L2TP services are interrupted because frequent 3G network disconnection

The reason is that 3G signals in the area where the device is located are poor, causing frequent 3G network disconnection. After the 3G disconnection, Hello packets expire. Consequently, the connection fails.
To address this issue, perform the following operations:
1. Configure track nqa. Restart the 3G module after the ping operation fails.
2. Change the interval for transmitting L2TP Hello packet to 120s.

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