> Multiply times the number of databases you want to use, times 
> the number of times you would need to download them each day 

The size remains nearly the same.
24 hourly little diff files = 1 daily diff file


> to stay current, times the number of people that want to 
> download the files--have you got a spare OC-3 laying around...?

No. If the file is shared from a single point it can be DDOSed even if
you have 3 OC-3s. The point is to push this data into a P2P network. Do
you know how much Terabytes of data any day will be transfered only by
mp3 and mpg exchange? It's not one single user who provides Madonna's
last song.  ;-)

Maybe the total traffic will increase because I will download (and in a
P2P network also share) data that I never need, simply because my server
doesn't receive any message from all this blacklisted Ips.

But on the other side I will transfer any IP only one time if added and
one time if removed and this in a zipped format. At them moment I will
create traffic for every single message containing not only the IP but
also a unique identifier pointing to the regarding DNS server.
(Ip.ad.dr.es.dnsserver.provider.com) Don't talk about traffic overhead
for thousands of small IP packets.

Maybe I'm missing something and you're right. 

Would be interresting to invite someone like Bill Larson from compu.net
who has send out this week an anouncement about his conseqences due the
the high DDOS attack risk that IP blacklist providers run into last
weeks.
I'm sure he can say something about traffic volume, daily changed
records and so on. 

Markus


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