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60f067b4 | 1 | '\" t |
5eef597e | 2 | .TH "SYSTEMD\&.LINK" "5" "" "systemd 217" "systemd.link" |
60f067b4 JS |
3 | .\" ----------------------------------------------------------------- |
4 | .\" * Define some portability stuff | |
5 | .\" ----------------------------------------------------------------- | |
6 | .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
7 | .\" http://bugs.debian.org/507673 | |
8 | .\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html | |
9 | .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
10 | .ie \n(.g .ds Aq \(aq | |
11 | .el .ds Aq ' | |
12 | .\" ----------------------------------------------------------------- | |
13 | .\" * set default formatting | |
14 | .\" ----------------------------------------------------------------- | |
15 | .\" disable hyphenation | |
16 | .nh | |
17 | .\" disable justification (adjust text to left margin only) | |
18 | .ad l | |
19 | .\" ----------------------------------------------------------------- | |
20 | .\" * MAIN CONTENT STARTS HERE * | |
21 | .\" ----------------------------------------------------------------- | |
22 | .SH "NAME" | |
23 | systemd.link \- Network device configuration | |
24 | .SH "SYNOPSIS" | |
25 | .PP | |
26 | \fIlink\fR\&.link | |
27 | .SH "DESCRIPTION" | |
28 | .PP | |
29 | Network link configuration is performed by the | |
30 | \fBnet_setup_link\fR | |
31 | udev builtin\&. | |
32 | .PP | |
33 | The link files are read from the files located in the system network directory | |
34 | /usr/lib/systemd/network, the volatile runtime network directory | |
35 | /run/systemd/network, and the local administration network directory | |
36 | /etc/systemd/network\&. Link files must have the extension | |
37 | \&.link; other extensions are ignored\&. All link files are collectively sorted and processed in lexical order, regardless of the directories in which they live\&. However, files with identical filenames replace each other\&. Files in | |
38 | /etc | |
39 | have the highest priority, files in | |
40 | /run | |
41 | take precedence over files with the same name in | |
42 | /usr/lib\&. This can be used to override a system\-supplied link file with a local file if needed; a symlink in | |
43 | /etc | |
44 | with the same name as a link file in | |
45 | /usr/lib, pointing to | |
46 | /dev/null, disables the link file entirely\&. | |
47 | .PP | |
48 | The link file contains a | |
49 | "[Match]" | |
50 | section, which determines if a given link file may be applied to a given device; and a | |
51 | "[Link]" | |
52 | section specifying how the device should be configured\&. The first (in lexical order) of the link files that matches a given device is applied\&. | |
e842803a | 53 | .SH "[MATCH] SECTION OPTIONS" |
60f067b4 JS |
54 | .PP |
55 | A link file is said to match a device if each of the entries in the | |
56 | "[Match]" | |
57 | section matches, or if the section is empty\&. The following keys are accepted: | |
58 | .PP | |
59 | \fIMACAddress=\fR | |
60 | .RS 4 | |
61 | The hardware address\&. | |
62 | .RE | |
63 | .PP | |
64 | \fIPath=\fR | |
65 | .RS 4 | |
66 | The persistent path, as exposed by the udev property | |
67 | "ID_PATH"\&. May contain shell style globs\&. | |
68 | .RE | |
69 | .PP | |
70 | \fIDriver=\fR | |
71 | .RS 4 | |
72 | The driver currently bound to the device, as exposed by the udev property | |
