NAT IP and Google

Royce Williams royce at
Thu May 22 16:03:03 UTC 2014

On Thu, May 22, 2014 at 7:26 AM, Derek Andrew <Derek.Andrew at> wrote:
> As others have said, Google's abuse systems are smart enough to understand
> NAT and proxies, and won't block on request volume alone.  When we
> automatically apply a block, we'll generally offer a captcha to give
> innocent users a workaround and limit the annoyance until the abuse stops
> and the block can expire
> This failed at our site. Our entire IPv4 and IPv6 addresse blocks received
> captcha after captcha after captcha, forever and ever.
> There was a link on the page to get more information, but all that got was
> another captcha.
> Normally I am 100% behind Google in everything, but sadly, this has now
> fallen to 99.8%.

I've triggered Google's CAPTCHA multiple times at home, just from
rapidly adding and removing search terms, in a couple of different
tabs, after driving down a hundred results or so.

It's been a few months, but this used to happen to me pretty regularly
if I had drive deep to find something.


More information about the NANOG mailing list