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lat_manual_setup(7)
NAME
lat_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 kernel
(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 connections, 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:
1. 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 numbers 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 create 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 permissions 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
2. 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/inittab 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.
3. Use the following command to spawn the processes for the LAT device
special files that you added to the /etc/inittab file:
# /sbin/init q
4. Create the STREAMS special file required by LAT by issuing the
following command:
# /usr/sbin/strsetup -i
5. 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.
6. Start LAT by issuing the following command:
# /usr/sbin/latcp -s
RELATED INFORMATION
Commands: llogin(1), netstat(1), getty(8), init(8), latcp(8), latsetup(8),
MAKEDEV(8), mknod(8), rcmgr(8), strsetup(8)
Files: inittab(4)
Introduction: lat_intro(7)
Network Administration: Connections, System Administration
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