I am currently in the process of designing a WISP - where customers will connect their routers to the PFSense PPPoE server to get an IP - and then will be double-nat'd to get out to the internet.

There will be certain requirements where double-nat will not work for the customer, so I was wondering if it would be possible to assign an external IP direct to the customer from the PPPoE server? - obviously there would be no further NAT on the PFSense box, as the NAT would be coming from the customer router. I'm lucky enough to have a large enough block of external IP's to allow this to happen.

Many Thanks