Could I use a Lan address to the Wan port on a Z3.
Its for a home with detached office, the home has a BT hub, the office is the other end of a 1Gb fibre link (with converters), the Z3 will be connected to the Head Office via VPN, I don't really want to change the house kit if I can help it.
Internet -> BT Hub -> Port 1 -> House Lan
-> Port 2 -> 1Gb Fibre Converter -> FO Cable -> Finre Converter -> Z3 -> Office Lan
The office lan on a different Nat subnet, the tunnel passes via BT hub to Head office and ignores all the X boxes and iPads etc in the house