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IFMEDIA(4) NetBSD Kernel Interfaces Manual IFMEDIA(4)
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Maintained for NetBSD
by Kimmo Suominen.
Based on man-cgi by Panagiotis Christias.
ifmedia -- network interface media settings
The ifmedia interface provides a consistent method for querying and set-
ting network interface media and media options. The media is typically
set using the ifconfig(8) command.
There are currently four link types supported by ifmedia:
IFM_TOKEN Token Ring
IFM_IEEE80211 IEEE802.11 Wireless LAN
The following sections describe the possible media settings for each link
type. Not all of these are supported by every device; refer to your
device's manual page for more information.
The lists below provide the possible names of each media type or option.
The first name in the list is the canonical name of the media type or
option. Additional names are acceptable aliases for the media type or
COMMON MEDIA TYPES AND OPTIONS
The following media types are shared by all link types:
IFM_AUTO Autoselect the best media. [autoselect, auto]
IFM_MANUAL Jumper or switch on device selects media. [manual]
IFM_NONE Deselect all media. [none]
The following media options are shared by all link types:
IFM_FDX Place the device into full-duplex mode. This option
only has meaning if the device is normally not full-
duplex. [full-duplex, fdx]
IFM_HDX Place the device into half-duplex mode. This option
only has meaning if the device is normally not half-
duplex. [half-duplex, hdx]
IFM_FLOW Hardware flow control support. [flowcontrol, flow]
IFM_FLAG0 Driver-defined flag. [flag0]
IFM_FLAG1 Driver-defined flag. [flag1]
IFM_FLAG2 Driver-defined flag. [flag2]
IFM_LOOP Place the device into hardware loopback mode. [loop-
back, hw-loopback, loop]
MEDIA TYPES AND OPTIONS FOR ETHERNET
The following media types are defined for Ethernet:
IFM_HPNA_1 HomePNA 1.0, 1Mb/s. [HomePNA1, HPNA1]
IFM_10_T 10BASE-T, 10Mb/s over unshielded twisted pair, RJ45
connector. [10baseT, UTP, 10UTP]
IFM_10_2 10BASE2, 10Mb/s over coaxial cable, BNC connector,
also called Thinnet. [10base2, BNC, 10BNC]
IFM_10_5 10BASE5, 10Mb/s over 15-wire cables, DB15 connector,
also called AUI. [10base5, AUI, 10AUI]
IFM_10_STP 10BASE-STP, 10Mb/s over shielded twisted pair, DB9
connector. [10baseSTP, STP, 10STP]
IFM_10_FL 10BASE-FL, 10Mb/s over fiber optic cables. [10baseFL,
IFM_100_TX 100BASE-TX, 100Mb/s over unshielded twisted pair, RJ45
connector. [100baseTX, 100TX]
IFM_100_FX 100BASE-FX, 100Mb/s over fiber optic cables.
IFM_100_T4 100BASE-T4, 100Mb/s over 4-wire (category 3)
unshielded twisted pair, RJ45 connector. [100baseT4,
IFM_100_T2 100BASE-T2. [100baseT2, 100T2]
IFM_100_VG 100VG-AnyLAN. [100baseVG, 100VG]
IFM_1000_SX 1000BASE-SX, 1Gb/s over multi-mode fiber optic cables.
(short waves) [1000baseSX, 1000SX]
IFM_1000_LX 1000BASE-LX, 1Gb/s over single-mode fiber or multi-
mode fiber optic cables. (long waves) [1000baseLX,
1000BASE-BX10, 1Gb/s over bidirectional fiber optic
cables. (long waves) [1000BASE-BX10]
IFM_1000_CX 1000BASE-CX, 1Gb/s over shielded twisted pair.
(twinax) [1000baseCX, 1000CX]
IFM_1000_T 1000BASE-T, 1Gb/s over category 5 unshielded twisted
pair, 802.3ab, RJ45 connector. [1000baseT, 1000T]
IFM_1000_KX 1000BASE-KX, 1Gb/s backplane. [1000BASE-KX,
IFM_2500_SX 2500BASE-SX, 2.5Gb/s over multi-mode fiber optic
cables. [2500baseSX, 2500SX]
IFM_2500_T 2.5GBASE-T, 2.5Gb/s over category 5e. [2.5GBASE-T,
IFM_2500_KX 2500BASE-KX, 2.5Gb/s backplane. [2500BASE-KX,
IFM_5000_T 5GBASE-T, 5Gb/s over category 6. [5GBASE-T, 5GbaseT]
IFM_10G_CX4 10GBASE-CX4, 10Gb/s over XAUI 4-lane PCS and copper
cables. [10GbaseCX4, 10GCX4, 10GBASE-CX4]
IFM_10G_LR 10GBASE-LR, 10Gb/s over single-mode fiber optic
cables. [10GbaseLR, 10GLR]
IFM_10G_LRM 10GBASE-LR, 10Gb/s over single-mode fiber optic
IFM_10G_SR 10GBASE-SR, 10Gb/s over multi-mode fiber optic cables.
