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1What: /sys/class/net/<iface>/name_assign_type
2Date: July 2014
3KernelVersion: 3.17
4Contact: netdev@vger.kernel.org
5Description:
6 Indicates the name assignment type. Possible values are:
7
8 == ==========================================================
9 1 enumerated by the kernel, possibly in an unpredictable way
10 2 predictably named by the kernel
11 3 named by userspace
12 4 renamed
13 == ==========================================================
14
15What: /sys/class/net/<iface>/addr_assign_type
16Date: July 2010
17KernelVersion: 3.2
18Contact: netdev@vger.kernel.org
19Description:
20 Indicates the address assignment type. Possible values are:
21
22 == =============================
23 0 permanent address
24 1 randomly generated
25 2 stolen from another device
26 3 set using dev_set_mac_address
27 == =============================
28
29What: /sys/class/net/<iface>/addr_len
30Date: April 2005
31KernelVersion: 2.6.12
32Contact: netdev@vger.kernel.org
33Description:
34 Indicates the hardware address size in bytes.
35 Values vary based on the lower-level protocol used by the
36 interface (Ethernet, FDDI, ATM, IEEE 802.15.4...). See
37 include/uapi/linux/if_*.h for actual values.
38
39What: /sys/class/net/<iface>/address
40Date: April 2005
41KernelVersion: 2.6.12
42Contact: netdev@vger.kernel.org
43Description:
44 Hardware address currently assigned to this interface.
45 Format is a string, e.g: 00:11:22:33:44:55 for an Ethernet MAC
46 address.
47
48What: /sys/class/net/<bridge iface>/bridge/group_fwd_mask
49Date: January 2012
50KernelVersion: 3.2
51Contact: netdev@vger.kernel.org
52Description:
53 Bitmask to allow forwarding of link local frames with address
54 01-80-C2-00-00-0X on a bridge device. Only values that set bits
55 not matching BR_GROUPFWD_RESTRICTED in net/bridge/br_private.h
56 allowed.
57 Default value 0 does not forward any link local frames.
58
59 Restricted bits:
60
61 == ========================================================
62 0 01-80-C2-00-00-00 Bridge Group Address used for STP
63 1 01-80-C2-00-00-01 (MAC Control) 802.3 used for MAC PAUSE
64 2 01-80-C2-00-00-02 (Link Aggregation) 802.3ad
65 == ========================================================
66
67 Any values not setting these bits can be used. Take special
68 care when forwarding control frames e.g. 802.1X-PAE or LLDP.
69
70What: /sys/class/net/<iface>/broadcast
71Date: April 2005
72KernelVersion: 2.6.12
73Contact: netdev@vger.kernel.org
74Description:
75 Hardware broadcast address for this interface. Format is a
76 string, e.g: ff:ff:ff:ff:ff:ff for an Ethernet broadcast MAC
77 address.
78
79What: /sys/class/net/<iface>/carrier
80Date: April 2005
81KernelVersion: 2.6.12
82Contact: netdev@vger.kernel.org
83Description:
84 Indicates the current physical link state of the interface.
85 Possible values are:
86
87 == =====================
88 0 physical link is down
89 1 physical link is up
90 == =====================
91
92 Note: some special devices, e.g: bonding and team drivers will
93 allow this attribute to be written to force a link state for
94 operating correctly and designating another fallback interface.
95
96What: /sys/class/net/<iface>/dev_id
97Date: April 2008
98KernelVersion: 2.6.26
99Contact: netdev@vger.kernel.org
100Description:
101 Indicates the device unique identifier. Format is an hexadecimal
102 value. This is used to disambiguate interfaces which might be
103 stacked (e.g: VLAN interfaces) but still have the same MAC
104 address as their parent device.
