[conspire] Public Interest Registry uses rate-limited whois on .org: Grrr!
rick at linuxmafia.com
Tue Jul 3 12:08:40 PDT 2007
Quoting Ryan Russell (ryan at thievco.com):
> It's most likely intended to limit email address harvesting rather than
> a concern over denial of service.
Yeah, good point. Thanks. (They rate-limit queries at the Web
interface in a similar fashion, with a less severe limit.)
The address-harvesting bots, to be economically viable, have to
pull in a _lot_ of addresses during their runs. So, somewhat smarter
than a per-IP limit of four queries per minute might be a per-IP cap on
total number of queries within a single day or half-day, regardless of
rate. E.g., cut off an IP for a day or two whenever it reaches a
thousand queries within a twelve-hour period, or such -- which would
ruin the address-harvesters' strategy without interfering so much with
legitimate scripted queries. But that would be more difficult to code,
and I'm guessing they went for the quick and easy limit.
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