Also, because of the setting DEMAND=yes, a dial-up connection attempt is
made any time traffic tries to use your dial-up connection. With IDLETIMEOUT set to 600, the
connection is dropped after 600 seconds (10 minutes) with no traffic on the connection. With
RETRYTIMEOUT set to 30, a dropped connection is retried after 30 seconds (unless the connection
was dropped by an idle timeout, in which case there is no retry). You can change the timeout values
as it suits you.
Because it can take a bit of time for dial-up connections to be established, operations
may fail while dialing occurs. In particular, DNS requests can time out in 30 seconds,
which may not be long enough to establish a dial-up connection. If you have three DNS servers configured
for each client, you have a 90-second timeout period. As a result, the modem connection may
be running before the request fails.
Checking Your PPP Connection
To debug your PPP connection or simply to better understand how it works, you can run through
the steps that appear in the following sections. They will help you understand where information is
being stored and how tools can be used to track this information.
Checking That Your Modem Was Detected
It is possible that your modem is not supported under Linux.
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