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lat_intro(7)							  lat_intro(7)

       lat_intro, lat - Local Area Transport (LAT) support

       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

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

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

   Types of Services
       Tru64 UNIX supports the following types of LAT services: Bound interac‐
       tive 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	appli‐
	      cations,	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.

       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: Configure and reboot the kernel Set up the system for
       LAT 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  informa‐
       tion,  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 man‐

   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  per‐
       forms  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).


       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  ser‐
	      vice, 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/lat‐
       startup.conf file, refer to  the	 Network  Administration:  Connections
       manual and latcp(8).


       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. Run‐
       ning 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.

       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 disci‐
       pline of a STREAMS-based LAT tty differs from that of a clist-based LAT

       Your Tru64 UNIX LAT system is  configured  (through  the	 /etc/latauto‐
       push.conf  file)	 to  automatically  push the ldterm (POSIX line disci‐
       pline) 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  pro‐
       gram  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

       Specifies  the  SVR4  LAT  device  special files.  (Where n is a number
       starting at 620 and having no upper limit.)  Specifies the BSD LAT ter‐
       minal  devices.	(Where	W is a number from 0 to 9 and X is an alphanu‐
       meric character from 0 to 9, a lowercase a to z, or an uppercase	 char‐
       acter A to Z.)  LAT supports up to 620 BSD LAT terminal devices.	 Spec‐
       ifies the LAT control device.  Specifies the LAT startup	 and  shutdown
       script.	 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.  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.  Controls the  initialization  process.	Specifies  the
       system configuration file.

       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


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