v6 subnet size for DSL & leased line customers

Daniel Hagerty hag at linnaean.org
Sun Dec 23 18:53:41 UTC 2007

Ross Vandegrift <ross at kallisti.us> writes:

> Ahhh, thanks - that is the only thing I have ever seen that gives any
> reason for the /64 prefix.  Sadly, the document contains no
> compelling technical reasons for it - looks like it's done just so
> things are easy when generating interface IDs from ethernet addresses.

    One good guess for the rationale is to preserve the possibility of
splitting the host and network identifier namespaces, like XNS and
some others do.  Should it be deemed the way forward, the current
policy makes it slightly more of a possibility to decouple them after
the fact.

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