sdavisnz: How many households will suffer from double NAT.
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I'd say go back to the drawing board and ask for a smaller unit.
Nobody will have double NAT. The ONT doesn't function any differently to the existing 200/300 series ONT.
NZ is a pretty small customer.. At a period where there are massive supply chain issues (which is what is driving this change) a redesign may not even be an option.