I have a Vigor 2820, a single public ip address and a private 10.2.1.* network.
Using a VPN, from my 10.2.1.* network, I can connect to a 10.1.*.* network at a remote location.

What I'm trying to do is use NAT port redirection to allow connections on a certain port of my public address to be redirected to one of the 10.1.*.* machines. However, when I try to put the 10.1.x.x address in the
NAT >> Port Redirection page, I get a message saying that the private ip address in invalid, and I can't save the value.

Is this possible somehow?

I'm using firmware 3.3.2.1

Regards,
Richard