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 From:  Chris Buechler <cbuechler at gmail dot com>
 Cc:  m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall] VPN (PPTP) + NAT
 Date:  Wed, 10 Aug 2005 10:45:55 -0400
On 8/10/05, Homero Thomsom <homerothomsom at yahoo dot com dot ar> wrote:
> I have a Windows 2000 running VPN server (PPTP).
> I want to connect from Internet to this service, for
> that I must pass over a PC with m0n0wall.
> In m0n0wall PC I put NAT rules to redirect ports 47
> and 1723 to the Windows PC.  The rules are this:
> 
> WAN - Port:  6891 -->   LAN PC - Port:  47

It's not port 47, it's IP protocol 47 - GRE.  GRE can't be NAT'ed via
Inbound or Server NAT, hence the redirect feature on the PPTP page on
m0n0wall.  Use it.

-Chris