We have recently moved onto Shared Band which is causing us some issues. We have a direct Ip Address Mapping which maps our External Address down to our internal address set on the router (which passes all protocols / ports down to our local IP - This is how shared band works) like so:
126.96.36.199 -> 192.168.2.50
The problem we are facing is when we create an IPsec tunnel from the router it is passing the
192.168.2.50 address instead of the external one (188.8.131.52) through the tunnel when trying to access remote desktop connections. We are using a Vigor 2820 firewall and the IPSec tunnel is a LAN to LAN setup. I have tried specifying the "WAN IP" against the IPSec connection but this doesn't seem to make any difference.
The I.T company at the other end can only see us create the tunnel and then try to connect to an RDP connection from the internal address but their firewalls are only set up to allow our external IP through.