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.

-Chris