Cisco 827 protocol forwarding


I'm trying to confiigure a cisco 827 to foward requests from the internet back to an internal server. I've got them working for UDP and TCP, but i was wondering how I go about setting them up for other protocols, such as 47 (gre). Computers connect via NAT to the outside world. Internally I have a PPTP VPN server which needs to be externally accessible. I've got the control line (tcp port 1723) forwarded ok, but I just need the data channel now..... Here is the config line for my control channel:

ip nat inside source static tcp 1723 interface Dialer1 1723

when i try the obvious:

ip nat inside source static 47 interface Dialer1

it crashes out saying that the '47' is invalid. is there a way to do this properly??

Thanks Mike

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