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 From:  Chris Buechler <cbuechler at gmail dot com>
 Cc:  m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall] Forwarding PPTP vpn clients to a W2k3 server
 Date:  Mon, 7 Nov 2005 23:41:27 -0500
On 11/7/05, James W. McKeand <james at mckeand dot biz> wrote:
> >
> > You don't forward GRE, it is a protocol (47).   Perhaps enabling
> > "support" for Protocol 47 is what the "Forward PPTP Clients..."
> > feature does?
> Yes, I think that is what it does. I don't believe there is a mechanism
> in the WebGUI to "forward" or allow the GRE protocol on a inbound NAT
> rule.

Yeah, you can only forward TCP and UDP protocols with ipnat.  GRE is
another protocol all together.  That's why the "redirect incoming PPTP
connections to" option exists on the PPTP page, to use a PPTP server
that's behind NAT.