The following table describes symptoms that are related to log output from the procedure, How to Diagnose and Fix Communications Problems.
Table 21–3 General Communications Problems That Affect PPP
Symptom |
Problem |
Solution |
---|---|---|
too many Configure-Requests |
One peer cannot hear the other peer. |
Check for the following problems:
|
The pppd debug output shows that LCP starts, but higher-level protocols fail or show CRC errors. |
The asynchronous control character map (ACCM) is incorrectly set. |
Use the default-async option to set the ACCM to the standard default of FFFFFFFF. First, try to use default-async as an option to pppd on the command line. If the problem clears, then add default-async to /etc/ppp/options or to /etc/ppp/peers/peer-name after the call option. |
The pppd debug output shows that IPCP starts but terminates immediately. |
IP addresses might be incorrectly configured. |
|
The link exhibits very poor performance. |
The modem might be incorrectly configured, with flow-control configuration errors, modem setup errors, and incorrectly configured DTE rates. |
Check the modem configuration. Adjust the configuration if necessary. |