We changed our Internet connection and I'm having trouble configuring the port forwarding on the new router.
Previously we had a basic modem and a Linksys router configured to handle the port forwarding.
Now we are trying to use the ISP provided modem/router Sagemcom 2864 device.
My DC handles the RRAS function as well and has an IP address of 10.10.0.2
An ipconfig reveals that there is a PPP adapter at 10.10.0.60 with a mask of 255.255.255.255
I did not do the initial config of the network here, so I don't know all the details.
On the ISP provided device, I have configured the following port forwarding rule:
Source Port: 1723
Destination IP: 10.10.0.2
Destination Port: 1723
I used canyouseeme.org to verify that the port is visible. When users try to connect however, the Windows VPN connection sits at "Verifying user name and password..." and then fails with error 806 saying the most common cause is that the router is not configured to allow GRE.
How can I fix this?