As a workaround I recommend to use IPsec tunnel mode with NAT-T.
Windows XP's LT2P client can be configured to use tunnel mode
instead of the default transport mode.

Regards

Andreas

Jaime Vargas wrote:
> Hello, everybody;
> 
> As far as I know, there's a well-known issue with NAT-T that makes
> impossible to connect simultaneously to a VPN using L2TP over IPSec
> from two Windows clients which reside behind the same NAT box. Problem
> is, I need to offer a solution, or at least a convincing argument, for
> this exact case (other than configuring a site-to-site VPN, which is
> not deemed suitable for only two users).
> 
> My questions regarding this issue are:
> 
> a) Is the cause of this issue established?
> b) Is there any solution or workaround (involving Windows XP as the
> clients and strongSwan + l2tpns + NETKEY at the server)?
> c) If not, is a solution for this in the works, or being considered?
> 
> Thanks in advance,
> Jaime

======================================================================
Andreas Steffen                         andreas.stef...@strongswan.org
strongSwan - the Linux VPN Solution!                www.strongswan.org

Institute for Internet Technologies and Applications
University of Applied Sciences Rapperswil
CH-8640 Rapperswil (Switzerland)
===========================================================[ITA-HSR]==

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