Configuring the Point-to-Point Protocol (PPP)

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:

  1. Log in at both machines as root.

  2. Disable PPP for this serial line at both machines.

  3. Enable getty at the remote machine by executing the following command there:

    enable tty_number

  4. 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. For example:
       Direct tty1a - 9600 direct

  5. Enter the following command on the source machine: cu -l tty_number.

    Your serial line is sound if the screen displays connected 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, see ``Connecting to other computers with UUCP''.

If the serial line appears sound, go to ``Testing dedicated link connectivity'' to continue troubleshooting.
Next topic: Testing dedicated link connectivity
Previous topic: Testing remote access

© 2003 Caldera International, Inc. All rights reserved.
SCO OpenServer Release 5.0.7 -- 11 February 2003