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VPN Connection thru a 678 ADSL router

How do I configure a 678 ADSL router/Modem to pass PPTP VPN traffic. I have a VPN appliance on the inside lan and want to access it from the outside address. I used this VPN appliance on a Cable modem and it worked fine. I tried usig nat to forward tcp port 1723 but that didn't do it. I am guessing that I am having trouble with the GRE(47) protocol.

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Re: VPN Connection thru a 678 ADSL router

The default setup of the PPTP Windows client uses TCP 1723 and GRE. There are no ports associated with the GRE protocol. Thus, if you are behind a PAT device, the setup will not work. Please confirm if you have NAT Overload or PAT configured. If so, you will need to remove it.

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