Re: /48 micro allocations for v6 root servers, was: national security

Bill Manning wrote:
>       /35 routes are being discouraged in favor of /32 entries...
>       4,064,000,000 addresses to ensure that just one host
>       -might- have global reachability.  IMHO, a /48 is even 
>       overkill...  :)
Just wondering, as I have about IPv4 anycast allocations: why can't we
designate a block for microallocations, within which prefix length filters
aren't applied?  The number of routes in the DFZ is the same either way;
is there any technical reason why /64 or /128 prefixes, or /32 in IPv4,
can't be used?  I'm not a routing person, so apologies if this is somehow
unspeakably dumb.

-zefram