> 
> Why not use the highest-order 32 bits of an IPv6 address for
> interdomain routing... i.e., "overlay" them on IPv4 addresses
> and/or a 32-bit ASN?  Yes, it smells of classful routing.  Call
> me shortsighted, but how many billion interdomain routing
> policies do we really need?
> 

One word; multihoming.

Pete

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