On number of recursors & authorities.

> through. that said, with installations of BIND numbering into the 
> millions (i would guess), there's no shortage of expertise in BIND out 
> there.

I estimate that there are about 6 million or so recursors out there,
based on similar numbers bandied about by root server operators
occasionally.  This number struck me as low, but it is probably a good
rule of thumb. In comparison, cracker Dan Kaminsky reported finding
500,000 open recursors in 2005 at a cracker conference. A recursor
attack was reported a few months later 2006 in which most recursors were
not actually open, but were 'half open'; that is, they were open enough
to participate in the attack, but were not open when tested remotely by
the people monitoring the attack.

The number authorities can probably be calculated pretty closely by
looking at the TLD and CC zone files, but I'm not aware that those
operators publish those numbers, or the zone files.

		--Dean

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