Wireshark-users: [Wireshark-users] How to decode nested l2tp traffic?
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From: Joan <aseques@xxxxxxxxx>
Date: Thu, 22 May 2014 18:31:51 +0200
I am trying to extract the data transmitted into a l2tp tunnel, I am running thsark/tcpdump in the tunnel terminator. What I am using so far is this (4291 is the tunnel number):
  tcpdump -n -i eth3.800 "udp port 1701 && udp[8:2] & 0x80ff == 0x0002 && udp[10:2] == 4291" 


The problem is that I would like to inspect the traffic inside the tunnel, but I could'nt find a reference on this.

Any clues?