ifmedia —
network interface media settings
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:
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.
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]
 
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 or multi-mode fiber optic
      cables. (long waves) [1000baseLX, 1000LX]
- IFM_1000_BX10
- 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, 1000baseKX]
- 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, 2500baseT]
- IFM_2500_KX
- 2500BASE-KX, 2.5Gb/s backplane. [2500BASE-KX, 2500baseKX]
- 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 cables. [10GbaseLRM]
- 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 connector.
      [10Gbase-T]
- IFM_10G_TWINAX
- SFP+ direct attach, 10Gb/s over twinaxial cable. [10Gbase-Twinax]
 
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.
 
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]
 
The following media types are defined for FDDI:
The following media options are defined for FDDI:
  - IFM_FDDI_DA
- Dual-attached station vs. Single-attached station. [dual-attach, das]
 
The following media types are defined for IEEE802.11 Wireless LAN:
The following media options are defined for IEEE802.11 Wireless
    LAN:
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.