Index for Section 7

Alphabetical listing for L

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lat_intro(7)
NAME
  lat_intro, lat - Local Area Transport (LAT) support

DESCRIPTION
  The LAT protocol supports communications between host computer systems and
  terminal servers with terminals, PCs, printers, modems and other devices
  over local area networks (LAN).

  LAT software has the features required for a host to function as both a
  service node and a server node, so requests for connections can be made by
  server users and connections can be originated to other service nodes.

  The software also permits host applications to initiate connections to
  server ports, designated as application ports, to access remote devices.

  The Tru64 UNIX LAT implementation is a STREAMS-based LAT driver.

  Types of Services

  Tru64 UNIX supports the following types of LAT services:

    ·  Bound interactive services

       A bound interactive service that has specific LAT devices (ttys) bound
       to it.  When connecting to this type of service, you are always logged
       onto a tty that was bound to this service by the latcp command.

    ·  Unbound interactive services

       An unbound interactive service does not have specific LAT devices
       bound to it.  When you access an unbound interactive service, the
       service uses any available LAT devices (ttys) that have not been bound
       to any other service.

       This is the default type of service that is added when LAT is started
       or when no ttys are bound to the service. If there is only one unbound
       interactive service on the system, you cannot delete it.

    ·  Dedicated or optional services

       A dedicated or optional service is used with specialized applications,
       written especially for LAT.  The LAT/Telnet gateway is an example of a
       specialized application.

  The latcp(8) reference page provides information on the latcp commands used
  to create the different types of services.

CONFIGURATION
  To set up LAT for use on your machine, install the LAT subset, OSFLATxxx
  (where xxx is the Tru64 UNIX version number), and perform the following
  tasks:

   1.  Configure and reboot the kernel

   2.  Set up the system for LAT

   3.  Customize LAT on your system (optional)

  To do these tasks, you must log in as superuser.

  The following sections briefly explain these tasks. For more information,
  refer to the Network Administration: Connections and System Administration
  manuals.

  Kernel Configuration

  To configure the kernel for LAT, the system configuration file must contain
  the Data Link Bridge (DLPI Version 2.0 Service Class 1) option.

  For more information see the Network Administration: Connections manual.

  System Setup

  You can set up LAT on your system automatically by using the latsetup
  utility, or manually. You should use the latsetup utility to set up your
  system automatically.

  When you set up your system automatically, the latsetup utility performs
  the following functions:

    ·  Creates the LAT device special files

    ·  Adds or removes getty entries to or from the /etc/inittab file for
       incoming connections

    ·  Executes the init q command

    ·  Starts or stops LAT services

    ·  Enables or disables LAT automatic startup and shutdown

  For more information, see latsetup(8).

  If you want to set up LAT manually, refer to lat_manual_setup(7).

				     Note

       LAT is not supported over NetRAIN virtual interfaces or the adapters
       that compose NetRAIN sets.  The latsetup utility does not allow you to
       configure LAT over these interfaces, and you should not attempt to do
       so manually.

  User Customization

  You can use the latcp command to customize LAT on your system.

  When LAT automatic startup and shutdown is enabled, the /sbin/init.d/lat
  script is executed upon reaching run level 3. When this script is executed,
  it reads the /etc/latstartup.conf file (if this file exists) and executes
  the latcp commands in the file.  If the following LAT parameters have not
  been set, the /sbin/init.d/lat script starts LAT with the default values:

    ·  Node name -- The default value is the host name.

    ·  Multicast timer -- The default value is 60 seconds.

    ·  Network adapter -- The default is all network adapters connected to
       broadcast media.

    ·  Service name -- The default value is taken from the LAT node name
       parameter.

       The following parameters are set to the defaults for each service,
       unless specified:

	 -- Service description -- The default value is ``HP Tru64 UNIX
	    Version X.X LAT SERVICE.''

	 -- Rating -- The default is dynamic rating.

	 -- Group code -- The default value is 0.

    ·  Agent status -- The default is disabled.

    ·  Outgoing port groups -- The default is group 0.

    ·  Maximum number of learned services -- The default value is 100.

  You can automate your LAT customization by creating a file called
  /etc/latstartup.conf and entering your LAT customization commands in this
  file.	 For example, you can define a particular node name or add service
  names.

  For more information on how to customize your system using a
  /etc/latstartup.conf file, refer to the Network Administration: Connections
  manual and latcp(8).

				     Note

       If your system is configured with multiple network adapters, you can
       specify that the LAT protocol run over the multiple adapters, provided
       they are connected to different logical networks. If you have more
       than one network adapter connected to a logical network, you should
       use latcp to specify that the LAT protocol runs over only one adapter.
       Running LAT over more than one network adapter can cause unpredictable
       results. You can determine the adapters defined on your system by
       using the netstat -i command.

CHANGING LINE DISCIPLINES
  The Tru64 UNIX LAT implementation is a STREAMS-based tty design.  In prior
  versions of Tru64 UNIX, the LAT implementation was a clist-based tty
  design.  Therefore, the method for changing the LAT tty line discipline of
  a STREAMS-based LAT tty differs from that of a clist-based LAT tty.

  Your Tru64 UNIX LAT system is configured (through the /etc/latautopush.conf
  file) to automatically push the ldterm (POSIX line discipline) module upon
  opening a LAT terminal device (tty). When the open call completes
  successfully, the ldterm module is in place on the stream above the LAT
  driver.

  The Network Administration: Connections manual provides a sample program
  that demonstrates how terminal (tty) line disciplines are changed in a
  clist-based tty and a STREAMS tty environment.  Additionally, you can use
  the strchg command to change the STREAMS configuration of the user's
  standard input.

  For more information, see the autopush(8) and strchg(1) reference pages.

FILES
  /dev/lat/n
      Specifies the SVR4 LAT device special files.  (Where n is a number
      starting at 620 and having no upper limit.)

  /dev/ttyWX
      Specifies the BSD LAT terminal devices. (Where W is a number from 0 to
      9 and X is an alphanumeric character from 0 to 9, a lowercase a to z,
      or an uppercase character A to Z.)  LAT supports up to 620 BSD LAT
      terminal devices.

  /dev/streams/lat
      Specifies the LAT control device.

  /sbin/init.d/lat
      Specifies the LAT startup and shutdown script.

  /etc/latstartup.conf
      Specifies LAT customization commands.  If your system is a member of a
      cluster, you must create this file as a Context-Dependent Symbolic Link
      (CDSL).  See the System Administration guide for more information.

  /etc/latautopush.conf
      Sets up the system database to automatically push the ldterm STREAMS
      module on top of the LAT STREAMS driver, each time a LAT tty is opened.

  /etc/inittab
      Controls the initialization process.

  /etc/rc.config
      Specifies the system configuration file.

SEE ALSO
  Commands: llogin(1), netstat(1), strchg(1), autopush(8), init(8), latcp(8),
  latsetup(8), MAKEDEV(8), rcmgr(8), strsetup(8)

  Files: inittab(4)

  Introduction: lat_manual_setup(7)

  Network Administration: Connections, System Administration

Index for Section 7

Alphabetical listing for L

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