What: /sys/class/net/<iface>/name_assign_type Date: July 2014 KernelVersion: 3.17 Contact: netdev@vger.kernel.org Description: Indicates the name assignment type. Possible values are: 1: enumerated by the kernel, possibly in an unpredictable way 2: predictably named by the kernel 3: named by userspace 4: renamed What: /sys/class/net/<iface>/addr_assign_type Date: July 2010 KernelVersion: 3.2 Contact: netdev@vger.kernel.org Description: Indicates the address assignment type. Possible values are: 0: permanent address 1: randomly generated 2: stolen from another device 3: set using dev_set_mac_address What: /sys/class/net/<iface>/addr_len Date: April 2005 KernelVersion: 2.6.12 Contact: netdev@vger.kernel.org Description: Indicates the hardware address size in bytes. Values vary based on the lower-level protocol used by the interface (Ethernet, FDDI, ATM, IEEE 802.15.4...). See include/uapi/linux/if_*.h for actual values. What: /sys/class/net/<iface>/address Date: April 2005 KernelVersion: 2.6.12 Contact: netdev@vger.kernel.org Description: Hardware address currently assigned to this interface. Format is a string, e.g: 00:11:22:33:44:55 for an Ethernet MAC address. What: /sys/class/net/<bridge iface>/bridge/group_fwd_mask Date: January 2012 KernelVersion: 3.2 Contact: netdev@vger.kernel.org Description: Bitmask to allow forwarding of link local frames with address 01-80-C2-00-00-0X on a bridge device. Only values that set bits not matching BR_GROUPFWD_RESTRICTED in net/bridge/br_private.h allowed. Default value 0 does not forward any link local frames. Restricted bits: 0: 01-80-C2-00-00-00 Bridge Group Address used for STP 1: 01-80-C2-00-00-01 (MAC Control) 802.3 used for MAC PAUSE 2: 01-80-C2-00-00-02 (Link Aggregation) 802.3ad Any values not setting these bits can be used. Take special care when forwarding control frames e.g. 802.1X-PAE or LLDP. What: /sys/class/net/<iface>/broadcast Date: April 2005 KernelVersion: 2.6.12 Contact: netdev@vger.kernel.org Description: Hardware broadcast address for this interface. Format is a string, e.g: ff:ff:ff:ff:ff:ff for an Ethernet broadcast MAC address. What: /sys/class/net/<iface>/carrier Date: April 2005 KernelVersion: 2.6.12 Contact: netdev@vger.kernel.org Description: Indicates the current physical link state of the interface. Posssible values are: 0: physical link is down 1: physical link is up Note: some special devices, e.g: bonding and team drivers will allow this attribute to be written to force a link state for operating correctly and designating another fallback interface. What: /sys/class/net/<iface>/dev_id Date: April 2008 KernelVersion: 2.6.26 Contact: netdev@vger.kernel.org Description: Indicates the device unique identifier. Format is an hexadecimal value. This is used to disambiguate interfaces which might be stacked (e.g: VLAN interfaces) but still have the same MAC address as their parent device. What: /sys/class/net/<iface>/dormant Date: March 2006 KernelVersion: 2.6.17 Contact: netdev@vger.kernel.org Description: Indicates whether the interface is in dormant state. Possible values are: 0: interface is not dormant 1: interface is dormant This attribute can be used by supplicant software to signal that the device is not usable unless some supplicant-based authentication is performed (e.g: 802.1x). 'link_mode' attribute will also reflect the dormant state. What: /sys/clas/net/<iface>/duplex Date: October 2009 KernelVersion: 2.6.33 Contact: netdev@vger.kernel.org Description: Indicates the interface latest or current duplex value. Possible values are: half: half duplex full: full duplex Note: This attribute is only valid for interfaces that implement the ethtool get_settings method (mostly Ethernet). What: /sys/class/net/<iface>/flags Date: April 2005 KernelVersion: 2.6.12 Contact: netdev@vger.kernel.org Description: Indicates the interface flags as a bitmask in hexadecimal. See include/uapi/linux/if.h for a list