet interface using Optical Fibre as the medium.</para> | |
483 | </listitem> | |
484 | </varlistentry> | |
485 | </variablelist> | |
486 | </listitem> | |
487 | </varlistentry> | |
50725d10 SS |
488 | <varlistentry> |
489 | <term><varname>TCPSegmentationOffload=</varname></term> | |
490 | <listitem> | |
491 | <para>The TCP Segmentation Offload (TSO) when true enables | |
492 | TCP segmentation offload. Takes a boolean value. | |
493 | Defaults to "unset".</para> | |
494 | </listitem> | |
ffa69a04 SS |
495 | </varlistentry> |
496 | <varlistentry> | |
497 | <term><varname>TCP6SegmentationOffload=</varname></term> | |
498 | <listitem> | |
499 | <para>The TCP6 Segmentation Offload (tx-tcp6-segmentation) when true enables | |
500 | TCP6 segmentation offload. Takes a boolean value. | |
501 | Defaults to "unset".</para> | |
502 | </listitem> | |
50725d10 SS |
503 | </varlistentry> |
504 | <varlistentry> | |
505 | <term><varname>GenericSegmentationOffload=</varname></term> | |
506 | <listitem> | |
507 | <para>The Generic Segmentation Offload (GSO) when true enables | |
508 | generic segmentation offload. Takes a boolean value. | |
509 | Defaults to "unset".</para> | |
510 | </listitem> | |
511 | </varlistentry> | |
f7ea90fb SS |
512 | <varlistentry> |
513 | <term><varname>GenericReceiveOffload=</varname></term> | |
514 | <listitem> | |
515 | <para>The Generic Receive Offload (GRO) when true enables | |
516 | generic receive offload. Takes a boolean value. | |
517 | Defaults to "unset".</para> | |
518 | </listitem> | |
519 | </varlistentry> | |
520 | <varlistentry> | |
521 | <term><varname>LargeReceiveOffload=</varname></term> | |
522 | <listitem> | |
523 | <para>The Large Receive Offload (LRO) when true enables | |
524 | large receive offload. Takes a boolean value. | |
525 | Defaults to "unset".</para> | |
526 | </listitem> | |
527 | </varlistentry> | |
5f945202 SS |
528 | <varlistentry> |
529 | <term><varname>RxChannels=</varname></term> | |
530 | <listitem> | |
531 | <para>Sets the number of receive channels (a number between 1 and 4294967295) .</para> | |
532 | </listitem> | |
533 | </varlistentry> | |
534 | <varlistentry> | |
535 | <term><varname>TxChannels=</varname></term> | |
536 | <listitem> | |
537 | <para>Sets the number of transmit channels (a number between 1 and 4294967295).</para> | |
538 | </listitem> | |
539 | </varlistentry> | |
540 | <varlistentry> | |
541 | <term><varname>OtherChannels=</varname></term> | |
542 | <listitem> | |
543 | <para>Sets the number of other channels (a number between 1 and 4294967295).</para> | |
544 | </listitem> | |
545 | </varlistentry> | |
546 | <varlistentry> | |
547 | <term><varname>CombinedChannels=</varname></term> | |
548 | <listitem> | |
549 | <para>Sets the number of combined set channels (a number between 1 and 4294967295).</para> | |
550 | </listitem> | |
551 | </varlistentry> | |
798d3a52 ZJS |
552 | </variablelist> |
553 | </refsect1> | |
1ff28eae | 554 | |
798d3a52 | 555 | <refsect1> |
b97e7fab LP |
556 | <title>Examples</title> |
557 | ||
558 | <example> | |
559 | <title>/usr/lib/systemd/network/99-default.link</title> | |
560 | ||
561 | <para>The link file <filename>99-default.link</filename> that is | |
562 | shipped with systemd defines the default naming policy for | |
563 | links.</para> | |
564 | ||
565 | <programlisting>[Link] | |
566 | NamePolicy=kernel database onboard slot path | |
567 | MACAddressPolicy=persistent</programlisting> | |
568 | </example> | |
569 | ||
570 | <example> | |
571 | <title>/etc/systemd/network/10-dmz.link</title> | |
572 | ||
573 | <para>This example assigns the fixed name | |
574 | <literal>dmz0</literal> to the interface with the MAC address | |
575 | 00:a0:de:63:7a:e6:</para> | |
576 | ||
577 | <programlisting>[Match] | |
578 | MACAddress=00:a0:de:63:7a:e6 | |
579 | ||
580 | [Link] | |
581 | Name=dmz0</programlisting> | |
582 | </example> | |
583 | ||
584 | <example> | |
585 | <title>/etc/systemd/network/10-internet.link</title> | |
586 | ||
587 | <para>This example assigns the fixed name | |
588 | <literal>internet0</literal> to the interface with the device | |
589 | path <literal>pci-0000:00:1a.0-*</literal>:</para> | |
590 | ||
591 | <programlisting>[Match] | |
592 | Path=pci-0000:00:1a.0-* | |
593 | ||
594 | [Link] | |
595 | Name=internet0</programlisting> | |
596 | </example> | |
597 | ||
798d3a52 | 598 | <example> |
6c1695be | 599 | <title>/etc/systemd/network/25-wireless.link</title> |
1ff28eae | 600 | |
b97e7fab LP |
601 | <para>Here's an overly complex example that shows the use of a large number of [Match] and [Link] settings.</para> |
602 | ||
798d3a52 | 603 | <programlisting>[Match] |
7abaad1a | 604 | MACAddress=12:34:56:78:9a:bc |
605 | Driver=brcmsmac | |
606 | Path=pci-0000:02:00.0-* | |
607 | Type=wlan | |
608 | Virtualization=no | |
609 | Host=my-laptop | |
610 | Architecture=x86-64 | |
1ff28eae | 611 | |
7abaad1a | 612 | [Link] |
613 | Name=wireless0 | |
614 | MTUBytes=1450 | |
615 | BitsPerSecond=10M | |
616 | WakeOnLan=magic | |
617 | MACAddress=cb:a9:87:65:43:21</programlisting> | |
798d3a52 ZJS |
618 | </example> |
619 | </refsect1> | |
1ff28eae | 620 | |
798d3a52 ZJS |
621 | <refsect1> |
622 | <title>See Also</title> | |
623 | <para> | |
624 | <citerefentry> | |
625 | <refentrytitle>systemd-udevd.service</refentrytitle><manvolnum>8</manvolnum> | |
626 | </citerefentry>, | |
627 | <citerefentry> | |
628 | <refentrytitle>udevadm</refentrytitle><manvolnum>8</manvolnum> | |
629 | </citerefentry>, | |
630 | <citerefentry> | |
631 | <refentrytitle>systemd.netdev</refentrytitle><manvolnum>5</manvolnum> | |
632 | </citerefentry>, | |
633 | <citerefentry> | |
634 | <refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum> | |
635 | </citerefentry> | |
636 | </para> | |
637 | </refsect1> | |
1ff28eae TG |
638 | |
639 | </refentry> |