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 From:  "Lee Sharp" <leesharp at hal dash pc dot org>
 To:  <m0n0wall at lists dot m0n0 dot ch>
 Subject:  Re: [m0n0wall] PPTP VPN Newbie Question
 Date:  Tue, 18 Oct 2005 09:11:31 -0500
From: "Daniel Fabian" <mono at fabiand dot net>

> In our setup, roadwarriors need to connect to m0n0 and establish
> an encrypted connection. However the clients might be behind a
> NATing device. The documentation says with IPSec VPN that's
> not possible. Can PPTP VPN do that? And what about PPTP VPN
> security? I've never heard anything about PPTP VPNs. Could anyone
> perhaps supply me with a link?

PPTP "may" work over NAT.  However, there are problems with a lot of 
firewalls breaking GRE which is also required to make PPTP work.  Search the 
list for PPTP, Cisco, and GRE and you will get some good info.