L2TP/IPSec

From: paul@rettersen.de
Date: 11/30/02 

From: paul@rettersen.de
Date: Sat, 30 Nov 2002 09:14:16 +0100

Hi,

i need help with a network analyzer file.
the vpn (l2tp/ipsec) works fine, but i want to know what really
happens during the traffic flow:
first step is the isakmp main mode client--> server, server--->client
and so on ( 6 times)
than the ISAKMP quick mode starts : client--> server , server -->
client (4 times)
and now - that is the "mystery" ESP from client to server (one time)
and here quick mode again four times, but server starts...
after this there are 2 ESP-packages from the server, 3 from the client
....
anyone any idea ? i have the captured file here (ethereal) - may send
it via mail !
please help, i need it because of my degree dissertation :(
may it be the information from the client about l2tp -ppp
authentication ? and why quick mode four times again ?
thanks a lot
-paul

PS VPN-Server is a ISA-Server on Windows .Net RC1 and Client is a Win
XP pro.
Maybe any traffic flow diagram ?

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