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IPs for the router need to be dynamic, i.e. allocated to the router to the Set Top Box.
You need a straight through ethernet cable (some of the Pace STBs used crossover).
You must power cycle the Set Top Box when swapping whatever is connected to it.
You should not need to clone the PC's mac address into the router. When you first browse the internet via the router you should be redirected to the ntl (virgin media) registration page.
MTU should be auto, no more than 1500