Rate limit URL or src IP

[Sander Klein]

Hi All,

I know this question has been asked more times, but currently I'm 
experiencing some problems with some people harvesting data from our 
websites at high rates. I would like to block them based on the URL or 
simply on src IP.

Currently I've implemented the 'Limiting the HTTP request rate' setup 
from 
http://blog.exceliance.fr/2012/02/27/use-a-load-balancer-as-a-first-row-of-defense-against-ddos/ 
which works nice, but now they also start coming in with IPv6. Can I 
modify this setup to also work with IPv6 without creating multiple 
frontends or backends?

Greets,

Sander