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Symptom 2: Ping failure
The remote end cannot be pinged after the modem is connected.
Solution
To resolve the problem:
1. Use the debugging ppp all command to verify that the same link layer encapsulation is used at the
two ends and correct PPP parameters are configured for authentication.
2. Verify that a correct IP address is assigned to the dialup interface.
3. Verify that DDR is enabled on the dialup interface.
4. Verify that the correct dialer-group and dialer-group rule commands are configured and
associated to make sure the packets can pass.
5. Use the debugging dialer event and debugging dialer packet commands to locate the problem.