of all possible values and the flags semantics. What: /sys/class/net/<iface>/ifalias Date: September 2008 KernelVersion: 2.6.28 Contact: netdev@vger.kernel.org Description: Indicates/stores an interface alias name as a string. This can be used for system management purposes. What: /sys/class/net/<iface>/ifindex Date: April 2005 KernelVersion: 2.6.12 Contact: netdev@vger.kernel.org Description: Indicates the system-wide interface unique index identifier as a decimal number. This attribute is used for mapping an interface identifier to an interface name. It is used throughout the networking stack for specifying the interface specific requests/events. What: /sys/class/net/<iface>/iflink Date: April 2005 KernelVersion: 2.6.12 Contact: netdev@vger.kernel.org Description: Indicates the system-wide interface unique index identifier a the interface is linked to. Format is decimal. This attribute is used to resolve interfaces chaining, linking and stacking. Physical interfaces have the same 'ifindex' and 'iflink' values. What: /sys/class/net/<iface>/link_mode Date: March 2006 KernelVersion: 2.6.17 Contact: netdev@vger.kernel.org Description: Indicates the interface link mode, as a decimal number. This attribute should be used in conjunction with 'dormant' attribute to determine the interface usability. Possible values: 0: default link mode 1: dormant link mode What: /sys/class/net/<iface>/mtu Date: April 2005 KernelVersion: 2.6.12 Contact: netdev@vger.kernel.org Description: Indicates the interface currently configured MTU value, in bytes, and in decimal format. Specific values depends on the lower-level interface protocol used. Ethernet devices will show a 'mtu' attribute value of 1500 unless changed. What: /sys/class/net/<iface>/netdev_group Date: January 2011 KernelVersion: 2.6.39 Contact: netdev@vger.kernel.org Description: Indicates the interface network device group, as a decimal integer. Default value is 0 which corresponds to the initial network devices group. The group can be changed to affect routing decisions (see: net/ipv4/fib_rules and net/ipv6/fib6_rules.c). What: /sys/class/net/<iface>/operstate Date: March 2006 KernelVersion: 2.6.17 Contact: netdev@vger.kernel.org Description: Indicates the interface RFC2863 operational state as a string. Possible values are: "unknown", "notpresent", "down", "lowerlayerdown", "testing", "dormant", "up". What: /sys/class/net/<iface>/phys_port_id Date: July 2013 KernelVersion: 3.12 Contact: netdev@vger.kernel.org Description: Indicates the interface unique physical port identifier within the NIC, as a string. What: /sys/class/net/<iface>/phys_port_name Date: March 2015 KernelVersion: 4.0 Contact: netdev@vger.kernel.org Description: Indicates the interface physical port name within the NIC, as a string. What: /sys/class/net/<iface>/speed Date: October 2009 KernelVersion: 2.6.33 Contact: netdev@vger.kernel.org Description: Indicates the interface latest or current speed value. Value is an integer representing the link speed in Mbits/sec. Note: this attribute is only valid for interfaces that implement the ethtool get_settings method (mostly Ethernet ). What: /sys/class/net/<iface>/tx_queue_len Date: April 2005 KernelVersion: 2.6.12 Contact: netdev@vger.kernel.org Description: Indicates the interface transmit queue len in number of packets, as an integer value. Value depend on the type of interface, Ethernet network adapters have a default value of 1000 unless configured otherwise What: /sys/class/net/<iface>/type Date: April 2005 KernelVersion: 2.6.12 Contact: netdev@vger.kernel.org Description: Indicates the interface protocol type as a decimal value. See include/uapi/linux/if_arp.h for all possible values. What: /sys/class/net/<iface>/phys_switch_id Date: November 2014 KernelVersion: 3.19 Contact: netdev@vger.kernel.org Description: Indicates the unique physical switch identifier of a switch this port belongs to, as a string.