Done all that. The Cpe now has the IP and if I check on my core router there is a route for it. But I can not ping it from outside my network. I tried with proxy arp enabled, then I can ping it from the internet. Problem then is that any trafic coming from the Cpe to the internet shows as coming from my main IP due to the masqurade rule. If I add an accept rule this does not seem to work. What now??