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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>/dev_port
Date: February 2014
KernelVersion: 3.15
Contact: netdev@vger.kernel.org
Description:
Indicates the port number of this network device, formatted
as a decimal value. Some NICs have multiple independent ports
on the same PCI bus, device and function. This attribute allows
userspace to distinguish the respective interfaces.
Note: some device drivers started to use 'dev_id' for this
purpose since long before 3.15 and have not adopted the new
attribute ever since. To query the port number, some tools look
exclusively at 'dev_port', while others only consult 'dev_id'.
If a network device has multiple client adapter ports as
described in the previous paragraph and does not set this
attribute to its port number, it's a kernel bug.
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/class/net/<iface>/testing
Date: April 2002
KernelVersion: 5.8
Contact: netdev@vger.kernel.org
Description:
Indicates whether the interface is under test. Possible
values are:
0: interface is not being tested
1: interface is being tested
When an interface is under test, it cannot be expected
to pass packets as normal.
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_link_ksettings 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_link_ksettings 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.
What: /sys/class/net/<iface>/phydev
Date: May 2017
KernelVersion: 4.13
Contact: netdev@vger.kernel.org
Description:
Symbolic link to the PHY device this network device is attached
to.
What: /sys/class/net/<iface>/carrier_changes
Date: Mar 2014
KernelVersion: 3.15
Contact: netdev@vger.kernel.org
Description:
32-bit unsigned integer counting the number of times the link has
seen a change from UP to DOWN and vice versa
What: /sys/class/net/<iface>/carrier_up_count
Date: Jan 2018
KernelVersion: 4.16
Contact: netdev@vger.kernel.org
Description:
32-bit unsigned integer counting the number of times the link has
been up
What: /sys/class/net/<iface>/carrier_down_count
Date: Jan 2018
KernelVersion: 4.16
Contact: netdev@vger.kernel.org
Description:
32-bit unsigned integer counting the number of times the link has
been down
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