I have a standard BT ADSL connection to the internet with 5 public IP address available. The external IP address of the ADSL router (DLink 504T) takes 1 of these addresses (e.g. 81.3.25.25). I have a separate hardware firewall that sits behind the router. This setup works fine for standard internet access. The problem I have is that I need to expose the external IP address of the firewall to the internet to be able to setup a VPN connection to another site. What do I have to do to the router to make it pass through IP packets to the firewall (Symantec VPN200)?