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System Administration Guide: Resource Management and Network Services

Fixing PPP Configuration Problems

Some PPP problems can be traced to problems in the PPP configuration files. This section contains information for isolating and fixing general configuration problems.

How to Diagnose Problems With the PPP Configuration

  1. Become superuser on the local machine.

  2. Call the remote peer with debugging turned on.


    % pppd debug call peer-name

  3. Check the resulting log for the configuration problems that are listed in the next table.

    Table 35–4 Common PPP Configuration Problems

    Symptom 

    Problem 

    Solution 

    pppd debug output contains the error message “Could not determine remote IP address.”

    The /etc/ppp/peers/peer-name file does not have an IP address for the peer. The peer does not provide an IP address for itself during link negotiation.

    Supply an IP address for the peer on the pppd command line or in /etc/ppp/peers/peer-name by using the following format:

    :10.0.0.10 

    pppd debug output shows that CCP data compression has failed and the link is dropped.

    The peers' PPP compression configurations may be in conflict.  

    Disable CCP compression by adding the noccp option to /etc/ppp/options on one of the peers.