lat_manual_setup(7)lat_manual_setup(7)NAMElat_manual_setup - Describes how to manually set up the Local Area
Transport (LAT)
DESCRIPTION
To run LAT on your system, you must configure LAT in your system's ker‐
nel (see the Network Administration: Connections manual).
Optionally, you can customize your LAT setup. The customization section
of the Network Administration: Connections manual includes information
on general customization, setting up printers, host-initiated connec‐
tions, the LAT/Telnet gateway, and creating your own service.
SETTING UP LAT
To set up LAT on your system manually, you must first configure your
kernel for LAT (see the Network Administration: Connections manual).
Then log in as superuser and perform the following steps: Create the
LAT device special files.
LAT supports SVR4-style and BSD-style devices. You should use
SVR4-style devices. See the Network Administration: Connections
manual for more information.
Note
You should use the latsetup utility to create SVR4-style devices
to ensure that duplicate minor numbers are not used.
You can use the mknod command to create character devices with a
major number of 5. If you create SVR4 devices manually, you
should observe the following rules: Start the SVR4 device num‐
bers at /dev/lat/620. This avoids overlapping minor numbers
from the BSD tty name space. Make the minor number of the SVR4
device the same as the name. For example, device /dev/lat/833
should have minor number 833. The following command would cre‐
ate the SVR4-style LAT device /dev/lat/833: # /usr/sbin/mknod
/dev/lat/833 c 5 833
Once you have created the SVR4-style device, check the permis‐
sions of the device to make sure they are what you desire.
You can create BSD-style devices by running the /dev/MAKEDEV
script with the LAT option. The syntax for the MAKEDEV command
with the LAT option is as follows: MAKEDEV latN
The N variable can be 0 to 38.
The /dev/MAKEDEV script creates one BSD-style LAT device special
file for each LAT terminal device. When you run the MAKEDEV
script, it creates 16 BSD-style LAT device special files, and
creates the LAT control device (/dev/streams/lat), if it has not
already been created. The MAKEDEV script requires 16 contiguous
LAT device special files to be available. (Specifying lat38
requires only 12 contiguous LAT device special files to be
available.)
For example, the following commands create a total of 32 BSD-
style LAT device special files: # cd /dev # MAKEDEV lat0 #
MAKEDEV lat1
Record the device special file information displayed by the
MAKEDEV script. The special file names vary depending on the
number of terminal devices already configured.
The following is sample output from the MAKEDEV command:
MAKEDEV: special file(s) for lat1: tty16 tty17 tty18 tty19 tty1a
tty1b tty1c tty1d tty1e tty1f tty1g tty1h tty1i tty1j tty1k
tty1l Edit the /etc/inittab file to include entries for the LAT
device special files you created. For example:
lat620:34:respawn:/usr/sbin/getty /dev/lat/620 console vt100
lat621:34:respawn:/usr/sbin/getty lat/621 console vt100
lat630:34:respawn:/usr/sbin/lattelnet lat/630 lattelnet
The second field (34) specifies the run levels at which the LAT
devices are spawned; in this example, the getty process is
spawned at either run level 3 or 4. The first entry uses an
absolute pathname for the device (/dev/lat/620). The second
uses a relative pathname (lat/621).
The previous example shows how to add entries to the /etc/init‐
tab file for SVR4 LAT devices. The following example shows
entries for BSD LAT devices:
lat16:34:respawn:/usr/sbin/getty tty16 console vt100
lat17:34:respawn:/usr/sbin/getty tty17 console vt100
lat18:34:respawn:/usr/sbin/lattelnet tty18 lattelnet18
For more information, see the inittab(4) and getty(8) reference
pages. The Network Administration: Connections manual provides
additional information on SVR4 and BSD devices. Use the follow‐
ing command to spawn the processes for the LAT device special
files that you added to the /etc/inittab file: # /sbin/init q
Create the STREAMS special file required by LAT by issuing the
following command: # /usr/sbin/strsetup -i Enable LAT automatic
startup and shutdown by using the following command: #
/usr/sbin/rcmgr set LAT_SETUP 1
When LAT automatic startup and shutdown is enabled, the
/sbin/init.d/lat file automatically starts LAT upon reaching run
level 3 and automatically stops LAT when exiting run level 3.
Start LAT by issuing the following command: # /usr/sbin/latcp -s
RELATED INFORMATION
Commands: llogin(1), netstat(1), getty(8), init(8), latcp(8), lat‐
setup(8), MAKEDEV(8), mknod(8), rcmgr(8), strsetup(8)
Files: inittab(4)
Introduction: lat_intro(7)
Network Administration: Connections, System Administration
lat_manual_setup(7)