>> And if the addresses used at the host are unique, it gets rid of many
>> of the problems caused by overlapping use of RFC 1918 addresses in IPv4.
>> There's still some issues related to traceability of traffic over the
>> network, but maybe those are manageable.
>>     
>
> The source and destination address are globally unique. As such you know
> where the traffic comes from as all these prefixes are correctly
> registered in whois. This means that an end-site organization might have
> 5 /48's in whois: one they use for "ID", this can be a special block
> like ULA, PI or just a block they get from one of their upstream ISPs,
> and maybe 4 from their upstream ISPs. 
I am fairly convinced, however, that the more address prefixes a site
has above some small number, the slower and less reliable applications
will be.

Keith


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