"Oh, I don't think that all Brazilians are hackers." Let talk only about the one million users that I know, I have no data about the other ISP providers or modem users, of course that must be several millions. Let suppose that 0.1% of internet users are hackers, the result is 1,000 hackers ready to attack you! " :) Only that when we DO get an intrusion, we notify the ISP (along with log entries) and then, if we don't hear back from them, we block them. So far we've ended up blocking most of Brazil and a couple of ISPs in Hungary (and at least one U.S. site)." One million users from only one ISP provider, if you look at the number of IPs reserved to this provider you will find that the number of possible combinations is below one million, this means that one IP is shared by many users, so you are blocking a lot of people without any reason and this is not good is you are running a business, for the hacker there is no problem, he always can find a way to reach you.

Stupidity also evolves!