[Users] IPSec + L2TP VPN to MS firewall (ISA) working !

From: Cressatti, Dominique (Dominique.Cressatti_at_lansa.co.uk)
Date: Fri Nov 22 2002 - 14:36:50 CET


What am trying to say here is that I managed to successfully
establish a VPN between Linux and MS ISA (MS firewall)
which uses X509 certificates and L2TP.

Am in the process of writing an HowTo as it is fairly involved
but I'll accept a few questions and provide some help to those
who trying to do it.

However at this time since it is fairly involved, I can't
begin to explain it all in this list. Therefore I'll ask those
who trying to achieve it, to at least have followed Nat Calrson
Howto and have a "Windows road warrior" working, using
ipsec.exe.

Limitations:
It cannot be done if there is a NAT (ADSL router for example)
in the path as the IPSec implementation used by MS doesn't support
NAT-T (NAT traversal).
At the moment the Linux box act only as server therefore I have
to establish the VPN from the Windows server.

Dom
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