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Managing Serial Networks Using UUCP and PPP in Oracle Solaris 11.1     Oracle Solaris 11.1 Information Library
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Document Information

Preface

1.  Solaris PPP 4.0 (Overview)

2.  Planning for the PPP Link (Tasks)

3.  Setting Up a Dial-up PPP Link (Tasks)

4.  Setting Up a Leased-Line PPP Link (Tasks)

5.  Setting Up PPP Authentication (Tasks)

6.  Setting Up a PPPoE Tunnel (Tasks)

7.  Fixing Common PPP Problems (Tasks)

Solving PPP Problems (Task Map)

Tools for Troubleshooting PPP

How to Obtain Diagnostic Information From pppd

How to Turn on PPP Debugging

Solving PPP-Related and PPPoE-Related Problems

How to Diagnose Network Problems

Common Network Problems That Affect PPP

How to Diagnose and Fix Communications Problems

General Communications Problems That Affect PPP

How to Diagnose Problems With the PPP Configuration

Common PPP Configuration Problems

How to Diagnose Modem Problems

How to Obtain Debugging Information for Chat Scripts

Common Chat Script Problems

How to Diagnose and Fix Serial-Line Speed Problems

How to Obtain Diagnostic Information for PPPoE

Fixing Leased-Line Problems

Diagnosing and Fixing Authentication Problems

8.  Solaris PPP 4.0 (Reference)

9.  Migrating From Asynchronous Solaris PPP to Solaris PPP 4.0 (Tasks)

10.  UUCP (Overview)

11.  Administering UUCP (Tasks)

12.  UUCP (Reference)

Index

Fixing Leased-Line Problems

The most common problem with leased lines is poor performance. In most situations, you need to work with the telephone company to fix the problem.

Table 7-6 Common Leased-Line Problems

Symptom
Problem
Solution
The link does not start.
CSU biopolar violations (CSU BPVs) can be the cause. One end of the link is set up for AMI lines. The other end is set up for ESF bit–8 zero substitute (B8Zs).
If you are in the United States or Canada, you can directly fix this problem from the menu of the CSU/DSU. Check the CSU/DSU manufacturer's documentation for details.

In other locales, the provider might be responsible for fixing CSU BPVs.
The link has poor performance.
The pppd debug output shows CRC errors when sustained traffic is on the link. Your line might have a clocking problem, caused by misconfigurations between the telephone company and your network.
Contact the telephone company to ensure that “loop clocking” is in use.

On some unstructured leased lines, you might have to supply clocking. North American users should use loop clocking.
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