73 | "DRIVER" | |
74 | of its parent device, or if that is not set, the driver as exposed by | |
75 | "ethtool \-i" | |
76 | of the device itself\&. | |
77 | .RE | |
78 | .PP | |
79 | \fIType=\fR | |
80 | .RS 4 | |
81 | The device type, as exposed by the udev property | |
82 | "DEVTYPE"\&. | |
83 | .RE | |
84 | .PP | |
85 | \fIHost=\fR | |
86 | .RS 4 | |
87 | Matches against the hostname or machine ID of the host\&. See | |
88 | "ConditionHost=" | |
89 | in | |
90 | \fBsystemd.unit\fR(5) | |
91 | for details\&. | |
92 | .RE | |
93 | .PP | |
94 | \fIVirtualization=\fR | |
95 | .RS 4 | |
96 | Checks whether the system is executed in a virtualized environment and optionally test whether it is a specific implementation\&. See | |
97 | "ConditionVirtualization=" | |
98 | in | |
99 | \fBsystemd.unit\fR(5) | |
100 | for details\&. | |
101 | .RE | |
102 | .PP | |
103 | \fIKernelCommandLine=\fR | |
104 | .RS 4 | |
105 | Checks whether a specific kernel command line option is set (or if prefixed with the exclamation mark unset)\&. See | |
106 | "ConditionKernelCommandLine=" | |
107 | in | |
108 | \fBsystemd.unit\fR(5) | |
109 | for details\&. | |
110 | .RE | |
111 | .PP | |
112 | \fIArchitecture=\fR | |
113 | .RS 4 | |
114 | Checks whether the system is running on a specific architecture\&. See | |
115 | "ConditionArchitecture=" | |
116 | in | |
117 | \fBsystemd.unit\fR(5) | |
118 | for details\&. | |
119 | .RE | |
e842803a | 120 | .SH "[LINK] SECTION OPTIONS" |
60f067b4 JS |
121 | .PP |
122 | The | |
123 | "[Link]" | |
124 | section accepts the following keys: | |
125 | .PP | |
126 | \fIDescription=\fR | |
127 | .RS 4 | |
128 | A description of the device\&. | |
129 | .RE | |
130 | .PP | |
131 | \fIAlias=\fR | |
132 | .RS 4 | |
133 | The | |
134 | "ifalias" | |
135 | is set to this value\&. | |
136 | .RE | |
137 | .PP | |
138 | \fIMACAddressPolicy=\fR | |
139 | .RS 4 | |
140 | The policy by which the MAC address should be set\&. The available policies are: | |
141 | .PP | |
142 | "persistent" | |
143 | .RS 4 | |
144 | If the hardware has a persistent MAC address, as most hardware should, and if it is used by the kernel, nothing is done\&. Otherwise, a new MAC address is generated which is guaranteed to be the same on every boot for the given machine and the given device, but which is otherwise random\&. | |
145 | .RE | |
146 | .PP | |
147 | "random" | |
148 | .RS 4 | |
149 | If the kernel is using a random MAC address, nothing is done\&. Otherwise, a new address is randomly generated each time the device appears, typically at boot\&. | |
150 | .RE | |
151 | .RE | |
152 | .PP | |
153 | \fIMACAddress=\fR | |
154 | .RS 4 | |
155 | The MAC address to use, if no | |
156 | "MACAddressPolicy=" | |
157 | is specified\&. | |
158 | .RE | |
159 | .PP | |
160 | \fINamePolicy=\fR | |
161 | .RS 4 | |
162 | An ordered, space\-separated list of policies by which the interface name should be set\&. | |
163 | "NamePolicy" | |
164 | may be disabled by specifying | |
165 | "net\&.ifnames=0" | |
166 | on the kernel commandline\&. Each of the policies may fail, and the first successful one is used\&. The name is not set directly, but is exported to udev as the property | |
167 | "ID_NET_NAME", which is, by default, used by a udev rule to set | |
5eef597e MP |
168 | "NAME"\&. If the name has already been set by userspace, no renaming is performed\&. The available policies are: |
