Urgent! Help! L2TP Client-Initiate Router-to-Router Tunnel Flappping

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I need help urgently.

I have 2 cisco routers connected back to back in my lab for testing/troubleshooting.

1 router is configured as L2TP client, the other router is configured as L2TP server.

I used L2TP version 2.

The client router is able to ping to the server router's tunnel interface.

I configured a default route on the client router "ip route Virtual-PPP1"


1) I noticed that the L2TP tunnel is flapping.

One moment it is established, the next moment it is down.

I don't think it's the physical port nor cable because prior to configuring the tunnel, I could ping continously.

Why does it flap? Is it due to the the default route being Virtual-PPP1?

2) Then I connect a laptop to the internal network of the client router.

But I can't ping from my laptop to the server router's tunnel ip address.

I did a trace route, the trace stops at the client router.

How can I make my laptop able to ping the server router's tunnel interface, and server router's internal network laptop?




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