General Communications Problems
That Affect PPP
The following table describes symptoms that are related
to log output from the procedure, How
to Diagnose and Fix Communications Problems.
Table 7-3 General
Communications Problems That Affect PPP
too many Configure-Requests
One peer cannot hear the other peer.
Check for the following problems:
The machine or modem might have faulty cabling.
The modem configuration might have incorrect bit
settings. Or, the configuration might have broken flow control.
The chat script might have failed. In this situation,
see Table 7–5.
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
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.
Check the chat script to verify whether the script
has incorrect IP addresses.
If the chat script is correct, request debug logs
for the peer, and check IP addresses in the peer logs.
The link exhibits very poor performance.
The modem might be incorrectly configured, with flow-control
configuration errors, modem setup errors, and incorrectly configured
Check the modem configuration. Adjust the configuration if