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Knowledge Base

Sometimes PC cannot Dial in Because LNS is not Configured with Mandatory Authentication

Publication Date:  2012-07-27  |   Views:  92  |   Downloads:  0  |   Author:  Ji Shaofei  |   Document ID:  EKB0000262974

Contents

Issue Description

Topology: PC------LAC(R vendor) ------LNS(R2600); 
Failure descriptions: PC can dial in normal, but it cannot dial in after a while.

Alarm Information

The debug is switched on when the user is dialing, and the fault prompt as L2TP::Error::receive invalid AVP in ICCN is found.

Handling Process

In l2tp-group, add the mandatory authentication of mandatory-lcp and the problem is solved. 
For example:
l2tp-group 1 
Default L2TP group 
allow l2tp virtual-template 1 
mandatory-lcp 
tunnel password simple XXXX

Root Cause

According to debug information, we can find that the tunnel has set up normally, but it fails to negotiate with LAC. 

Suggestions

At the beginning, configure mandatory-lcp.