[ppml] Policy Proposal: IPv6 Assignment Guidelines

On 23-aug-2007, at 1:31, Scott Leibrand wrote:

> I've heard this argument (in favor of /60 instead of /56) before,  
> and either would be fine with me, but I still don't understand why  
> renumbering from a PA /56 into a PA /48 would be any harder than  
> renumbering from a PA /48 to another provider's PA /48.

The choice isn't the one between renumbering from a /56 to a /48 vs  
a /48 to a /48, but from a /60 to a /48 vs a /56 to a /48. I think / 
60 -> /48 is a lot less painful. Once you move from a /60 to a /48  
(or skip the /60 because you know you're not a residential user in  
the first place) you won't have to renumber when you deploy more  
subnets; only when changing ISPs.