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Troubleshooting Virtual Private Networks by Mark Lewis

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Error Messages

This section explains L2TP error messages and associated solutions. Note that these error messages are visible only if VPDN logging is enabled.

Example 4-147 shows how to enable VPDN logging.

Example 4-147. Enabling VPDN Logging
CalCity_LAC#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
CalCity_LAC(config)#vpdn logging
CalCity_LAC(config)#exit
CalCity_LAC#

Note that VPDN logging is enabled by default.

%VPDN-6-AUTHENERR

This error can be seen on either the LAC or the LNS when using remote AAA to authenticate either an L2TP tunnel or remote access client (user). It indicates that the AAA server is unreachable.

To resolve this issue, ensure that the address of the AAA server is correctly configured on the LAC/LNS. ...

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