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Knowledge Base

L2TP tunnel cannot be established on AR2200

Publication Date:  2013-09-26  |   Views:  105  |   Downloads:  0  |   Author:  a80026175  |   Document ID:  EKB1000034404

Contents

Issue Description

Tunnel remins down even after negotiation is initiated

Alarm Information

From the debug L2tp infromation we can see the following error:


TTCTCMCR1 L2TP/7/L2TDBG:
  Tunnel Down:
      Local  Tunnel Name:   Tunnel ID:1
      Remote Tunnel Name:XXX Tunnel ID:0
      Try Times:1   Down Reason:1

Handling Process

Easiest way to handle this kind of issue is to debug L2TP and see exactly where the process fails.
After finding the cause of this issue the easiest solution is accept all tunnel names. for this you need to run the following command:

allow l2tp virtual-template 1 --> without specifing a remote name

Root Cause

The cause of this issue is the inconsistency between the locally configured and remote tunnel name.

Suggestions

When facing L2TP or IPSec issue best practice is to debug to see where the process fails.