On Tue, 01 Feb 2011 17:37:55 PST, Bill Stewart said: > A typical home user will have a /56 of GUA, or maybe a /48 with some > ISPs. Anybody who knows enough to figure out how to set a ULA can > figure out a /64 from their GUA space that's not being auto-assigned > by one of their various home routers. So if that's the way you want > to do things, it won't cost you or your ISP anything.
Your local home network topology may not allow easy choice of a /64, if you have multiple actual subnets - if it all fit into one /64, why did you need/want that /56 or /48 in the first place?)
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