105
106What: /sys/class/net/<iface>/dev_port
107Date: February 2014
108KernelVersion: 3.15
109Contact: netdev@vger.kernel.org
110Description:
111 Indicates the port number of this network device, formatted
112 as a decimal value. Some NICs have multiple independent ports
113 on the same PCI bus, device and function. This attribute allows
114 userspace to distinguish the respective interfaces.
115
116 Note: some device drivers started to use 'dev_id' for this
117 purpose since long before 3.15 and have not adopted the new
118 attribute ever since. To query the port number, some tools look
119 exclusively at 'dev_port', while others only consult 'dev_id'.
120 If a network device has multiple client adapter ports as
121 described in the previous paragraph and does not set this
122 attribute to its port number, it's a kernel bug.
123
124What: /sys/class/net/<iface>/dormant
125Date: March 2006
126KernelVersion: 2.6.17
127Contact: netdev@vger.kernel.org
128Description:
129 Indicates whether the interface is in dormant state. Possible
130 values are:
131 0: interface is not dormant
132 1: interface is dormant
133
134 This attribute can be used by supplicant software to signal that
135 the device is not usable unless some supplicant-based
136 authentication is performed (e.g: 802.1x). 'link_mode' attribute
137 will also reflect the dormant state.
138
139What: /sys/class/net/<iface>/testing
140Date: April 2002
141KernelVersion: 5.8
142Contact: netdev@vger.kernel.org
143Description:
144 Indicates whether the interface is under test. Possible
145 values are:
146
147 == =============================
148 0 interface is not being tested
149 1 interface is being tested
150 == =============================
151
152 When an interface is under test, it cannot be expected
153 to pass packets as normal.
154
155What: /sys/class/net/<iface>/duplex
156Date: October 2009
157KernelVersion: 2.6.33
158Contact: netdev@vger.kernel.org
159Description:
160 Indicates the interface latest or current duplex value. Possible
161 values are:
162
163 ==== ===========
164 half half duplex
165 full full duplex
166 ==== ===========
167
168 Note: This attribute is only valid for interfaces that implement
169 the ethtool get_link_ksettings method (mostly Ethernet).
170
171What: /sys/class/net/<iface>/flags
172Date: April 2005
173KernelVersion: 2.6.12
174Contact: netdev@vger.kernel.org
175Description:
176 Indicates the interface flags as a bitmask in hexadecimal. See
177 include/uapi/linux/if.h for a list of all possible values and
178 the flags semantics.
179
180What: /sys/class/net/<iface>/ifalias
181Date: September 2008
182KernelVersion: 2.6.28
183Contact: netdev@vger.kernel.org
184Description:
185 Indicates/stores an interface alias name as a string. This can
186 be used for system management purposes.
187
188What: /sys/class/net/<iface>/ifindex
189Date: April 2005
190KernelVersion: 2.6.12
191Contact: netdev@vger.kernel.org
192Description:
193 Indicates the system-wide interface unique index identifier as a
194 decimal number. This attribute is used for mapping an interface
195 identifier to an interface name. It is used throughout the
196 networking stack for specifying the interface specific
197 requests/events.
198
199What: /sys/class/net/<iface>/iflink
200Date: April 2005
201KernelVersion: 2.6.12
202Contact: netdev@vger.kernel.org
203Description:
204 Indicates the system-wide interface unique index identifier a
205 the interface is linked to. Format is decimal. This attribute is
206 used to resolve interfaces chaining, linking and stacking.
207 Physical interfaces have the same 'ifindex' and 'iflink' values.
208
209What: /sys/class/net/<iface>/link_mode
210Date: March 2006
211KernelVersion: 2.6.17
212Contact: netdev@vger.kernel.org
213Description:
214 Indicates the interface link mode, as a decimal number. This
215 attribute should be used in conjunction with 'dormant' attribute
216 to determine the interface usability. Possible values:
217
218 == =================
219 0 default link mode
220 1 dormant link mode
221 == =================
222
223What: /sys/class/net/<iface>/mtu
224Date: April 2005
225KernelVersion: 2.6.12
226Contact: netdev@vger.kernel.org
227Description:
228 Indicates the interface currently configured MTU value, in
229 bytes, and in decimal format. Specific values depends on the
230 lower-level interface protocol used. Ethernet devices will show
231 a 'mtu' attribute value of 1500 unless changed.
