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>/dormant 95Date: March 2006 96KernelVersion: 2.6.17 97Contact: netdev@vger.kernel.org 98Description: 99 Indicates whether the interface is in dormant state. Possible 100 values are: 101 0: interface is not dormant 102 1: interface is dormant 103 104 This attribute can be used by supplicant software to signal that 105 the device is not usable unless some supplicant-based 106 authentication is performed (e.g: 802.1x). 'link_mode' attribute 107 will also reflect the dormant state. 108 109What: /sys/clas/net/<iface>/duplex 110Date: October 2009 111KernelVersion: 2.6.33 112Contact: netdev@vger.kernel.org 113Description: 114 Indicates the interface latest or current duplex value. Possible 115 values are: 116 half: half duplex 117 full: full duplex 118 119 Note: This attribute is only valid for interfaces that implement 120 the ethtool get_settings method (mostly Ethernet). 121 122What: /sys/class/net/<iface>/flags 123Date: April 2005 124KernelVersion: 2.6.12 125Contact: netdev@vger.kernel.org 126Description: 127 Indicates the interface flags as a bitmask in hexadecimal. See 128 include/uapi/linux/if.h for a list of all possible values and 129 the flags semantics. 130 131What: /sys/class/net/<iface>/ifalias 132Date: September 2008 133KernelVersion: 2.6.28 134Contact: netdev@vger.kernel.org 135Description: 136 Indicates/stores an interface alias name as a string. This can 137 be used for system management purposes. 138 139What: /sys/class/net/<iface>/ifindex 140Date: April 2005 141KernelVersion: 2.6.12 142Contact: netdev@vger.kernel.org 143Description: 144 Indicates the system-wide interface unique index identifier as a 145 decimal number. This attribute is used for mapping an interface 146 identifier to an interface name. It is used throughout the 147 networking stack for specifying the interface specific 148 requests/events. 149 150What: /sys/class/net/<iface>/iflink 151Date: April 2005 152KernelVersion: 2.6.12 153Contact: netdev@vger.kernel.org 154Description: 155 Indicates the system-wide interface unique index identifier a 156 the interface is linked to. Format is decimal. This attribute is 157 used to resolve interfaces chaining, linking and stacking. 158 Physical interfaces have the same 'ifindex' and 'iflink' values. 159 160What: /sys/class/net/<iface>/link_mode 161Date: March 2006 162KernelVersion: 2.6.17 163Contact: netdev@vger.kernel.org 164Description: 165 Indicates the interface link mode, as a decimal number. This 166 attribute should be used in conjunction with 'dormant' attribute 167 to determine the interface usability. Possible values: 168 0: default link mode 169 1: dormant link mode 170 171What: /sys/class/net/<iface>/mtu 172Date: April 2005 173KernelVersion: 2.6.12 174Contact: netdev@vger.kernel.org 175Description: 176 Indicates the interface currently configured MTU value, in 177 bytes, and in decimal format. Specific values depends on the 178 lower-level interface protocol used. Ethernet devices will show 179 a 'mtu' attribute value of 1500 unless changed. 180 181What: /sys/class/net/<iface>/netdev_group 182Date: January 2011 183KernelVersion: 2.6.39 184Contact: netdev@vger.kernel.org 185Description: 186 Indicates the interface network device group, as a decimal 187 integer. Default value is 0 which corresponds to the initial 188 network devices group. The group can be changed to affect 189 routing decisions (see: net/ipv4/fib_rules and 190 net/ipv6/fib6_rules.c). 191 192What: /sys/class/net/<iface>/operstate 193Date: March 2006 194KernelVersion: 2.6.17 195Contact: netdev@vger.kernel.org 196Description: 197 Indicates the interface RFC2863 operational state as a string. 198 Possible values are: 199 "unknown", "notpresent", "down", "lowerlayerdown", "testing", 200 "dormant", "up". 201 202What: /sys/class/net/<iface>/phys_port_id 203Date: July 2013 204KernelVersion: 3.12 205Contact: netdev@vger.kernel.org 206Description: 207 Indicates the interface unique physical port identifier within 208 the NIC, as a string. 209 210What: /sys/class/net/<iface>/phys_port_name 211Date: March 2015 212KernelVersion: 4.0 213Contact: netdev@vger.kernel.org 214Description: 215 Indicates the interface physical port name within the NIC, 216 as a string. 217 218What: /sys/class/net/<iface>/speed 219Date: October 2009 220KernelVersion: 2.6.33 221Contact: netdev@vger.kernel.org 222Description: 223 Indicates the interface latest or current speed value. Value is 224 an integer representing the link speed in Mbits/sec. 225 226 Note: this attribute is only valid for interfaces that implement 227 the ethtool get_settings method (mostly Ethernet ). 228 229What: /sys/class/net/<iface>/tx_queue_len 230Date: April 2005 231KernelVersion: 2.6.12 232Contact: netdev@vger.kernel.org 233Description: 234 Indicates the interface transmit queue len in number of packets, 235 as an integer value. Value depend on the type of interface, 236 Ethernet network adapters have a default value of 1000 unless 237 configured otherwise 238 239What: /sys/class/net/<iface>/type 240Date: April 2005 241KernelVersion: 2.6.12 242Contact: netdev@vger.kernel.org 243Description: 244 Indicates the interface protocol type as a decimal value. See 245 include/uapi/linux/if_arp.h for all possible values. 246 247What: /sys/class/net/<iface>/phys_switch_id 248Date: November 2014 249KernelVersion: 3.19 250Contact: netdev@vger.kernel.org 251Description: 252 Indicates the unique physical switch identifier of a switch this 253 port belongs to, as a string. 254 255What: /sys/class/net/<iface>/phydev 256Date: May 2017 257KernelVersion: 4.13 258Contact: netdev@vger.kernel.org 259Description: 260 Symbolic link to the PHY device this network device is attached 261 to. 262