IFMEDIA(4) | Kernel Interfaces Manual | IFMEDIA(4)

# NAME

ifmedia — network interface media settings

# SYNOPSIS

#include <sys/socket.h>
#include <net/if.h>
#include <net/if_media.h>

# DESCRIPTION

The ifmedia interface provides a consistent method for querying and setting 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_ETHER
  Ethernet
IFM_TOKEN
  Token Ring
IFM_FDDI
  FDDI
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 option.

# 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. [loopback, 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, FL, 10FL]
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. [100baseFX, 100FX]
IFM_100_T4
  100BASE-T4, 100Mb/s over 4-wire (category 3) unshielded twisted pair, RJ45 connector. [100baseT4, 100T4]
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 optic cables. (long waves) [1000baseLX, 1000LX]
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_10G_LR
  10GBASE-LR, 10Gb/s over single-mode fiber optic cables. [10GbaseLR, 10GLR]

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_AUTO.
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. [DB9/4Mbit, 4STP]
IFM_TOK_STP16
  16Mb/s, shielded twisted pair, DB9 connector. [DB9/16Mbit, 16STP]
IFM_TOK_UTP4
  4Mb/s, unshielded twisted pair, RJ45 connector. [UTP/4Mbit, 4UTP]
IFM_TOK_UTP16
  16Mb/s, unshielded twisted pair, RJ45 connector. [UTP/16Mbit, 16UTP]

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, SRCRT]
IFM_TOK_ALLR
  All routes vs. single route broadcast. [AllRoutes, ALLR]

# 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. [dual-attach, das]

# 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 6Mbps. [OFDM6]
IFM_IEEE80211_OFDM9
  Orthogonal Frequency Division Multiplexing 9Mbps. [OFDM9]
IFM_IEEE80211_OFDM12
  Orthogonal Frequency Division Multiplexing 12Mbps. [OFDM12]
IFM_IEEE80211_OFDM18
  Orthogonal Frequency Division Multiplexing 18Mbps. [OFDM18]
IFM_IEEE80211_OFDM24
  Orthogonal Frequency Division Multiplexing 24Mbps. [OFDM24]
IFM_IEEE80211_OFDM36
  Orthogonal Frequency Division Multiplexing 36Mbps. [OFDM36]
IFM_IEEE80211_OFDM48
  Orthogonal Frequency Division Multiplexing 48Mbps. [OFDM48]
IFM_IEEE80211_OFDM54
  Orthogonal Frequency Division Multiplexing 54Mbps. [OFDM54]
IFM_IEEE80211_OFDM72
  Orthogonal Frequency Division Multiplexing 72Mbps. [OFDM72]

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]

# SEE ALSO

netintro(4), ifconfig(8)

# HISTORY

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 1.5.

October 7, 2006 | NetBSD 6.0