232
233What: /sys/class/net/<iface>/netdev_group
234Date: January 2011
235KernelVersion: 2.6.39
236Contact: netdev@vger.kernel.org
237Description:
238 Indicates the interface network device group, as a decimal
239 integer. Default value is 0 which corresponds to the initial
240 network devices group. The group can be changed to affect
241 routing decisions (see: net/ipv4/fib_rules and
242 net/ipv6/fib6_rules.c).
243
244What: /sys/class/net/<iface>/operstate
245Date: March 2006
246KernelVersion: 2.6.17
247Contact: netdev@vger.kernel.org
248Description:
249 Indicates the interface RFC2863 operational state as a string.
250
251 Possible values are:
252
253 "unknown", "notpresent", "down", "lowerlayerdown", "testing",
254 "dormant", "up".
255
256What: /sys/class/net/<iface>/phys_port_id
257Date: July 2013
258KernelVersion: 3.12
259Contact: netdev@vger.kernel.org
260Description:
261 Indicates the interface unique physical port identifier within
262 the NIC, as a string.
263
264What: /sys/class/net/<iface>/phys_port_name
265Date: March 2015
266KernelVersion: 4.0
267Contact: netdev@vger.kernel.org
268Description:
269 Indicates the interface physical port name within the NIC,
270 as a string.
271
272What: /sys/class/net/<iface>/speed
273Date: October 2009
274KernelVersion: 2.6.33
275Contact: netdev@vger.kernel.org
276Description:
277 Indicates the interface latest or current speed value. Value is
278 an integer representing the link speed in Mbits/sec.
279
280 Note: this attribute is only valid for interfaces that implement
281 the ethtool get_link_ksettings method (mostly Ethernet).
282
283What: /sys/class/net/<iface>/tx_queue_len
284Date: April 2005
285KernelVersion: 2.6.12
286Contact: netdev@vger.kernel.org
287Description:
288 Indicates the interface transmit queue len in number of packets,
289 as an integer value. Value depend on the type of interface,
290 Ethernet network adapters have a default value of 1000 unless
291 configured otherwise
292
293What: /sys/class/net/<iface>/type
294Date: April 2005
295KernelVersion: 2.6.12
296Contact: netdev@vger.kernel.org
297Description:
298 Indicates the interface protocol type as a decimal value. See
299 include/uapi/linux/if_arp.h for all possible values.
300
301What: /sys/class/net/<iface>/phys_switch_id
302Date: November 2014
303KernelVersion: 3.19
304Contact: netdev@vger.kernel.org
305Description:
306 Indicates the unique physical switch identifier of a switch this
307 port belongs to, as a string.
308
309What: /sys/class/net/<iface>/phydev
310Date: May 2017
311KernelVersion: 4.13
312Contact: netdev@vger.kernel.org
313Description:
314 Symbolic link to the PHY device this network device is attached
315 to.
316
317What: /sys/class/net/<iface>/carrier_changes
318Date: Mar 2014
319KernelVersion: 3.15
320Contact: netdev@vger.kernel.org
321Description:
322 32-bit unsigned integer counting the number of times the link has
323 seen a change from UP to DOWN and vice versa
324
325What: /sys/class/net/<iface>/carrier_up_count
326Date: Jan 2018
327KernelVersion: 4.16
328Contact: netdev@vger.kernel.org
329Description:
330 32-bit unsigned integer counting the number of times the link has
331 been up
332
333What: /sys/class/net/<iface>/carrier_down_count
334Date: Jan 2018
335KernelVersion: 4.16
336Contact: netdev@vger.kernel.org
337Description:
338 32-bit unsigned integer counting the number of times the link has
339 been down
340
341What: /sys/class/net/<iface>/threaded
342Date: Jan 2021
343KernelVersion: 5.12
344Contact: netdev@vger.kernel.org
345Description:
346 Boolean value to control the threaded mode per device. User could
347 set this value to enable/disable threaded mode for all napi
348 belonging to this device, without the need to do device up/down.