[10GbaseSR, 10GSR, 10GBASE-SR]
IFM_10G_T 10GBASE-T, 10Gb/s over unshielded twisted pair, RJ45
SFP+ direct attach, 10Gb/s over twinaxial cable.
The following media option is defined for Ethernet:
IFM_ETH_MASTER Configure a 1000BASE-T PHY as the clock master for
a 1000BASE-T link. This option has no effect
(shows current status only) if the media is
IFM_ETH_TXPAUSE Configure the device to send PAUSE (flow control)
frames. This option has no effect (shows current
status only) if the media is IFM_AUTO.
IFM_ETH_RXPAUSE Configure the device to receive PAUSE (flow
control) frames. This option has no effect (shows
current status only) if the media is IFM_AUTO.
MEDIA TYPES AND OPTIONS FOR TOKEN RING
The following media types are defined for Token Ring:
IFM_TOK_STP4 4Mb/s, shielded twisted pair, DB9 connector.
IFM_TOK_STP16 16Mb/s, shielded twisted pair, DB9 connector.
IFM_TOK_UTP4 4Mb/s, unshielded twisted pair, RJ45 connector.
IFM_TOK_UTP16 16Mb/s, unshielded twisted pair, RJ45 connector.
The following media options are defined for Token Ring:
IFM_TOK_ETR Early token release. [EarlyTokenRelease, ETR]
IFM_TOK_SRCRT Enable source routing features. [SourceRouting,
IFM_TOK_ALLR All routes vs. single route broadcast. [AllRoutes,
MEDIA TYPES AND OPTIONS FOR FDDI
The following media types are defined for FDDI:
IFM_FDDI_SMF Single-mode fiber. [Single-mode, SMF]
IFM_FDDI_MMF Multi-mode fiber. [Multi-mode, MMF]
IFM_FDDI_UTP Unshielded twisted pair, RJ45 connector. [UTP, CDDI]
The following media options are defined for FDDI:
IFM_FDDI_DA Dual-attached station vs. Single-attached station.
MEDIA TYPES AND OPTIONS FOR IEEE802.11 WIRELESS LAN
The following media types are defined for IEEE802.11 Wireless LAN:
IFM_IEEE80211_FH1 Frequency Hopping 1Mbps. [FH1]
IFM_IEEE80211_FH2 Frequency Hopping 2Mbps. [FH2]
IFM_IEEE80211_DS1 Direct Sequence 1Mbps. [DS1]
IFM_IEEE80211_DS2 Direct Sequence 2Mbps. [DS2]
IFM_IEEE80211_DS5 Direct Sequence 5Mbps. [DS5]
IFM_IEEE80211_DS11 Direct Sequence 11Mbps. [DS11]
IFM_IEEE80211_DS22 Direct Sequence 22Mbps. [DS22]
IFM_IEEE80211_OFDM6 Orthogonal Frequency Division Multiplexing
IFM_IEEE80211_OFDM9 Orthogonal Frequency Division Multiplexing
IFM_IEEE80211_OFDM12 Orthogonal Frequency Division Multiplexing
IFM_IEEE80211_OFDM18 Orthogonal Frequency Division Multiplexing
IFM_IEEE80211_OFDM24 Orthogonal Frequency Division Multiplexing
IFM_IEEE80211_OFDM36 Orthogonal Frequency Division Multiplexing
IFM_IEEE80211_OFDM48 Orthogonal Frequency Division Multiplexing
IFM_IEEE80211_OFDM54 Orthogonal Frequency Division Multiplexing
IFM_IEEE80211_OFDM72 Orthogonal Frequency Division Multiplexing
The following media options are defined for IEEE802.11 Wireless LAN:
IFM_IEEE80211_ADHOC Ad-hoc (IBSS) mode. [adhoc, ibss]
In some drivers, it may be used with the
IFM_FLAG0 [flag0] media option to specify
non-standard ad-hoc demo mode.
IFM_IEEE80211_HOSTAP Access Point mode [hostap]
IFM_IEEE80211_MONITOR Monitor mode [monitor]
IFM_IEEE80211_TURBO Turbo mode [turbo]
The ifmedia interface first appeared in BSD/OS 3.0. The implementation
that appeared in NetBSD 1.3 was written by Jonathan Stone and Jason R.
Thorpe to be compatible with the BSDI API. It has since gone through
several revisions which have extended the API while maintaining backwards
compatibility with the original API.
Support for the IEEE802.11 Wireless LAN link type was added in
NetBSD 9.3 August 3, 2018 NetBSD 9.3