Am contemplating switching to a new ISP for Fibre and been reading up as much as I can on their service. By accident I came across a few posts on the ISP info boards that indicate that they use Carrier Grade NAT (CGN) (which I BELIEVE effectively will give you a double NAT for any public facing services. AFAIK remote access won't work with a double NAT. I see from the their info that you can set up port forwarding via DDNS but I have a feeling this will still give a double NAT and will not work the same as with an ISP that is not using CGN where port forwarding can be set on the router. I'm not sure of this but I think that even using AISs DDNS service the public facing IP address of the router will not match the IP address visible using DDNS.
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