349
350 Possible values:
351 == ==================================
352 0 threaded mode disabled for this dev
353 1 threaded mode enabled for this dev
354 == ==================================
1What: /sys/class/net/<iface>/name_assign_type
2Date: July 2014
3KernelVersion: 3.17
4Contact: netdev@vger.kernel.org
5Description:
6 Indicates the name assignment type. Possible values are:
7 1: enumerated by the kernel, possibly in an unpredictable way
8 2: predictably named by the kernel
9 3: named by userspace
10 4: renamed
11
12What: /sys/class/net/<iface>/addr_assign_type
13Date: July 2010
14KernelVersion: 3.2
15Contact: netdev@vger.kernel.org
16Description:
17 Indicates the address assignment type. Possible values are:
18 0: permanent address
19 1: randomly generated
20 2: stolen from another device
21 3: set using dev_set_mac_address
22
23What: /sys/class/net/<iface>/addr_len
24Date: April 2005
25KernelVersion: 2.6.12
26Contact: netdev@vger.kernel.org
27Description:
28 Indicates the hardware address size in bytes.
29 Values vary based on the lower-level protocol used by the
30 interface (Ethernet, FDDI, ATM, IEEE 802.15.4...). See
31 include/uapi/linux/if_*.h for actual values.
32
33What: /sys/class/net/<iface>/address
34Date: April 2005
35KernelVersion: 2.6.12
36Contact: netdev@vger.kernel.org
37Description:
38 Hardware address currently assigned to this interface.
39 Format is a string, e.g: 00:11:22:33:44:55 for an Ethernet MAC
40 address.
41
42What: /sys/class/net/<bridge iface>/bridge/group_fwd_mask
43Date: January 2012
44KernelVersion: 3.2
45Contact: netdev@vger.kernel.org
46Description:
47 Bitmask to allow forwarding of link local frames with address
48 01-80-C2-00-00-0X on a bridge device. Only values that set bits
49 not matching BR_GROUPFWD_RESTRICTED in net/bridge/br_private.h
50 allowed.
51 Default value 0 does not forward any link local frames.
52
53 Restricted bits:
54 0: 01-80-C2-00-00-00 Bridge Group Address used for STP
55 1: 01-80-C2-00-00-01 (MAC Control) 802.3 used for MAC PAUSE
56 2: 01-80-C2-00-00-02 (Link Aggregation) 802.3ad
57
58 Any values not setting these bits can be used. Take special
59 care when forwarding control frames e.g. 802.1X-PAE or LLDP.
60
61What: /sys/class/net/<iface>/broadcast
62Date: April 2005
63KernelVersion: 2.6.12
64Contact: netdev@vger.kernel.org
65Description:
66 Hardware broadcast address for this interface. Format is a
67 string, e.g: ff:ff:ff:ff:ff:ff for an Ethernet broadcast MAC
68 address.
69
70What: /sys/class/net/<iface>/carrier
71Date: April 2005
72KernelVersion: 2.6.12
73Contact: netdev@vger.kernel.org
74Description:
75 Indicates the current physical link state of the interface.
76 Posssible values are:
77 0: physical link is down
78 1: physical link is up
79
80 Note: some special devices, e.g: bonding and team drivers will
81 allow this attribute to be written to force a link state for
82 operating correctly and designating another fallback interface.
