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 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.
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 information, refer to the Network Administration and System Administration manuals.
For more information see the Network Administration manual.
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).
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.
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 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 the 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.
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 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.
Specifies the SVR4 LAT device special files. (Where n is a number starting at 620 and having no upper limit.) 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. Specifies the LAT control device. Specifies the LAT startup and shutdown script. Specifies LAT customization commands. 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).
Network Administration , System Administration delim off