169 | .PP | |
170 | "kernel" | |
171 | .RS 4 | |
172 | If the kernel claims that the name it has set for a device is predictable, then no renaming is performed\&. | |
173 | .RE | |
60f067b4 JS |
174 | .PP |
175 | "database" | |
176 | .RS 4 | |
177 | The name is set based on entries in the udev\*(Aqs Hardware Database with the key | |
178 | "ID_NET_NAME_FROM_DATABASE"\&. | |
179 | .RE | |
180 | .PP | |
181 | "onboard" | |
182 | .RS 4 | |
183 | The name is set based on information given by the firmware for on\-board devices, as exported by the udev property | |
184 | "ID_NET_NAME_ONBOARD"\&. | |
185 | .RE | |
186 | .PP | |
187 | "slot" | |
188 | .RS 4 | |
189 | The name is set based on information given by the firmware for hot\-plug devices, as exported by the udev property | |
190 | "ID_NET_NAME_SLOT"\&. | |
191 | .RE | |
192 | .PP | |
193 | "path" | |
194 | .RS 4 | |
195 | The name is set based on the device\*(Aqs physical location, as exported by the udev property | |
196 | "ID_NET_NAME_PATH"\&. | |
197 | .RE | |
198 | .PP | |
199 | "mac" | |
200 | .RS 4 | |
201 | The name is set based on the device\*(Aqs persistent MAC address, as exported by the udev property | |
202 | "ID_NET_NAME_MAC"\&. | |
203 | .RE | |
204 | .RE | |
205 | .PP | |
206 | \fIName=\fR | |
207 | .RS 4 | |
208 | The interface name to use in case all the policies specified in | |
209 | \fINamePolicy=\fR | |
210 | fail, or in case | |
211 | \fINamePolicy=\fR | |
212 | is missing or disabled\&. | |
213 | .RE | |
214 | .PP | |
215 | \fIMTUBytes=\fR | |
216 | .RS 4 | |
217 | The maximum transmission unit in bytes to set for the device\&. The usual suffixes K, M, G, are supported and are understood to the base of 1024\&. | |
218 | .RE | |
219 | .PP | |
220 | \fIBitsPerSecond=\fR | |
221 | .RS 4 | |
222 | The speed to set for the device, the value is rounded down to the nearest Mbps\&. The usual suffixes K, M, G, are supported and are understood to the base of 1000\&. | |
223 | .RE | |
224 | .PP | |
225 | \fIDuplex=\fR | |
226 | .RS 4 | |
227 | The duplex mode to set for the device\&. The accepted values are | |
228 | "half" | |
229 | and | |
230 | "full"\&. | |
231 | .RE | |
232 | .PP | |
233 | \fIWakeOnLan=\fR | |
234 | .RS 4 | |
235 | The Wake\-on\-LAN policy to set for the device\&. The supported values are: | |
236 | .PP | |
237 | "phy" | |
238 | .RS 4 | |
239 | Wake on PHY activity\&. | |
240 | .RE | |
241 | .PP | |
242 | "magic" | |
243 | .RS 4 | |
244 | Wake on receipt of a magic packet\&. | |
245 | .RE | |
246 | .PP | |
247 | "off" | |
248 | .RS 4 | |
249 | Never wake\&. | |
250 | .RE | |
251 | .RE | |
252 | .SH "EXAMPLE" | |
253 | .PP | |
254 | \fBExample\ \&1.\ \&/etc/systemd/network/wireless.link\fR | |
255 | .sp | |
256 | .if n \{\ | |
257 | .RS 4 | |
258 | .\} | |
259 | .nf | |
260 | [Match] | |
261 | MACAddress=12:34:56:78:9a:bc | |
262 | Driver=brcmsmac | |
263 | Path=pci\-0000:02:00\&.0\-* | |
264 | Type=wlan | |
265 | Virtualization=no | |
266 | Host=my\-laptop | |
267 | Architecture=x86\-64 | |
268 | ||
269 | [Link] | |
270 | Name=wireless0 | |
271 | MTUBytes=1450 | |
272 | BitsPerSecond=10M | |
273 | WakeOnLan=magic | |
274 | MACAddress=cb:a9:87:65:43:21 | |
275 | .fi | |
276 | .if n \{\ | |
277 | .RE | |
278 | .\} | |
279 | .SH "SEE ALSO" | |
280 | .PP | |
281 | \fBsystemd-udevd.service\fR(8), | |
282 | \fBudevadm\fR(8) |