83
84What: /sys/class/net/<iface>/dev_id
85Date: April 2008
86KernelVersion: 2.6.26
87Contact: netdev@vger.kernel.org
88Description:
89 Indicates the device unique identifier. Format is an hexadecimal
90 value. This is used to disambiguate interfaces which might be
91 stacked (e.g: VLAN interfaces) but still have the same MAC
92 address as their parent device.
93
94What: /sys/class/net/<iface>/dev_port
95Date: February 2014
96KernelVersion: 3.15
97Contact: netdev@vger.kernel.org
98Description:
99 Indicates the port number of this network device, formatted
100 as a decimal value. Some NICs have multiple independent ports
101 on the same PCI bus, device and function. This attribute allows
102 userspace to distinguish the respective interfaces.
103
104 Note: some device drivers started to use 'dev_id' for this
105 purpose since long before 3.15 and have not adopted the new
106 attribute ever since. To query the port number, some tools look
107 exclusively at 'dev_port', while others only consult 'dev_id'.
108 If a network device has multiple client adapter ports as
109 described in the previous paragraph and does not set this
110 attribute to its port number, it's a kernel bug.
111
112What: /sys/class/net/<iface>/dormant
113Date: March 2006
114KernelVersion: 2.6.17
115Contact: netdev@vger.kernel.org
116Description:
117 Indicates whether the interface is in dormant state. Possible
118 values are:
119 0: interface is not dormant
120 1: interface is dormant
121
122 This attribute can be used by supplicant software to signal that
123 the device is not usable unless some supplicant-based
124 authentication is performed (e.g: 802.1x). 'link_mode' attribute
125 will also reflect the dormant state.
126
127What: /sys/clas/net/<iface>/duplex
128Date: October 2009
129KernelVersion: 2.6.33
130Contact: netdev@vger.kernel.org
131Description:
132 Indicates the interface latest or current duplex value. Possible
133 values are:
134 half: half duplex
135 full: full duplex
136
137 Note: This attribute is only valid for interfaces that implement
138 the ethtool get_link_ksettings method (mostly Ethernet).
139
140What: /sys/class/net/<iface>/flags
141Date: April 2005
142KernelVersion: 2.6.12
143Contact: netdev@vger.kernel.org
144Description:
145 Indicates the interface flags as a bitmask in hexadecimal. See
146 include/uapi/linux/if.h for a list of all possible values and
147 the flags semantics.
148
149What: /sys/class/net/<iface>/ifalias
150Date: September 2008
151KernelVersion: 2.6.28
152Contact: netdev@vger.kernel.org
153Description:
154 Indicates/stores an interface alias name as a string. This can
155 be used for system management purposes.
156
157What: /sys/class/net/<iface>/ifindex
158Date: April 2005
159KernelVersion: 2.6.12
160Contact: netdev@vger.kernel.org
161Description:
162 Indicates the system-wide interface unique index identifier as a
163 decimal number. This attribute is used for mapping an interface
164 identifier to an interface name. It is used throughout the
165 networking stack for specifying the interface specific
166 requests/events.
167
168What: /sys/class/net/<iface>/iflink
169Date: April 2005
170KernelVersion: 2.6.12
171Contact: netdev@vger.kernel.org
172Description:
173 Indicates the system-wide interface unique index identifier a
174 the interface is linked to. Format is decimal. This attribute is
175 used to resolve interfaces chaining, linking and stacking.
176 Physical interfaces have the same 'ifindex' and 'iflink' values.
177
178What: /sys/class/net/<iface>/link_mode
179Date: March 2006
180KernelVersion: 2.6.17
181Contact: netdev@vger.kernel.org
182Description:
183 Indicates the interface link mode, as a decimal number. This
184 attribute should be used in conjunction with 'dormant' attribute
185 to determine the interface usability. Possible values:
186 0: default link mode
187 1: dormant link mode
188
189What: /sys/class/net/<iface>/mtu
190Date: April 2005
191KernelVersion: 2.6.12
192Contact: netdev@vger.kernel.org
193Description:
194 Indicates the interface currently configured MTU value, in
195 bytes, and in decimal format. Specific values depends on the
196 lower-level interface protocol used. Ethernet devices will show
197 a 'mtu' attribute value of 1500 unless changed.
