End-to-End, Bottom-Up (or Top-Down) Troubleshooting
Troubleshooting can take many forms, but VPN technologies are particularly suited to end-to-end, bottom-up (or top-down) troubleshooting.
For example, if you are troubleshooting a compulsory mode Layer Two Tunneling Protocol (L2TP) version 2 VPN (with dial-in), the first thing to do is to confirm that remote clients' calls are being received on the L2TP Access Concentrator (LAC). Next you should confirm that Link Control Protocol (LCP) and partial authentication are being successfully completed on the LAC. Then you should confirm that L2TP tunnel and session setup is successful between the LAC and the L2TP Network Server (LNS). Finally, you can verify that PPP negotiation is successfully completed ...
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