Wireshark-users: Re: [Wireshark-users] How to decode nested l2tp traffic?
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From: Joan <aseques@xxxxxxxxx>
Date: Thu, 22 May 2014 22:47:40 +0200
Unfortunately there is private data in that stream so I can't share it, other than this software you are saying, is there any other way to unwrap the l2tp traffic?


2014-05-22 20:13 GMT+02:00 Patrick Klos <patrick@xxxxxxxx>:
Joan wrote:
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"
I took the filter line from here http://networkingbodges.blogspot.com.es/2012/11/tshark-one-liners.html

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?

Can you share a pcap file?  I could run it through PacketView (which de-tunnels L2TP) and see if it helps??

Patrick Klos
Klos Technologies, Inc.