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Dial-up Fails After a 3G Cellular Interface Is Configured with a Fixed IP Address in 3G+IPSec Scenario
Fault Symptom
During IPSec configuration on a 3G cellular interface, after the 3G cellular interface is configured with a fixed IP address, dial-up fails.
Fault Analysis
The cause is that the 3G cellular interface does not support the fixed IP address. Therefore, IPSec cannot be configured on the 3G cellular interface using a fixed IP address.
Troubleshooting Procedure
- Configure a 3G cellular interface of a branch to obtain IP an address dynamically.
Configure an IPSec policy template on the headquarters router so that the headquarters router and branch gateway can perform IPSec negotiation without knowing the branch IP address.
For the detailed configuration, see Example for Configuring a Branch to Access the Internet Using a 3G Cellular Interface and Establishing an IPSec Tunnel Between Headquarters and Branch Using an IPSec Policy Template.