198
199What: /sys/class/net/<iface>/netdev_group
200Date: January 2011
201KernelVersion: 2.6.39
202Contact: netdev@vger.kernel.org
203Description:
204 Indicates the interface network device group, as a decimal
205 integer. Default value is 0 which corresponds to the initial
206 network devices group. The group can be changed to affect
207 routing decisions (see: net/ipv4/fib_rules and
208 net/ipv6/fib6_rules.c).
209
210What: /sys/class/net/<iface>/operstate
211Date: March 2006
212KernelVersion: 2.6.17
213Contact: netdev@vger.kernel.org
214Description:
215 Indicates the interface RFC2863 operational state as a string.
216 Possible values are:
217 "unknown", "notpresent", "down", "lowerlayerdown", "testing",
218 "dormant", "up".
219
220What: /sys/class/net/<iface>/phys_port_id
221Date: July 2013
222KernelVersion: 3.12
223Contact: netdev@vger.kernel.org
224Description:
225 Indicates the interface unique physical port identifier within
226 the NIC, as a string.
227
228What: /sys/class/net/<iface>/phys_port_name
229Date: March 2015
230KernelVersion: 4.0
231Contact: netdev@vger.kernel.org
232Description:
233 Indicates the interface physical port name within the NIC,
234 as a string.
235
236What: /sys/class/net/<iface>/speed
237Date: October 2009
238KernelVersion: 2.6.33
239Contact: netdev@vger.kernel.org
240Description:
241 Indicates the interface latest or current speed value. Value is
242 an integer representing the link speed in Mbits/sec.
243
244 Note: this attribute is only valid for interfaces that implement
245 the ethtool get_link_ksettings method (mostly Ethernet).
246
247What: /sys/class/net/<iface>/tx_queue_len
248Date: April 2005
249KernelVersion: 2.6.12
250Contact: netdev@vger.kernel.org
251Description:
252 Indicates the interface transmit queue len in number of packets,
253 as an integer value. Value depend on the type of interface,
254 Ethernet network adapters have a default value of 1000 unless
255 configured otherwise
256
257What: /sys/class/net/<iface>/type
258Date: April 2005
259KernelVersion: 2.6.12
260Contact: netdev@vger.kernel.org
261Description:
262 Indicates the interface protocol type as a decimal value. See
263 include/uapi/linux/if_arp.h for all possible values.
264
265What: /sys/class/net/<iface>/phys_switch_id
266Date: November 2014
267KernelVersion: 3.19
268Contact: netdev@vger.kernel.org
269Description:
270 Indicates the unique physical switch identifier of a switch this
271 port belongs to, as a string.
272
273What: /sys/class/net/<iface>/phydev
274Date: May 2017
275KernelVersion: 4.13
276Contact: netdev@vger.kernel.org
277Description:
278 Symbolic link to the PHY device this network device is attached
279 to.
280
281What: /sys/class/net/<iface>/carrier_changes
282Date: Mar 2014
283KernelVersion: 3.15
284Contact: netdev@vger.kernel.org
285Description:
286 32-bit unsigned integer counting the number of times the link has
287 seen a change from UP to DOWN and vice versa
288
289What: /sys/class/net/<iface>/carrier_up_count
290Date: Jan 2018
291KernelVersion: 4.16
292Contact: netdev@vger.kernel.org
293Description:
294 32-bit unsigned integer counting the number of times the link has
295 been up
296
297What: /sys/class/net/<iface>/carrier_down_count
298Date: Jan 2018
299KernelVersion: 4.16
300Contact: netdev@vger.kernel.org
301Description:
302 32-bit unsigned integer counting the number of times the link has
303 been down