IFMEDIA(4)                OpenBSD Programmer's 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 set-
     ting network interface media and media options.  The media is typically
     set using the ifconfig(8) command.

     There are currently three link types supported by ifmedia:

           IFM_ETHER  Ethernet
           IFM_TOKEN  Token Ring
           IFM_FDDI   FDDI

     The following sections describe the possible media settings for each link
     type.  Not all of these are supported by every device; refer to your de-
     vice'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 op-
     tion.  Additional names are acceptable aliases for the media type or op-
     tion.

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 on-
                      ly has meaning if the device is normally not full-du-
                      plex.  [full-duplex, fdx]

           IFM_HDX    Place the device into half-duplex mode.  This option on-
                      ly has meaning if the device is normally not half-du-
                      plex.  [half-duplex, hdx]

           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_10_T     10baseT, 10Mb/s over unshielded twisted pair, RJ45
                        connector.  [10baseT, UTP, 10UTP]

           IFM_10_2     10base2, 10Mb/s over coaxial cable, BNC connector, al-

                        so called Thinnet.  [10base2, BNC, 10BNC]

           IFM_10_5     10base5, 10Mb/s over 15-wire cables, DB15 connector,
                        also called AUI.  [10base5, AUI, 10AUI]

           IFM_100_TX   100baseTX, 100Mb/s over unshielded twisted pair, RJ45
                        connector.  [100baseTX, 100TX]

           IFM_100_FX   100baseFX, 100Mb/s over fiber optic cables.  [100base-
                        FX, 100FX]

           IFM_100_T4   100baseT4, 100Mb/s over 4-wire (category 3) unshielded
                        twisted pair, RJ45 connector.  [100baseT4, 100T4]

           IFM_100_VG   100baseVG AnyLAN.  [100baseVG, 100VG]

           IFM_100_T2   100baseT2.  [100baseT2, 100T2]

           IFM_1000_FX  1000baseFX, 1Gb/s over fiber optic cables.  [1000base-
                        FX, 1000FX]

           IFM_10_STP   10baseSTP, 10Mb/s over shielded twisted pair, DB9 con-
                        nector.  [10baseSTP, STP, 10STP]

           IFM_10_FL    10baseFL, 10Mb/s over fiber optic cables.  [10baseFL,
                        FL, 10FL]

     There are no link type-specific options defined for Ethernet.

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, SR-
                          CRT]

           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]

SEE ALSO
     netintro(4), ifconfig(8)

HISTORY
     The ifmedia interface first appeared in BSDI BSD/OS 3.0. The implementa-
     tion 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.

OpenBSD 3.0                     August 8, 1998                               3
