I'm using an R1 router with the ZyXEL C3000Z DSL modem (CenturyLink).
This is what my Xbox One lists under Current Network Status:
NAT Type: Moderate
Double NAT detected
I've forwarded all necessary ports and I've placed the console into DMZ mode to no avail. I'm at a bit of a loss at what to do. If anyone has any suggestions, I'd love to hear them.