Verifying integrity of a dedicated serial line
For PPP to run over a dedicated serial line, check the line
itself and its connections at each end:
Test the serial line as follows if the line connections appear sound but
the problem still appears to be in the line. This procedure requires that:
Verify the soundness of the line connections.
Verify that the local and remote systems on the connection
are set to use the same data transfer speed.
For the local SCO OpenServer system, check the value of the speed
parameter for the endpoint in the /etc/ppphosts file.
For the remote system, check the data transfer speed setting in
its endpoint configuration.
You have access to the remote system.
The remote system is running the UNIX operating system.
If the serial line appears sound,
``Testing dedicated link connectivity''
to continue troubleshooting.
Log in at both machines as root.
Disable PPP for this serial line at both machines.
Enable getty at the remote machine
by executing the following command there:
At the local machine, edit the file /usr/lib/uucp/Devices
to be sure that the tty port for the serial line being used
is configured for direct access and both systems specify the same speed.
Direct tty1a - 9600 direct
Enter the following
command on the source machine:
cu -l tty_number.
Your serial line is sound if the screen displays
and the login prompt appears.
Type ~. at the beginning
of a line to exit the cu program.
If there is no response, the problem probably lies with the cable. Check
the cable's connections or try another cable. If an error message appears,
``Connecting to other computers with UUCP''.
Testing dedicated link connectivity
Testing remote access
© 2003 Caldera International, Inc. All rights reserved.
SCO OpenServer Release 5.0.7 -- 11 February 2003