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lan_config(8)
NAME
  lan_config - Modifies low-level configuration parameters for a given LAN
  interface

SYNOPSIS
  /usr/sbin/lan_config -i interface_name [-a [0 | 1]] [-m [aui | bnc | utp |
  fiber]] [-s [10 | 100]] [-x [0 | 1]]

OPTIONS
  -i interface_name
      Changes the specified characteristics for interface_name. You must
      provide an interface name.

  -a [0|1]
      Enables (1) or disables (0) IEEE 802.3u autonegotiation. This option
      applies only to those devices that are capable of autonegotiation (for
      example, DE500-AA and DE500-BA). When enabled, the interface
      automatically negotiates the link speed (10 or 100 Mb/s) and the mode
      (half-duplex or full-duplex) with the remote interface.

      The interface initially advertises the speed and mode previously
      selected at the console level or with the -s and -x options.  The -s
      and -x options may also be specified on the same command line as the -a
      option to redefine and renegotiate the interface's capability (when
      enabled) or to force the interface at a certain configuration (when
      disabled).


				       Note

	 The interface initiates the autonegotiation process only if and when
	 it is up and running.	See ifconfig(8) for information on how the
	 interface is marked up.

  -m [aui|bnc|utp|fiber]
      Changes the type of medium.  The following table lists the supported
      types:


      _____________________________________________________________
      Type    Meaning
      _____________________________________________________________
      aui     10Base5, or thick wire
      bnc     10Base2, or ThinWire
      utp

	      10BaseT (if speed is 10 Mb/s) or 100BaseT (if speed
	      is 100 Mb/s), or twisted-pair
      fiber   100BaseFX only
      _____________________________________________________________

      On some devices, for example, DE435 and DE425, bnc selection is done by
      means of an on-board gang jumper.	 When specifying aui or bnc for these
      devices, be sure that the jumper is in the correct position.

  -s [10|100]
      Changes the medium speed, if the interface is capable of operating at
      both regular (10 Mb/s) and fast (100 Mb/s) Ethernet speeds.  The fast
      speed cannot be selected for the aui and bnc media.

  -x [1|0]
      Enables (1) or disables (0) full-duplex operation when the utp medium
      is specified.

DESCRIPTION
  The lan_config command allows you to modify the type of medium, speed, and
  mode of operation (half- or full-duplex).

  You can also use the lan_config command to enable or disable
  autonegotiation, if the underlying device has this capability.
  Autonegotiation is a hardware and software (driver) process that allows
  determination of the highest common speed and duplex (half or full)
  configuration.  The permitted combinations of speed and mode of operation
  in descending order of precedence, from the highest to the lowest, are:

  ______________________
  Speed	     Mode
  ______________________
  100 Mb/s   full-duplex
  100 Mb/s   half-duplex
  10 Mb/s    full-duplex
  10 Mb/s    half-duplex
  ______________________

  During autonegotiation, for example, if the local interface advertises that
  it is capable of 100 Mb/s half-duplex operation, it is by implication also
  capable of 10 Mb/s, full-duplex and 10 Mb/s, half-duplex operation.  If the
  remote interface advertises that it is capable of 10 Mb/s, full-duplex
  operation only, the link is established at 10 Mb/s, full-duplex.  The
  autonegotiation process can take several seconds to complete.

  The characteristics managed with the lan_config command are ordinarily set
  from the console level via the EWx0_MODE environment variable.  The
  lan_config command allows you to override this default and configure the
  interface as needed after the system is up and running.

  Modifications made with the lan_config command do not persist across
  reboots of the operating system.

  You can also use the ifconfig command to set the speed and mode (half- or
  full-duplex) either from the command line or in the /etc/rc.local file.  If
  you specify the command in the rc.local file, the command is executed each
  time the system is booted; you do not have to modify the SRM console
  environment variables.

RESTRICTIONS
  Support for the lan_config command is limited to the tu interface for this
  release of Tru64 UNIX.









EXAMPLES
   1.  To switch from aui or bnc to utp full-duplex operation on tu0, enter:
	    lan_config -i tu0 -m utp -x 1

   2.  To disable full-duplex operation on tu0, enter:
	    lan_config -i tu0 -x 0

   3.  To enable autonegotiation on tu1, limiting capability to 100 Mb/s,
       enter:
	    lan_config -i tu1 -a 1 -s 100 -x 0

   4.  To disable autonegotiation on tu1, forcing 10 Mb/s, half-duplex
       operation, enter:
	    lan_config -i tu1 -a 0 -s 10 -x 1



SEE ALSO
  Commands: ifconfig(8)

  Files: inet.local(4)

  Interfaces: tu(7)

Index for Section 8

Alphabetical listing for L

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